Question Pool Acid, Bases, Salts

Acid, Bases, Salts - SAMAGRA Question Pool & Answers | Class 9 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Chemistry Acid, Bases, Salts

BrainsPrep Logo


Qn 1.

Qn.

Soda water is made by dissolving carbon dioxide in water under high pressure.

 

  1. Choose the molecular formula of soda water from the following.

[ H2SO, H2CO3 , H2SO3 , HNO3 ]

 

2.What change in colour do you observe when a blue litmus paper is dipped in soda water.

3. Give reason for the colour change

 

  • Answer)
    1. H2CO3

    2. Turns red

    3. Soda water contains carbonic acid. Acid turns blue litmus red




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 2.

a) Find the odd one out

[ Na2O , MgO , SO, Al2O]

b)Write down the molecular formulae of the acid formed when the oxide in (a) gets dissolved in water.                

c) Write down the ionisation reaction of the acid obtained in (b) 

  • Answer)
    1. SO2

    2. H2SO3                            

    3. H2SO     H+ + HSO3 -                                     

       

      4. HSO3-         H+ + SO32 -   




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 3.

Molecular formulae of a few acids are given.

[ H2SO3 , H2CO3 , HNO3 , H2SO]

a)Find the odd one out.

b)Write down the ionisation equation of this acid.

  • Answer)

    a) HNO3                                                            

    b) HNO3  H+ + NO3-  




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 4.

Some water is taken in a beaker.

  1. What is the pH value of water?                  

  2. Some caustic soda is added to water taken in the beaker. Is there any change in the pH value of the resulting solution? Justify your answer.

  • Answer)
    1. 7

    2. pH value increases .

      Caustic soda is an alkali. So the resulting solution gets alkaline in nature




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 5.

Complete the table given below

 

Molecular formulae

Cation

Anion

Ca3(PO4)2

Ca2+

.....(a).....

NaCl

.....(b).....

Cl-

MgSO4

Mg2+

.....(c).....

NH4Cl

.....(d).....

Cl-

  • Answer)
    1. (PO4)3-

    2. Na+

    3. (SO4)2-

    4. NH4+




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 6.

Certain anions and cations are given in the box

Ca2+ , Cl- , NH4 , OH -

 

  1. Which are the cations among them?

  2. Write down the molecular formula of any one of the  alkalies that can be formed from these ions .

  • Answer)
    1. Ca2+ , NH4 +

    2. Ca(OH)/ NH4OH




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 7.

A few acids and alkalies are given in the box)

NaOH , Mg(OH)2 , HCl , H2SO4 , H3PO4

 

  1. Which of them is a tribasic acid ?

  2. Which acid is used to produce the salt MgSO4 ?

  3. Complete the following chemical equation.

    .....A........ + HCl           NaCl + .......B......

 

  • Answer)
    1. H3PO4                          

    2. H2SO4                           

    3. A -            Na OH                          

      B -               H2O        




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 8.

Equations given below represent the ionisations of two acids. Complete the equations.

H2CO3 .          .....P....... + CO32-

 

HNO3                H+ + ......Q.......

 

a)What are P and Q

b)Which one of them is a monobasic acid?

  • Answer)
    1. P - 2H+ / H+

      Q  -  NO3-

       

    2. HNO3




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 9.

Given below are equations of the reactions taking place when hydrochloric acid dissolves in water.

HCl H+ + Cl -

H+ + H2O     ......A.......

 

  1. What is A in this equation?   

  2. The following equations show the ionisation of H2SO4. Complete the equation.

 

H2SO4             H+ + ......B.......                        

B         H+ + ......C......                       

 

  • Answer)
    1. H3+ / Hydronium ion  

    2. B - HSO4- (Bisulphate ion‍ )   

            C - SO42- (Sulphate ion)       




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 10.

Qn.

Classify the following into acidic oxides and basic oxides.

MgO , NO2 , K2O , SO2

  • Answer)

    Acidic oxide: NO2 , SO2

    Basic oxide :  K2O , MgO 




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 11.

Given below is the equation of reaction between calcium oxide and water

CaO + H2O            ........A.........

 

  1. Identify the product A.

  2. What is the nature of A? Suggest a method to identify A.

  • Answer)
    1. Ca(OH)2 / Calcium hydroxide

    2. Alkaline nature

    3. Red litmus turns blue.




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 12.

Procedure of an experiment is given below

Take some calcium carbonate in a boiling tube. Add hydrochloric acid to it using a thistle funnel. The gas coming out is passed through water containing blue litmus solution

  1. Name the gas evolved ?

  2. Suggest a method to identify this gas

  3. What changes takes place when this gas is passed through water containing blue litmus solution . Give reason

  • Answer)
    1. CO/ Carbon dioxide

    2. Turns clear lime water milky/ A burning match stick extinguishes when introduced into the boiling tube

    3. Turns red

      shows acidic nature ( when COgets dissolved in water, carbonic acid is produced.)




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 13.

Choose the statements suitable for acids

 

  1. Have alkaline taste.

  2. Turns red litmus blue

  3. Turns blue litmus red

  4. Have sour taste

  • Answer)

    Turns blue litmus red              

    Have sour taste                             

     




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 14.

pH values of a few substances are given in the table given below. Answer the following questions

Substances

pH value

A

7

B

14

C

2

 

  1. Which one of them shows neutral nature ?

  2. Which substance among them usually react with metals to produce hydrogen gas?

  3. Name a product formed when B and C combine

  4. Identify the gas formed when the substance C reacts with carbonates ?

  • Answer)
    1. A                          

    2. C                                 

    3. H2O                                  

    4. CO2                                         

     




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 15.

pH Value of substances P,Q and R are given in the table. Answer the following questions.

 

Substance

pH value

P

2

Q

13

R

7

 

  1. Which substance is acidic in nature ?

  2. Which one of them turns red litmus blue?

  3. What happens to the concentration of H+ ions on increasing pH value?

  4. What is the nature of substance R ?

  • Answer)
    1. P

    2. Q

    3. Decrease

    4. Neutral solution




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 16.

The equation of a neutralisation reaction is given below..

 

Ca(OH)2 + H2SO4           CaSO4 + 2H2O

 

  1. Identify the alkali in this reaction?

  2. Write down the chemical equation of the reaction between Mg(OH)2 and HCl

  3. Which is the product formed when the common components of an acid combines with the common component of an alkali ?

  • Answer)
    1. Ca(OH)2

    2. Mg (OH)2 + 2HCl                     MgCl2 + 2 H2O

    3. H2O




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 17.

Given below is the equation of a chemical reaction between an acid and an alkali.

Na+OH- + H+Cl-        NaCl + H2O

 

  1. Which is the salt formed in this reaction?

  2. What is such type of reactions commonly known as ?

  3. Name the salt formed when H2SOis used instead of HCl?

  4. Write down the chemical equation of this reaction.

 

  • Answer)

    NaCl

    Neutralisation

    Na2SO(Sodium sulphate)

    2NaOH + H2SO4       Na2SO4 + 2H2O

     




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 18.

Match the columns suitably

A

B

C

Muriate of potash

CaSO4. 2H2O

Fungicide

Blue vitriol

KCl

To control the setting time of cement

Gypsum

CuSO4 .5H2O

Substitute for table salt for B.P patients

  • Answer)

    A

    B

    C

    Muriate of potash

    KCl

    Substitute for table salt for B.P patients

    Blue vitriol

     

    CuSO4 .5H2O

    Fungicide

    Gypsum

     

    CaSO4. 2H2O

    To control the setting time of cement




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 19.

Given below are a few ions

 

NH4+ , Ca2+ , SO42_

 

  1. Write down the molecular formula of any one compound formed from the given ions.

  2. Mention any one use of this salt.

 

  • Answer)
    1. (NH4)2SO4 / CaSO4

    2. (NH4)2 SO4 - Chemical fertiliser

               CaSO4 - To control the setting time of cement.




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 20.

The salt (NH4)2SO4 can be used as chemical fertilizer.

  1. Name the cation and anion in this compound.

     

  2. Write down the molecular formulae and chemical name of the compound formed when the anion combines with magnesium ion ( Mg2+)

 

  • Answer)
    1. Anion: Sulphate ion

      Cation‍ Ammonium ion

    2. MgSO- Magnesium sulphate

     




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 21.

The molecular formulae of Sodium sulphate is Na2SO4

  1. Which is the anion in this compound ?

  2. Write down the molecular formulae of the compound formed when the anion of sodium sulphate combines with ammonium ion ( NH4+) .Mention any one use of it.

  • Answer)
    1. SO42- / Sulphate ion

    2. (NH4)2SO4

      chemical fertilizer




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 22.

The symbols of a few ions are given in the box

Ca2+ , Cl, NH4 , SO4 2-

 

a) Identify the cations.

b) Identify the anions

c) Write down the molecular formulae of all the possible compounds using the given cations and anions.

  • Answer)
    1. Cations

    Calcium ion/ Ca 2+

    Ammonium ion‍/ NH4+

    1. Anions

    Chloride ion‍/ Cl

    Sulphate ion‍ /SO42- 

    c) CaSO4

    CaCl2

    (NH4)2SO4

    NH4Cl

     




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 23.

Analyse the following chemical equation and answer the following question.

 

H2SO4 + Mg(OH)2      MgSO4 + 2H2O

a ) Identify the substance which is basic in nature? 

b ) Name the salt formed .

c ) Name the acid and base which are required to produce potassium nitrate?

  • Answer)

    a  ) Magnesium hydroxide / Mg(OH)2

    b)     Magnesium sulphate / MgSO4

    c )   Acid - Nitric acid/ HNO3

           Base - Potassium hydroxide / KOH




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 24.

It is necessary to determine the pH of soil before farming. Give reason for this statement.

  • Answer)

    Determination of pH shows whether the particular soil is acidic or basic in nature. .Based on the Pvalue suitable crops can be chosen.The PH value of the soil can also be controlled.




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 25.

The medicines used to reduce acidity are known as ..............?

(Acids , Antacids , Alkalies, Salts)

  • Answer)

    Antacids




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 26.

 Take some water in a test tube. Pass sulphur dioxide (SO2 )gas through it.

a) Dip  a blue litmus paper in the solution thus obtained. What do you observe?

b) Write down the chemical equation of the reaction taking place here.

  • Answer)

    a ) Blue litmus paper turns red.

    b )   SO2 + H2    H2SO3




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 27.

Match the following.

 

A

B

C

Copper sulphate

CaSO4.2H2O

Manufacture of glass

Sodium carbonate

CuSO4.5H2O

A fungicide

Gypsum

Na2CO3.10H2O

Manufacture of cement

  • Answer)

    A

    B

    C

    Copper sulphate

    CuSO4. 5H2O

    A fungicide

    Sodium carbonate

    Na2CO3.10H2O

    Manufacture of glass

    Gypsum

    CaSO4.2H2O

    Manufacture of cement




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 28.

Which one of the following compounds is not used as chemical fertilizer?

[ ( NH4)2SO4 , KCl , NaHCO3 , NaNO3 ]

 

  • Answer)

    NaHCO3




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 29.

Which of the following compounds is used as chemical fertiliser ?

( NaCl , HNO3 , (NH4)2SO4 , BaCl2 )

 

  • Answer)

    (NH4)2SO/ Ammonium sulphate




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 30.

Molecular formula of magnesium chloride is MgCl2

a) Identify the cation and anion and write them

b) What is the valency of magnesium

c) Write down the chemical formula of magnesium oxide if the valency of oxygen is 2

  • Answer)

    a) Cation - Magnesium ion /Mg2+

          Anion - Chloride ion‍/Cl-

    b) 2

    c) MgO




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 31.

When an acid reacts with an alkali, the products obtained are magnesium sulphate and water.

  1. Name the acid used in this reaction?

  2. Identify the alkali used here ?

     

  • Answer)
    1. Sulphuric acid / H2SO4

    2. Magnesium hydroxide /Mg(OH)2




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 32.

What is the pH value of water ?

( 0, 5, 7, 14 )

  • Answer)

    7




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 33.

Complete the given chemical equation.

  1. NaOH + HCl        .................. + ................

  2. What is the common name by which this type of reaction known ?

  3. What is the nature of the substances used to reduce acidity in the stomach. ?

  • Answer)
    1.  NaCl    +  H2O
    2.  Neutralisation
    3. Basic nature



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 34.

pH value of some solutions are given in the table. Examine the table and answer the questions

Solution

pH value

A

4

B

7

C

13

D

2

E

8

 

  1. Which one of these represent a neutral solution?

  2. Which solution is more alkaline in nature?

  3. Which one of these is more acidic in nature ?

  4. Give the common name of the reaction in which A and C react together?

  • Answer)
    1. B
    2. C
    3.  D
    4. Neutralisation reaction



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 35.

Complete the following ionic equations.

a) H2CO3         ...............  +  CO3 2-

b) KOH           K+ +   .............

c) NH4OH        ...............  +  OH-

d) HNO3        H+ + ...............

 

  • Answer)

    a) 2H+

    b)  OH-

    c) NH4+

    d) NO3-




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 36.

a) Which one of the following represent a tri basic acid?

( H2CO, HNO, H3PO, HCl , H2SO4 )

b) Compete the following chemical equations.

H2SO4                        ...............  + HSO4-

HSO4-                       H+ + ..................

  • Answer)

    a) H3PO4

    b) H +

         SO2-




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 37.

Given below are the equations of chemical reaction taking place when Hydrochloric acid dissolves in water. Analyse them and complete the equations.

  1. HCl   H+ .................

  2. H+ + H2O   ..................

  • Answer)
    1. Cl-

    2. H3O+




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 38.

a) Classify the following in to acidic and basic oxides.

[ CaO, CO2 , MgO, SO2‍ ]

b)Name the gases found in large quantities in the materials expelled from factories?

c) Which are the acids obtained when these gases dissolve in water?

 

  • Answer)

    Acidic - CO2 , SO2

         Basic - CaO, MgO

    b)  CO2 , SO2,, NO2  

    c)  Carbonic acid(H2CO3), sulphurous acid(H2SO3), Nitric acid(HNO3)




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 39.

Take dilute hydrochloric acid in a test tube.Put some calcium carbonate in it.

a) Name the gas produced here ?

b) Name the compound formed when this gas gets dissolved in water?

c) Write the balanced chemical equation for the reaction in (b)

 

  • Answer)

    a) Carbon dioxide

    b)Carbonic acid /H2CO3

    c)         CO+   H2 H2CO3

     

     




Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Class 10 English Medium SAMAGRA Question Pool Click here
Class 10 - Malayalam Medium SAMAGRA Question Pool Click here
Class 9 English Medium SAMAGRA Question Pool Click here
Class 11 SAMAGRA Question Pool Click here
Class 12 SAMAGRA Question Pool Click here


Join BrainsPrep

Get BrainsPrep on android and stay updated via Facebook.


Responsive image Google Play   Responsive image Facebook



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Tuition