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

 



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) 



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.



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.



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-



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 .



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......

 



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?



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......                       

 



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



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.



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



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



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 ?



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 ?



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 ?



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.

 



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

    Download App and View Complete Answer for FREE



    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.

     



    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+)

     



    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.



    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.



    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?



    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.



    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)



    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.



    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