Question Pool Gas Laws & Mole Concept

# Gas Laws & Mole Concept - SAMAGRA Question Pool & Answers | Class 10 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 10 English Medium Chemistry Gas Laws & Mole Concept Qn 1.

The volume of a fixed mass of gas at 300K is 10L.What will be the volume of the gas,if the temperature is doubled without changing the pressure.

Volume and temperature are directly proportional.Therefore volume changes to 20L / Volume doubled

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Qn 2.

The relation showing the volume and temperature of fixed mass of gas at constant pressure is tabulated below.

 Volume V(L) Temperature T(K) V / T 600 300 2 800 .......(a)..... 2 ......(b)........ 450 2

i) Find out the values of a and b.

ii)State the gas law associated with this.

iii) Write down any one instance from daily life related with this law.

i) a = 400, b = 900

ii) At constant pressure,the volume of a definite mass of a gas is directly proportional to the temperature in

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Qn 3.

a) What happens to the size of a gas bubble rising from the bottom of a water body?why?

b)Which is the gas law associated with this?

a)size increases

As the bubbles move from bottom to top in a water body,pressure decreases and correspondingly the volume increases.

b)Boyle's

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Qn 4.

The volume of a fixed mass of gas at 2 atm pressure is 20L.What will be its volume if the pressure is increased 4 times without changing the temperature.

PV = a constant

2 x20 = 40

8 x X = 40

X = 40 / 8 =5

Volume changes to 5

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Qn 5.

The data of an experiment conducted on a fixed mass of gas at constant temperature are given

 Pressure P(atm) Volume V(L) PV 1 10 .....(a).... 2 ......(b)........... 10 .....(c)......... 2.5 10

i)Complete the table and find out the speciality of PV.

ii)What is the relation between pressure and volume?

iii) Which gas law can be proved by this experiment?

i) a = 10,b = 5L, c = 4 atm, PV ia a constant

ii)Volume and pressure are inversely propotional.

iii)Boyle's

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Qn 6.

What happens to the following when the temperature of a gas in a closed container is increased ?

a) Kinetic energy

b)Pressure

a) Kinetic energy increases

b)Pressure

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Qn 7.

When a gas contained in a 2L cylinder is completely transferred to a 4L cylinder,the volume of the gas will be ...........

4L

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Qn 8.

Select the statements suitable to gases from those given below.

a) Intermolecular distance is very low.

b)The volume of gas depends on the volume of the container in which it is occupied.

c)The energy of gaseous molecules is very high.

d)The attractive force between gaseous molecules is very high.

b)The volume of gas depends on the volume of the container in which it is occupied

c / The energy of gaseous molecules is very

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Qn 9.

a) How many moles are there in 140g Nitrogen?.

b) How many atoms are there in 140g Nitrogen?

(Atomic mass : N- 14 )

(a) 5

(b) 10

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Qn 10.

Find out the molecular mass of the following compounds

(Atomic Mass : Ca - 40 , N- 14 , C - 12 , O -16 , H- 1)

a) Ca(NO3)2           b) C12H22O11

a = 164, b = 342

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Qn 11.

N+ 3 H2→ 2NH3

The ratio of reactants and products in the above reaction is 1:3:2 .Complete the table related with this reaction.

 Chemical reaction Reactants Products N2 H2 NH3 Moles (a) 6 4 Molecules 4 x 6.022 x1023 (b) 8 x 6.022 x1023 Volume at STP (c) 69.2 L 44.8 L Mass 140 g 30 g (d)

a) 2

b) 12 x6.022 x1023

c) 22.4 L

d) 170

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Qn 12.

NaOH + HCl → NaCl + H2O

a) How many moles of NaOH is needed to completely react with 1 mole of HCl ?

b) How many grams of HCl is required to completely neutralise 160g NaOH ?

a) 1

b) 146 g

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Qn 13.

Analyse the following equation and answer the questions

2Na + Cl2→ 2NaCl

a) What is the ratio of reactant molecules and product molecules?

b)How many moles of NaCl will be obtained on reaction of 10 moles of chlorine ?

c) Find the mass of sodium required to get so much amount of NaCl .

a) 2:1:2

b)20mole

c) 20x 23 =

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Qn 14. i) (i)Find a,b and c

ii) How many grams of H2O is required to get 5 x 6.022 x 1023 molecules ?

i)

a) 10 x 6.022 x 1023

b) 224 L

c) 10 GMM

ii)

90 g

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Qn 15.

Which of the following have the same number of moles ?

[4 GMM H2 , 88 g CO2 , 89.6 L O2 , 4 g He]

4 GMM H2 , 89.6 L

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Qn 16.

Which one contains 2 x 6.022 x1023 Molecules ?

(28 g N2 , 2 g H2 , 32 g O2 , 44.8 L CO2)

44.8 L CO2

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Qn 17.

Which one is used as the basis of atomic mass now a days?

(H-1 , C-12 , C-14 , O – 16)

C-12

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Qn 18.

4 x 6.022 x 10 23 Chlorine molecules at STP are taken. Answer the following

questions(Atomic mass : Chlorine = 35.5)

a) What is its volume at STP ?

b) What is the mass of this compound?

c) H2 + Cl2 → 2HCl

How many molecules of hydrogen are required to completely react with 4 x6.022x1023 molecules of chlorine ?

a) 89.6 L

b) 284 g

c) 4 x

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Qn 19.

Volume of 2 x 6.022x1023 molecules of a gas at STP is _____

2 x 22.4L = 44.8 L

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Qn 20.

Mass of ¼ x 6.022x1023 Oxygen molecule is _____________ .

(Hint : Oxygen- Molecular mass = 32)

8 g

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Qn 21.

Complete the table.

 Substance Volume at STP Number of moles Mass(g) CO2 44.8 L 2 88 CH4 (a) (b) 4 g NH3 11.2 L (c) (d)

(Hint : MM : CO= 18 , CH= 16 , NH3 = 17 )

a) 1/4 x 22.4 = 5.6 L

b) ¼ or 0.25

c) ½

d) 8.5

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Qn 22.

N2 + 3 H2 → 2 NH3

Number of moles of hydrogen required to completely react with 2moles of nitrogen is _______

6 mole hydrogen

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Qn 23.

360 g glucose [C6H12O6] is given.

a) How many molecules are there in the sample ?

b) What is the total number of atoms in the sample? (Hints: Molecular mass C6H12O6 = 180)

a) GMM of C6H12O= 180 g

Number of moles in 360g glucose = 360g / 180 g = 2

Number of molecules = 2 x

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Qn 24.

Which of the samples given below contains 1mole Oxygen atoms ?

(Atomic mass O = 16 )

a. 16 g Oxygen .

b. 8g Oxygen.

c . 32 g Oxygen.

d . 22.4 L oxygen at STP

a. 16 g Oxygen.

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Qn 25.

Some samples are given

(P) 22.4 L NH3 (Q) 22 g CO2 (R) 64 g SO2 (S) 117 g NaCl

(GMM : NH3 = 17 g , CO= 44 g (c) SO2 = 64 g (d) NaCl = 58.5 g)

a) Which among the above are having the same moles?

b) How many molecules are there in sample Q?

c) How many grams of NHare needed to get the same number of molecules in sample S ?

a) P, R

b22 g CO2 is

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Qn 26.

Which among the following samples have the same number of molecules.

a) 88 g CO2 b) 54 g H2O c) 4 g Hd) 17 g NH3

(Atomic mass : C = 12 , O = 16 , H = 1 ,N =14 )

a, c

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Qn 27.

The equation showing the reaction of Zinc with hydrochloric acid is given.

Zn + 2HCl → ZnCl2 + H2

a) How many molecules of ZnCl2 will formed on complete reaction of 65g Zn with

HCl?

b) What will be the volume of Hformed at STP when 6.5g Zn reacts with HCl.

(Hint:Atomic mass : Zn = 65 , Cl = 35.5 , H= 1 )

a) 6.022x1023 (1 mole)

b) 0.1 x 22.4 litre = 2.24

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Qn 28.

2Mg + O2 → 2MgO

The equation showing the burning of Magnesium is given. suppose 120g of Mg is burned.

a) How many atoms are there in 120g Mg ?

b) How much will be the volume of oxygen at STP to burn this much Mg?

c ) What will be the mass of Magnesium Oxide formed ?

(Hint : Atomic mass : O = 16, Mg = 24 )

a) (120/24) x 6.022x1023 = 5 x 6.022x1023

b) 5/2 x 6.022x1023

c) 5 x (24+16) = 5 x 40 g =