8 gm of CaCO<sub>3</sub> on heating gave 3.25 gm CO<sub>2</sub> gas. The mass of residue left is:

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4

Physical Chemistry MCQ with Answers

4) 8 gm of CaCO₃ on heating gave 3.25 gm CO₂ gas. The mass of residue left is:

4 gm

4.48 gm

12 gm

16 gm

Answer is:

4.48 gm

Physical Chemistry MCQ with Answers

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5) In one experiment, 12 gm of Mg combines with 8 gm of O₂ to form 20 gm of MgO. In another experiment, when 150 gm of Mg combines with 100 gm of O₂, then 250 gm of MgO is formed. These two experiments follow:

The law of conservation of mass

The law of constant composition

The law of definite proportion

All of these

Answer is:

All of these

6) H combines with O to form two compounds, water and hydrogen peroxide. If 2 gm of H reacts with O completely to form 18 gm of water and 34 gm of hydrogen peroxide, then what is the ratio of mass of O combining with H?

3:09

4:16

1:02

None of these

Answer is:

0.043055556

Explanation:

The ratio of masses of oxygen which combine with 2 gm of hydrogen to give H₂O and H₂O₂ are 16 : 32 = 1 : 2.

7) The vapour density of a gas is 11.2, then 11.2 gm of this gas at NTP will occupy a volume of:

1.12 L

0.112 L

112 L

11.2 L

Answer is:

11.2 L

Explanation:

Vapour density of any gas at NTP occupies a volume of 11.2 L.

8) Calculate the number of molecules of dinitrogen oxide in 0.044 kg of the gas:

6.02 x 10²³

3.01 x 10²³

12 x 10²³

None of these

Answer is:

6.02 x 10²³

Physical Chemistry MCQ with Answers

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4) 8 gm of CaCO3 on heating gave 3.25 gm CO2 gas. The mass of residue left is:

4.48 gm

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

5) In one experiment, 12 gm of Mg combines with 8 gm of O2 to form 20 gm of MgO. In another experiment, when 150 gm of Mg combines with 100 gm of O2, then 250 gm of MgO is formed. These two experiments follow:

All of these

6) H combines with O to form two compounds, water and hydrogen peroxide. If 2 gm of H reacts with O completely to form 18 gm of water and 34 gm of hydrogen peroxide, then what is the ratio of mass of O combining with H?

0.043055556

7) The vapour density of a gas is 11.2, then 11.2 gm of this gas at NTP will occupy a volume of:

11.2 L

8) Calculate the number of molecules of dinitrogen oxide in 0.044 kg of the gas:

6.02 x 1023

Physical Chemistry MCQ with Answers

4) 8 gm of CaCO₃ on heating gave 3.25 gm CO₂ gas. The mass of residue left is:

5) In one experiment, 12 gm of Mg combines with 8 gm of O₂ to form 20 gm of MgO. In another experiment, when 150 gm of Mg combines with 100 gm of O₂, then 250 gm of MgO is formed. These two experiments follow:

6.02 x 10²³