Test: Mole Concept & Molar Mass (NCERT) - NEET MCQ

# Test: Mole Concept & Molar Mass (NCERT) - NEET MCQ

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## 25 Questions MCQ Test - Test: Mole Concept & Molar Mass (NCERT)

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Test: Mole Concept & Molar Mass (NCERT) - Question 1

### What is the mass of carbon dioxide which contains the same number of molecules as are contained in 40 g of oxygen?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 1

Molar mass of O2 = 32 g mol-1
32 g of O2 = 6.023 x 1023 molecules
40 g of O = 7.529 x 1023 molecules
Mass of 6.023 x 1023 molecules of CO2 = 44 g
Mass of 7.529 x 1023 molecules of CO2

Test: Mole Concept & Molar Mass (NCERT) - Question 2

### Match the column I with column II and mark the appropriate choice.

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 2

(A): Zn + 2HCl → ZnCl2 + H2
1 mole of Zn produces 2 g of H2
0.5 mole of Zn will produce 1 g of H2
(B): C70H22
Molar mass - 862
Mass of atoms = 862/6.023 x 1023 = 1.43 x 10-21 g
(C): 70 g of CI2 = 6.023 x 1023 molecules
35.5 g of CI2 = 3.01 x 1023 molecules
(D): Molar mass of SO2 = 64 = 1 mole
64 g of SO2 = 6.023 x 1023 molecules

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Test: Mole Concept & Molar Mass (NCERT) - Question 3

### The number of oxygen atoms present in 1 mole of oxalic acid dihydrate is

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 3

One molecule of oxalic acid dihydrate (COOH)2H2O contains 6 oxygen atoms.
Number of oxygen atoms in 1 mole = 6 x 6.023 x 1023 = 36.13 x 1023 atoms

Test: Mole Concept & Molar Mass (NCERT) - Question 4

The density of a gas is 1.78 g L-1 at STP. The weight of one mole of gas is

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 4

1 mole occupies a volume of 22.4 L at STP
Mass of 1 mole of a gas = Density x Volume
= 1.78 x 22.4 = 39.9 g

Test: Mole Concept & Molar Mass (NCERT) - Question 5

Which of the following gases will have least volume if 10 g of each gas is taken at same temperature and pressure?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 5

Number of moles ∝ 1/Molecular mass Molecular mass of CO2 = 44, N2 = 28, CH4 = 16, HCl = 36.5
CO2 will have least volume, as no. of moles is directly proportional to volume at constant P and T.

Test: Mole Concept & Molar Mass (NCERT) - Question 6

How many number of molecules and atoms respectively are present in 2.8 litres of a diatomic gas at STP?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 6

Number of molecules of gas at STP
molecules
Number of atoms in diatomic molecule
= 2 x 7.5 x 1022 = 15 x 1022 atoms

Test: Mole Concept & Molar Mass (NCERT) - Question 7

Total number of atoms present in 34g of NH3 is

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 7

No. of moles of 34 g of NH3 = 34/17 = 2
No. of molecules = 2 x 6.023 x 1023
No. of atoms in one molecule of NH3 = 4
No. of atoms in 2 molecules of NH3
= 4 x 2 x 6.023 x 1023 = 48.18 x 1023

Test: Mole Concept & Molar Mass (NCERT) - Question 8

What will be the mass of 100 atoms of hydrogen?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 8

Number of gram atoms of H

Mass of hydrogen atoms = 1 x 1.66 x 10-22
= 1.66 x 10-22 g

Test: Mole Concept & Molar Mass (NCERT) - Question 9

How many atoms in total are present in 1 kg of sugar?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 9

One molecule of sugar (C12H22O11) = 45 atoms
Number of moles of sugar = 1000/342 = 2.92
Number of molecules = 2.92 x 6.023 x 1023
= 17.60 x 1023
molecules Number of atoms = 45 x 17.60 x 1023
= 7.92 x 1025 atoms

Test: Mole Concept & Molar Mass (NCERT) - Question 10

How many moles of oxygen gas can be produced during electrolytic decomposition of 180 g of water?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 10

2H2O → 2H2 + O2
2 x 18 = 36g
36 g of water produces 1 mole of O2 gas.
180 g of water will produce 180/36 = 5 moles of O2 gas.

Test: Mole Concept & Molar Mass (NCERT) - Question 11

1.4 moles of phosphorus trichloride are present in a sample. How many atoms are there in the sample?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 11

No. of atoms in 1 mole of PCI3 = 4
No. of atoms in 1.4 moles of PCI3
= 4 x 1.4 x 6.022 x 1023 = 3.372 x 1024

Test: Mole Concept & Molar Mass (NCERT) - Question 12

What will be the standard molar volume of He, if its density is 0.1784 g/L at STP?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 12

Standard  molar volume is the volume occupied by 1 mole of a gas at STP.
0.1784 g of He occupies volume = 1 L
4 g (1 mole) of He occupies 4/0.1784 = 22.4 L

Test: Mole Concept & Molar Mass (NCERT) - Question 13

In a mixture of gases, the volume content of a gas is 0.06% at STP. Calculate the number of molecules of the gas in 1 L of the mixture.

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 13

Volume of gas in 1 L = 0.06/100 = 6 x 10-4 L
Number of molecules of CO2 = n x NA
6 x 10-4/22.4 x 6.023 x 1023 = 1.61 x 1019

Test: Mole Concept & Molar Mass (NCERT) - Question 14

What will be the weight of CO having the same number of oxygen atoms as present in 22 g of CO2?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 14

No. of O atoms in CO2 = 2
Molar mass of CO2 = 44 g
44 g = 1 mol ⇒ 22 g = 0.5 mol
1 mole of CO2 contains = 2 x 6.023 x 1023 O atoms
0.5 mole of CO2 = 6.023 x 1023 O atoms
1 mole of CO = 6.023 x 1023 O atoms
Mass of 1 mole of CO = 12 + 16 = 28 g

Test: Mole Concept & Molar Mass (NCERT) - Question 15

Match the mass of elements given in column I with the no. of moles given in column II and mark the appropriate choice.

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 15

(A) 28 gof He = 28/4 = 7mol
(B) 46 g of Na = 46/23 = 2 mol
(C) 60 g of Ca = 60/40 = 1.5 mol
(D) 27 g of Al = 27/27 = 1 mol

Test: Mole Concept & Molar Mass (NCERT) - Question 16

How many number of aluminium ions are present in 0.051 g of aluminium oxide?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 16

Mass of AI2O3 = 2 x 27 + 3 x 16 = 102
0.051 g of AI2O3 = 0.051/102 = 0.0005 mol
1 mol of AI2O3 contains 2 x 6.023 x 1023 Al3+ ions
0.0005 mol of AI2O3 contains 2 x 0.0005 x 6.023 x 1023
Al3+ ions = 6.023 x 1020 Al3+ ions

Test: Mole Concept & Molar Mass (NCERT) - Question 17

Which of the following correctly represents 180 g of water?
(i) 5 moles of water
(ii) 10 moles of water
(iii) 6.023 x 1023 molecules ofwater
(iv) 6.023 x 1024 molecules of water

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 17

18g of H2O = 1 mol
180 g of H2O = 10 mol
18 g of H2O = 6.023 x 1023 molecules of H2O
180 g of H2O = = 6.023 x 1024 molecules of H2O

Test: Mole Concept & Molar Mass (NCERT) - Question 18

How many grams of CaO are required to react with 852 g of P4O10?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 18

6CaO + P4O10 → 2Ca3(PO4)2
1 mole of P4O10 = molar mass, of P4O10 = 284g
852 g of P4O10 = 852/284 = 3mol
1 mole of P4O10 reacts with.6 moles of CaO
3 moles of P4O10 reacts with 18 moles of CaO Mass of 18 moles of CaO = 18 x 56 = 1008 g

Test: Mole Concept & Molar Mass (NCERT) - Question 19

How many oxygen atoms will be present in 88 g of CO2?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 19

1 mole of CO2 = 44 g
88 g of CO2 = 2 moles
No. of oxygen atoms in 2 moles = 2 x 2 x NA
= 2 x 2 x 6.023 x 1023 = 24.08 x 1023

Test: Mole Concept & Molar Mass (NCERT) - Question 20

A mixture having 2 g of hydrogen and 32 g of oxygen occupies how much volume at NTP?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 20

2 g of H2 = 1 mole, 32 g of O2 = 1 mole
Total volume of 2 moles of gases at NTP = 2 x 22.4 L
= 44.8L

Test: Mole Concept & Molar Mass (NCERT) - Question 21

One atom of an element weighs 3.32 x 10-23 g. How many number of gram atoms are there in 20 kg of the element?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 21

Atomic mass of an element
= Mass of one atom x NA
= 3.32 x 10-23 x 6.023 x 1023 = 19.99 = 20 g
No. of gram atoms

Test: Mole Concept & Molar Mass (NCERT) - Question 22

Test: Mole Concept & Molar Mass (NCERT) - Question 23

Fill in the blanks by choosing the correct options.

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 23

1 mole = 6.023 × 1023 atoms / molecules = X
1 mole = Molar volume =22.4 L at NTP = Y
1 mole = Gram atomic mass or gram molecular mass = Z
Hence, option B is correct.

Test: Mole Concept & Molar Mass (NCERT) - Question 24

The mass of one mole of a substance in grams is called its

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 24

Explanation for the Term Molar Mass:
Definition: Molar mass is defined as the mass of one mole of a particular substance. It is usually expressed in grams per mole (g/mol).

Concept of Mole: A mole is a unit in chemistry that is used to express amounts of a chemical substance. It is defined as the amount of any substance that contains as many entities (e.g., atoms, molecules, ions, electrons) as there are atoms in 12 grams of pure carbon-12.

Calculation of Molar Mass:
The molar mass is calculated by summing the masses of all the atoms in a molecule. For instance, the molar mass of water (H2O) is calculated by adding the molar masses of hydrogen and oxygen.

Difference from Other Terms:
Molar mass is different from molecular mass, Avogadro's mass, and formula mass. Molecular mass refers to the mass of a single molecule, measured in atomic mass units (amu). Avogadro's mass is a deprecated term that was used to refer to the molar mass of carbon-12. And formula mass refers to the sum of the atomic weights of the atoms in the empirical formula of any compound.

Usage: The concept of molar mass is fundamental in chemistry, as it connects the macroscopic world (scale of grams, liters, etc.) with the microscopic one (scale of atoms, molecules, etc.). It is used in various calculations such as stoichiometry, gas laws, and solution preparation.

Test: Mole Concept & Molar Mass (NCERT) - Question 25

What is the total number of electrons present in 1.6 g of methane?

Detailed Solution for Test: Mole Concept & Molar Mass (NCERT) - Question 25

1 mole of CH= 16 g
16 g of CH4 contain 10 electrons
1.6 g of CH4 contain 10/16 x 1.6 x 6.023 x 1023
= 6.023 x 1023 electrons

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