Mole Concept and Stoichiometry Test

Result

Mole Concept and Stoichiometry Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is not true according to Gay Lussac`s law of combining volumes?

A
One volume of oxygen mixes with two volume of hydrogen to give three volume of water.

B
One volume of hydrogen mixes with one volume of chlorine to give two volumes of HCl gas.

C
One volume of nitrogen mixes with three volume of hydrogen to give two volumes of NH₃ gas.

D
Two volumes of CO on combustion with one volume of oxygen to give two volumes of CO₂ gas.
Question 2
1 / -0

Which of the following has the highest number of moles of oxygen atoms in its one mole?

A
H₂SO₄

B
SO₃

C
H₂SO₃

D
SO₂

E
CO₂
Question 3
1 / -0

Under the same conditions of temperature and pressure, 2 litres of SO₂, 3 litres of chlorine, 6 litres of hydrogen, 5 litres of nitrogen and 4 litres of CO₂ are collected.

Which of the following is the correct arrangement of these gases in increasing order of the number of molecules of the collected gases?

A
H₂ < N₂ < Cl₂ < CO₂ < SO₂

B
H₂ < N₂ < Cl₂ < SO₂ < CO₂

C
SO₂ < CO₂ < Cl₂ < N₂ < H₂

D
SO₂ < Cl₂ < CO₂ < N₂ < H₂
Question 4
1 / -0

Which of the following is not true for gas equation?

A
V

B
= K (constant)

C
V = × constant

D
= = K
Question 5
1 / -0

How many calcium ions are present in 7.4 g of Ca(OH)₂?

A
1.204 10²²

B
1.204 10²³

C
6.02 10²²

D
6.02 10²³

E
32.01 10²³
Question 6
1 / -0

How many molecules are present in 4 g of methane?

A
1.0 10²³

B
1.5 10²³

C
2.0 10²³

D
3.5 10²³

E
3.2 10²³
Question 7
1 / -0

What should be the mass of Na, so that it contains the same number of atoms as present in 4 g of calcium?

A
92 g

B
46 g

C
11 g

D
2.3 g

E
4.6 g
Question 8
1 / -0

Why are atomic mass of some elements not whole numbers?

A
Because of variation in number of protons in atoms of an element

B
Because of variation in number of neutrons in atom of an element.

C
Because of variation in number of electron in nucleus of an atom.

D
Because of presence of odd number of electrons in atoms of an element.
Question 9
1 / -0

4NH₃ + 5O₂ 4NO + 6H₂O
What volume of nitrogen monoxide will be produced in the above reaction at the same temperature and pressure if 36 litres of reactants are consumed?

A
36 litres

B
40 litres

C
16 litres

D
24 litres

E
30 litres
Question 10
1 / -0

How many electrons are present in 1.7g of methane?

A
6.02 10²² electrons

B
6.02 10²³ electrons

C
12.04 10²² electrons

D
12.04 10²³ electrons

E
3.011 10²³ electrons
Question 11
1 / -0

How many molecules are present in 7 g of nitrogen gas?

A
1.5 10²³

B
2.1 10²³

C
2.5 10²³

D
1.2 10²³

E
3.2 10²³
Question 12
1 / -0

Which of the following is not an application of Avogadro's law?

A
Explanation of Gay Lussac's law

B
Determination of gram atomic mass

C
Determination of molecular formula of gas

D
Determination of atomicity of a gas
Question 13
1 / -0

Which of the following has the highest number of hydrogen atoms in one mole of its molecule?

A
Calcium hydroxide

B
Water

C
Hydrogen sulphide

D
Methane
Question 14
1 / -0

What volume of methane gas is required to produce 80 ml of HCl gas in the following reaction at STP?
CH₄ + 2Cl₂ CH₂Cl₂ + 2HCl

A
20 ml

B
40 ml

C
60 ml

D
80 ml

E
70 ml
Question 15
1 / -0

An element has isotopes X and Y. Atomic mass of Y is 37 and 75% of the element exists in the form of X isotope. What is the atomic mass of X if the atomic mass of the element is 35.5?

A
37

B
35

C
34

D
33

E
31
Question 16
1 / -0

Which of the following is the correct arrangement of molecules in increasing order of mass of 0.1 mole of each of these molecules?
CaCO₃, CaCl₂, Na₂SO₄, 10H₂O, Mg
[Ca 40, Na 23, Mg 24, S = 32, C 12, Cl 35.5, O 16, H 1]

A
Mg < CaCO₃ < CaCl₂ < Na₂SO₄. 10H₂O

B
CaCO₃ < Mg < CaCl₂ < Na₂SO₄.10H₂O

C
CaCl₂ < Mg < CaCO₃ < Na₂SO₄. 10H₂O

D
CaCO₃ < CaCl₂ < Mg < Na₂SO₄.10H₂O
Question 17
1 / -0

Which of the following is the correct molecular mass of CuSO₄.5H₂O?
(Cu 63.5, S 32, O 16, H 1)

A
185.5 amu

B
159.5 amu

C
249.5 amu

D
259.5 amu

E
154.95 amu