Stoichiometry and its Calculations
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307008 The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess H2S in the presence of conc. HCl (assuming 100% conversion) is:

1 0.25 mol
2 0.50 mol
3 0.333 mol
4 0.125 mol
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307009 Which of the following statements is correct about the reaction given below?
4Fe(s)+3O2(g)2Fe2O3(g)

1 Total mass of iron and oxygen in reactants = total mass of iron and oxygen on product therefore it follows law of conservation of mass.
2 Total mass of reactants = total massof product; therefore, law of multiple proportions is followed.
3 Amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess.
4 Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307010 n g of a substance X reacts with m g of substance Y to form p g of substance R and q g of substance S.
This reaction can be represented as follow : X+Y=R+S
The relation which can be established in the amounts of the reactants and the products will be

1 n – m = p – q
2 n + m = p + q
3 n = m
4 p = q
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307012 What volume of CO2 will be liberated at NTP, if 12 g of carbon is burnt in excess of oxygen?

1 11.2 L
2 22.4 L
3 2.24 L
4 1.12 L
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307008 The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess H2S in the presence of conc. HCl (assuming 100% conversion) is:

1 0.25 mol
2 0.50 mol
3 0.333 mol
4 0.125 mol
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307009 Which of the following statements is correct about the reaction given below?
4Fe(s)+3O2(g)2Fe2O3(g)

1 Total mass of iron and oxygen in reactants = total mass of iron and oxygen on product therefore it follows law of conservation of mass.
2 Total mass of reactants = total massof product; therefore, law of multiple proportions is followed.
3 Amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess.
4 Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307010 n g of a substance X reacts with m g of substance Y to form p g of substance R and q g of substance S.
This reaction can be represented as follow : X+Y=R+S
The relation which can be established in the amounts of the reactants and the products will be

1 n – m = p – q
2 n + m = p + q
3 n = m
4 p = q
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307011 Liquid benzene burns in oxygen according to following equation
2C6H6+15O2(g)12CO2(g)+6H2O(g)
How many litres of oxygen are required for complete combustion of 39 g of liquid benzene?

1 11.2
2 22.4
3 42
4 84
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307012 What volume of CO2 will be liberated at NTP, if 12 g of carbon is burnt in excess of oxygen?

1 11.2 L
2 22.4 L
3 2.24 L
4 1.12 L
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CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307008 The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess H2S in the presence of conc. HCl (assuming 100% conversion) is:

1 0.25 mol
2 0.50 mol
3 0.333 mol
4 0.125 mol
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307009 Which of the following statements is correct about the reaction given below?
4Fe(s)+3O2(g)2Fe2O3(g)

1 Total mass of iron and oxygen in reactants = total mass of iron and oxygen on product therefore it follows law of conservation of mass.
2 Total mass of reactants = total massof product; therefore, law of multiple proportions is followed.
3 Amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess.
4 Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307010 n g of a substance X reacts with m g of substance Y to form p g of substance R and q g of substance S.
This reaction can be represented as follow : X+Y=R+S
The relation which can be established in the amounts of the reactants and the products will be

1 n – m = p – q
2 n + m = p + q
3 n = m
4 p = q
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307011 Liquid benzene burns in oxygen according to following equation
2C6H6+15O2(g)12CO2(g)+6H2O(g)
How many litres of oxygen are required for complete combustion of 39 g of liquid benzene?

1 11.2
2 22.4
3 42
4 84
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307012 What volume of CO2 will be liberated at NTP, if 12 g of carbon is burnt in excess of oxygen?

1 11.2 L
2 22.4 L
3 2.24 L
4 1.12 L
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307008 The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess H2S in the presence of conc. HCl (assuming 100% conversion) is:

1 0.25 mol
2 0.50 mol
3 0.333 mol
4 0.125 mol
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307009 Which of the following statements is correct about the reaction given below?
4Fe(s)+3O2(g)2Fe2O3(g)

1 Total mass of iron and oxygen in reactants = total mass of iron and oxygen on product therefore it follows law of conservation of mass.
2 Total mass of reactants = total massof product; therefore, law of multiple proportions is followed.
3 Amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess.
4 Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307010 n g of a substance X reacts with m g of substance Y to form p g of substance R and q g of substance S.
This reaction can be represented as follow : X+Y=R+S
The relation which can be established in the amounts of the reactants and the products will be

1 n – m = p – q
2 n + m = p + q
3 n = m
4 p = q
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307011 Liquid benzene burns in oxygen according to following equation
2C6H6+15O2(g)12CO2(g)+6H2O(g)
How many litres of oxygen are required for complete combustion of 39 g of liquid benzene?

1 11.2
2 22.4
3 42
4 84
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307012 What volume of CO2 will be liberated at NTP, if 12 g of carbon is burnt in excess of oxygen?

1 11.2 L
2 22.4 L
3 2.24 L
4 1.12 L
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307008 The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid is treated with excess H2S in the presence of conc. HCl (assuming 100% conversion) is:

1 0.25 mol
2 0.50 mol
3 0.333 mol
4 0.125 mol
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307009 Which of the following statements is correct about the reaction given below?
4Fe(s)+3O2(g)2Fe2O3(g)

1 Total mass of iron and oxygen in reactants = total mass of iron and oxygen on product therefore it follows law of conservation of mass.
2 Total mass of reactants = total massof product; therefore, law of multiple proportions is followed.
3 Amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess.
4 Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307010 n g of a substance X reacts with m g of substance Y to form p g of substance R and q g of substance S.
This reaction can be represented as follow : X+Y=R+S
The relation which can be established in the amounts of the reactants and the products will be

1 n – m = p – q
2 n + m = p + q
3 n = m
4 p = q
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307011 Liquid benzene burns in oxygen according to following equation
2C6H6+15O2(g)12CO2(g)+6H2O(g)
How many litres of oxygen are required for complete combustion of 39 g of liquid benzene?

1 11.2
2 22.4
3 42
4 84
CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307012 What volume of CO2 will be liberated at NTP, if 12 g of carbon is burnt in excess of oxygen?

1 11.2 L
2 22.4 L
3 2.24 L
4 1.12 L