Engineering Entrance Sample Papers

Chemical Arithmetic – Stoichiometry Questions

Chemistry (Chemical Airthmetic)

Chemical Arithmetic (Stoichiometry) Questions Bank

Atoms Molecules And Chemical Arithmetic

Question 1
The law of multiple proportions was proposed by
A
Dalton
B
Gay-Lussac
C
Lavoisier
D
Proust
Question 2
1 L of N2 combines with 3 L of H2 to form 2L of NH3 under the same conditions. This illustrates the
A
Law of reciprocal proportions
B
Law of constant composition
C
Law of multiple proportions
D
Gay-Lussac’s law of gaseous volumes
Question 3
The element similar to carbon is
A
Sn
B
Mn
C
Mg
D
Po
Question 4
If two compounds have the same empirical formula but different molecular formula, they must have
A
Different molecular weights
B
Same viscosity
C
Different percentage composition
D
Same vapour density
Question 5
The maximum amount of BaSO4 precipitated on mixing equal volumes of BaCl2 (0.5 M) with H2SO4 (1M) will correspond to
A
2.0 M
B
0.5 M
C
1.5 M
D
1.0 M
Question 6
The number of equivalents of Na2S2O3 required for the volumetric estimation of one equivalent of Cu2+ is
A
1
B
3
C
3/2
D
2
Question 7
A mixture of ZnCl2 and PbCl2 can be separated by
A
Adding aceitic acid
B
Distillation
C
Crystallization
D
Sublimation
Question 8
One part of an element A combines with two parts of another B. Six parts of the element C combine with four parts of the element B. if A and C combine together the ratio of their weights will be governed by
A
Law of reciprocal proportion
B
Law of conservation of mass
C
Law of multiple proportion
D
Law of definite proportion
Question 9
The number of significant figures in 6.02 x 1023 is

Related: SSC CPO General Knowledge Sample Paper

A
23
B
4
C
3
D
v
Question 10
One sample of atmospheric air is found to have 0.03% of carbon dioxide and another sample 0.04%. This is evidence that
A
The law of constant composition is not always true
B
Air is a compound
C
Air is a mixture
D
The law of multiple proportions is true
Question 11
If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
A
Remain unchanged
B
Increase two fold
C
Be a function of the molecular mass of the substance
D
Decrease twice
Question 12
12g of Mg (at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be
A
11.2 L
B
44.8 L
C
6.1 L
D
22.4 L
Question 13
Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be
A
100 ml
B
40 ml
C
20 ml
D
60 ml
Question 14
After a chemical reaction, the total mass of reactants and products
A
Is not changed
B
Is always less or more
C
Is always increased
D
Is always decreased
Question 15
1.5 mol of O2 combine with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is
A
72 g
B
24 g
C
36 g
D
48 g
Question 16
The number of moles of sodium oxide in 620 g of it is

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A
100 moles
B
18 moles
C
10 moles
D
1 mol
Question 17
16.8 litre gas containing H2 and O2 is formed at NTP on electrolysis of water. What should be the weight of electrolysed water?
A
10 g
B
5 g
C
12 g
D
9 g
Question 18
The volume occupied by 4.4 g of CO2 at STP is
A
22.4 L
B
0.1 L
C
2.24 L
D
0.224 L
Question 19
One part of an element A combines with two parts of another B. Six parts of the element C combine with four parts of the element B. if A and C combine together the ratio of their weights will be governed by

Related: Permutation and Combination Questions

A
Law of reciprocal proportion
B
Law of multiple proportion
C
Law of conservation of mass
D
Law of definite proportion
Question 20
M is the molecular weight of KMnO4. The equivalent weight of KMnO4 when it is converted into K2MnO4 is
A
M / 7
B
M / 5
C
M / 3
D
M
Question 21
The equivalent weight of phosphoric acid (H3PO4) in the reaction,
A
59
B
25
C
98
D
49
Question 22
The normality of orthophosphoric acid having purity of 70% by weight and specific gravity 1.54 would be

Related: Chemical analysis - Multiple choice questions

A
11 N
B
44 N
C
33 N
D
22 N
Question 23
Equivalent weight of KMnO4 acting as an oxidant in acidic medium is
A
One-fifth of its molecular weight
B
The same as its molecular weight
C
Half of its molecular weight
D
One-third of its molecular weight
Question 24
Which one of the following properties of an element is not variable?
A
Atomic weight
B
Valency
C
Equivalent weight
D
All of these
There are 24 questions to complete.
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Vishal Arora

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