Chemistry - S.I. Units, Significant Figures, Equivalent Mass, Atomic Mass, Mole Concept And Chemical Calculations
Exam Duration: 45 Mins Total Questions : 30
0.5 mole of Bacl2 is mixed with 0.2 mole of Na3PO4, the maximum number of moles of Ba3(PO4)2 that can be formed is
- (a)
0.01
- (b)
0.10
- (c)
0.30
- (d)
0.50
71 g of chlorine gas forms 136 g of metal chloride. The equivalent weight of metal is
- (a)
32.5
- (b)
65
- (c)
97.5
- (d)
130
When 200 g of 20% solution were cooled, part of the solute precipitated; the concentration of the solution become 12%. The mass of the precipitated substance is
- (a)
16.16
- (b)
17.17
- (c)
18.18
- (d)
19.19
w1 g of an element directly combines with oxygen forming w2 g of its oxide. The equivalent weight of the element is
- (a)
[(w2-w1)/ w1] x 8
- (b)
[w1/(w2-w1)] x 16
- (c)
[w1/(w2-w1)] x 8
- (d)
(w2/w1) x 8
For neutralising 0.183 g of a monobasic acid dissolved in water, 15 ml of N/190 NaOH were required. The molecular mass of acid is
- (a)
63
- (b)
90
- (c)
122
- (d)
140
With how much of oxygen 27 g of Al reacts completely?
- (a)
16 g
- (b)
24 g
- (c)
32 g
- (d)
48 g
In the reaction \({ H }_{ 3 }{ PO }_{ 4 }\quad +Ca{ (OH) }_{ 2 }\rightarrow \quad CaH{ PO }_{ 4 }\quad +\quad 2{ H }_{ 2 }O\) the eq. wt. of phosphoric acid (Mol. wt 98) is
- (a)
17.9
- (b)
18.6
- (c)
37
- (d)
49
The sp. heat of an element is 0.03 cal g-1 deg C-1. Its equivalent weight is 103.5. The exact atomic weight of element is
- (a)
87
- (b)
114
- (c)
207
- (d)
212
The atomic weight and equivalent weight of a metal are 13.5 and 4.5 respectively; the metal forms volatile chloride the v.d. of which would be
- (a)
30
- (b)
40
- (c)
50
- (d)
60
A metal is burnt in O2; all the products of the combustion are weighed. It is found that the weight of the metal seems to have increased by 24%. The at. wt. of metal would be
- (a)
24
- (b)
27
- (c)
33.34
- (d)
None of these
1.55 g of an oil saponified with 28 ml of N/2 alcoholic KOH. The mix requires 15 ml of N/2 HCl. The saponification value of oil is
- (a)
188.7
- (b)
178.7
- (c)
198.7
- (d)
200.7
The molecular weight of KMnO4 is 158. The equivalent weight of KMnO4 in acidic and neutral medium respectively are
- (a)
158, 158
- (b)
31.6, 31.6
- (c)
31.6, 52.6
- (d)
52.6, 52.6
How many moles of silver chloride are produced by the combination of 1.0 mol of AgNO3 and 2.0 mol of NaCl
- (a)
1.0
- (b)
2.0
- (c)
1.5
- (d)
3.0
The reactant which is completely consumed during the reaction is called
- (a)
active reactant
- (b)
active product
- (c)
limiting reagent
- (d)
limiting product
Four grams of copper chloride on analysis gave 1.890 g of copper and 2.110 g of chlorine. The empirical formula of copper chloride is
- (a)
CuCl
- (b)
CuCl2
- (c)
Cu2Cl2
- (d)
None of these
How many moles of sodium chloride are present in 250 cm3 of a 0.500 M NaCl ?
- (a)
0.125
- (b)
0.250
- (c)
0.375
- (d)
0.500
What is the mass in grams of 0.25 mol copper?
Cu = 63.5 a.m.u.
- (a)
8
- (b)
16
- (c)
24
- (d)
32
How many molecules of benzene are there in 1 litre of benzene? Specific gravity of benzene is 0.88.
- (a)
3.4 x 1024
- (b)
6,8 x 1024
- (c)
1.7 x 1024
- (d)
13.6 x 1024
For the preparation of 0.6 mol of K2Cr2O7, the number of potassium atoms required are
- (a)
2.0 x 1023
- (b)
7.22 x 1023
- (c)
6.02 x 1023
- (d)
3.01 x 1024
The number of moles of CO2 which contain 8.0 g of oxygen are
- (a)
0.25
- (b)
0.50
- (c)
1.0
- (d)
1.50
How many moles of lead nitrate are required to produce 48 g of oxygen?
- (a)
4 moles
- (b)
3 moles
- (c)
2 moles
- (d)
1 mole
One mole of CO2 contains
- (a)
6.023 x 1023 atoms of carbon
- (b)
3 g atoms of CO2
- (c)
18.1 x 1023 molecules of CO2
- (d)
6.023 x 1023 atoms of oxygen
The maximum amount of BaSO4 precipitated on mixing BaCl2 (0.5 M) with H2SO4 (1 M) will correspond to
- (a)
0.5 M
- (b)
1.0 M
- (c)
1.5 M
- (d)
2.0 M
Assume that the nucleus of the fluorine atom is a sphere of radius 5 x 10-13 cm. What is the density of matter in teh nucleus?
- (a)
6.02 x 1023 g/ml
- (b)
6.02 x 1013 g/ml
- (c)
12.02 x 1023 g/ml
- (d)
12.02 x 1013 g/ml
The number of moles of oxygen in 1L of air containing 21 % oxygen by volume, in standrad conditions, is
- (a)
0.186 mol
- (b)
0.21 mol
- (c)
2.10 mol
- (d)
0.0093 mol
The number of oxygen atoms in 4.4 g of CO2 is approx.
- (a)
1.2 x 1023
- (b)
6 x 1022
- (c)
6 x 1023
- (d)
12 x 1023
Which of the following has the largest number of atoms?
- (a)
0.5 g atoms of Cu
- (b)
0.635 g of Cu
- (c)
0.25 moles of Cu atoms
- (d)
1 g of Cu
The number of gram- molecules of oxygen in 6.02 x 1024 CO molecules is :
- (a)
10 g-molecules
- (b)
5 g-molecules
- (c)
1 g-molecule
- (d)
0.5 g-molecule
Two elements, X ( at. mass 75) and Y ( at. mass 16) combine to give a compound having 78.8% X. The formula of the compound is :
- (a)
XY
- (b)
X2Y
- (c)
X2Y2
- (d)
X2Y3
1 mol of CH4 contains
- (a)
6.02 x 1023 atoms of H
- (b)
4 g-grams of hydrogen
- (c)
1.81 x 1023 molecules of CH4
- (d)
3.0 g of carbon
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