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Chemical Arithmetic and Volumetric Analysis
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If Avogadro number NA, is changed from 6.022 × 1023mol-1 to 6.022 × 1020mol-1, this would change
The ratio of chemical species to each other in a balanced equation
The ratio of elements to each other in a compound
The definition of mass in units of grams
The mass of one mole of carbon
Sulphur from the chlorides S2Cl2 and SCl2. The equivalent mass of sulphur in SCl2 is
32 g/mole
64.5 g/mole
88 g/mole
16 g/mole
0 g of magnesium is burnt with 0.56 g O2 in a closedvessel.
Which reactant is left in excess and how much
(At. wt. Mg = 24; O = 16)
Mg, 0.16 g
Mg, 0.44 g
O2, 0.28 g
O2, 0.16 g
Volume occupied by one molecule of water
(density = 1 g cm–3) is
9.0 × 10–23 cm3
5.5 × 10–23 cm3
3.0 × 10–23 cm3
6.023 × 10–23 cm3
The total number of electrons in 3 g of KHto that in 1.8 g of H2O
double
Triple
one fourth
Same
How many g of dibasic acid (mol.
weight 200) should be present in 100 ml. of the aqueous solution to give strength of 0.1 N
d) 20 g
b) 2 g
c) 1 g
a) 10 g
Among FeSO4.7H2O
(A), CuSO4.5H2O
(B), ZnSO4.7H2O
(C), MnSO4.4H2O
(D), isomorphous salts are
A and D
A and C
A anad B
C and B
The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is
2.10 mole
0.186 mole
0.21 mole
0.0093 mole
The total number of electrons present in 18ml of wtaer ( density of water 1g/ml) is
6.02 × 1025
6.02 × 1024
6.02 × 1022
6.02 × 1023
The sulphate of metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is
11.3
36.3
24.3
40.3
The number of gram molecules of oxygen in 6.02×1024 CO molecules is
b) 5 gm molecules
c) 1 gm molecules
a) 10 gm molecules
d) 0.5 gm
A certain amount of a metal whose equivalent mass is 28 displaces 0.7 L of H2 at S.T.P. from an acid hence mass of the element is
3.50 g
7.00 g
0.875 g
1.75 g
For preparing 0.1N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be
less than the theoretical weight
more than the theoretical weight
same as the theoretical weight
None of the above
The number of water molecules in 1 litre of water is
18
18 ×1000
55.55 NA
Na
The amount of water that should be added to 500ml of 0.5N solution of NaOH to give a concentration of 10mg per ml is
250
200
500
100
A compound
(60g) on analysis gave C=24g, H=4g, O=32g.
Its empirical formula is
CH2O
CH2O2
C2H2O2
C2H4O2
The number of water molecules present in a drop of water ( volume 0.0018ml) at room temperature is
1.084×1018
4.84×1017
6.023×1023
6.023 × 1019
12 mL of gas is produced at S.T.P. by the action of 4.12 mg of alcohol, ROH, with methyl magnesiumbromide.
The molecular mass of alcohol is
156.0
41.2
82.4
16.0
Avogadro number is
number of molecules present in one gram molecular mass of a substance
number of milliliters which one mole of gaseous substance occupies at N.T.P
All are correct
number of atoms in one gram element
The volume of water to be added to 100cm3 of 0.5N H2SO4 to get deci normal concentration is
450 cm3
100 cm3
500 cm3
400 cm3
1
2
7
13
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