1
BASIC CONCEPTS OF CHEMISTRY
1.
How many gram of H2SO4 are present in 0.25 mole of H2SO4?
(a) 2.45
(b) 24.5
(c) 0.245
(d) 0.25
2.
7.5 g of an unknown gas occupies 5.6 litres of volume at STP. The gas may be
(a) NO
(b) N2O
(c) CO
(d) CO2
3.
How many moles of helium gas will occupy 22.4 L volume at 00C at 1 atm pressure ?
(a) 0,11
(b) 0.90
(c) 1.0
(d) 1.11
4.
Which has maximum number of molecules ?
(a) 7 g N2
(b) 2 g H2
(c) 16 g NO2
(d) 16 g O2
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5.
x L of N2 at STP contains 3 × 1022 molecules. The number of molecules in
at STP will be
(a) 3 × 1022
(c) 1.5 × 1021
6.
2
x
L of ozone
2
(b) 1.5 × 1022
(d) 1.5 × 1011
The number of molecules of water in 333 g of Al2(SO4)3. 18H2O is
(a) 18.0 × 6.02 × 1023
(b) 9.0 × 6.02 × 1023
(c) 18.0
(d) 36.0
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7.
The number of atoms of oxygen present in 10.6 g of Na2CO2 will be
(a) 6.02 × 1022
(b) 12.04 × 1022
(c)1.806 × 1023
(d) 31.8
8.
How many moles of HCl will be present is in 100 mL of a solution of specific gravity
1.08, containing 20% HCl by mass ?
(a) 0.50
b) 0.60
(c) 0.80
d) 0.12
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9.
The mass of 1 × 1022 molecules of CuSO4. 5H2O is
(a) 4.144 g
(b) 8. 288 g
(c) 2.648 g
(d) 5.295 g
10.
Which of the following contains the greatest number of atoms?
(b) 1.0 g of Nitrogen (N2)
(a) 1.0 g of butane (C4H10)
(c) 1.0 g of silver (Ag)
(d) 1.0 g of water (H2O)
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11.
If one atom of an element A weights 6.644 × 10–23 g, then number of gram-atoms in 20
kg of it is
(a) 500
b) 20
(c) 10000
(d) 20000
12.
The volume occupied by 1 mole atom of a diatomic gas at STP is
(a) 22.4 L
(b) 11.2 L
(c) 5.6 L
(d) 44.8L
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13.
Number of atoms present in 2.8 litres of diatomic gas at STP are
(a) 7.5 × 1022
(b) 6.023 × 1023
(c) 3.01 × 1023
(d) 15 × 1023
14.
Number of chloride ions in 100 mL of 0.01 M HCl solution are
(a) 6.023 × 1022
(b) 6.023 × 1021
(c) 6.923 × 1020
(d) 6.023 × 1024
15.
52u of He contains
(a) 4 × 6.023 × 1023 atoms
(c) 13 × 6.023 × 1023 atoms
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(b) 13 atoms
(d) 4 atoms.
Basic Concepts of Chemistry / 1_5_A/ Ph : 079-30004433
16.
The number of atoms in 558.5 g Fe (atomic weight of Fe = 55.85 g mol–1) is
(a) 558.5 × 6.023 × 1023
(b) Half of that in 8 g of He
(c) Twice of 60 g of C
(d) 6.02 × 1022 [AIEEE 2002]
17.
What is the weight of oxygen required for the complete combustion of 2.8 kg of
ethylene ? (Hint : C2H4 + 3 O2 → 2 CO2 + 2 H2O)
(a) 2.8 kg
(b) 6.4 kg
(c) 9.6 kg
(d) 96 kg
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18.
10 g CaCO3 on reaction with 0.1 M HCl acid will produce CO2…
HCl → CaCl2 + H2O + CO2) (At. Wt of CaCO3 is 100 g/mol
(a) 1120 cm3
(b) 2240 cm3
3
(c) 112 cm
(d) 224 cm3
19.
2.76 g of silver carbonate (atomic mass of Ag = 108) on being heated strongly yields a
residue weighing … (Ag2CO3 → Ag2O(s) + CO2(g))
(a) 2. 16 g
(b) 2.48 g
(c) 2.32 g
(d) 2.64 g
20.
The reaction of calcium with water is represented by the equation.
Ca + 2H2O → Ca (OH)2+ H2, what volume of H2, at STP would be liberated when 8 g
of calcium completely reacts with water ?
(a) 4480 cm3
(b) 2240 cm3
(c) 1120 cm3
(d) 0.4 cm3
8
(Hint : CaCO3 + 2
Basic Concepts of Chemistry / 1_5_A/ Ph : 079-30004433
21.
Assuming full decomposition, the volume of CO2 released at STP on heating 9.85 g of
BaCO3 (Atomic mass of Ba = 137) will be… (Hint : BaCO3(s) → BaO(s) + CO2(g))
(a) 0.84 L
(b) 0.24 L
(c) 4.06 L
(d) 1.12 L
22.
What weight of KClO3 on decomposition will yield 448 mL of oxygen gas at NTP? (Hint : 2
KClO3 → 2 KCl(s) + 3 O2(g))
(a) 2.45 g
(b) 1.634 g
(c) 3.67 g
(d) 4.9 g
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23.
Weight of lime (CaO) that can be prepared by heating 100 kg of lime stone (CaCO3) of
95% purity is (Hint : CaCO3(s) → CaO(s) + CO2(g))
(a) 106.4 kg
(b) 56 kg
(c) 5.32 kg
(d) 53.2 kg
24.
The number of molecules in 100 mL of 0.02 N H2SO4 is
(a) 6.02 × 1020
(b) 6.02 × 1018
(c) 6.02 × 1021
(d) 6.02 × 1022
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25.
How many milliliter (mL) of 1 MH2SO4 solution is required to neutralize 10 mL of 1 M
NaOH solution ?
(a) 2.5 mL
(b) 5.0 mL
(c) 10.0 mL
(d) 20.0 mL
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26.
How many grams of dibasic acid (molecular weight 200) should be present in 100 mL
of the aqueous solution to give 0.1 normality ?
(a) 1 g
(b) 2g
(c) 10 g
(d) 20 g
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27.
How much water should be added to 200 cc of seminormal (0.5 N) solution of NaOH
to make it exactly decinormal (0.1N) ?
(a) 200 cc
(b) 400 cc
(c) 800 cc
(d) 600 cc
28.
What is the normality of 1 M solution of H3PO4 ?
(a) 0.5 N
(b) 1 N
(c) 2 N
(d) 3 N
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29.
Two solutions of a substance (non-electrolyte) are mixed in the following manner : 480
mL of 1.5 M first solution+ 520 mL of 1.2 M second solution. What is the molarity of
the final mixture ?
(a) 1.20 M
(b) 1.50 M
(c) 1.344 M
(d) 2.70 M
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Basic Concepts of Chemistry / 1_5_A/ Ph : 079-30004433
30.
15
The mole fraction of the solute in one molal aqueous solution is
(a) 0.009
(b) 0.018
(c) 0.027
(d) 0.036
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Basic Concepts of Chemistry / 1_5_A/ Ph : 079-30004433
1
BASIC CONCEPTS OF CHEMISTRY
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Basic Concepts of Chemistry / 1_5_A/ Ph : 079-30004433