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BASIC CONCEPTS OF CHEMISTRY
A pure substance can only be :
(a) A compound
(b) an element
(c) an element or a compound
(d) a heterogeneous mixture
A pure substance which contains only one type of atoms is called :
(a) an element
(b) a compound
(c) A solid
(d) a liquid
Carbon burns in oxygen to form carbon dioxide. The properties of carbon dioxide
are :
(a) completely different from carbon and oxygen
(b) more similar to carbon than oxygen
(c) similar to oxygen
(d) similar to carbon
Which one of the following statements is correct ?
(a) All elements are heterogeneous
(b) Compounds always contains one kind of atoms
(c) A mixture is always heterogeneous
(d) All above statements are incorrect
One sample of air is found to have 0.05% carbon dioxide and another sample 0.3%.
this illustrates that :
(a) air is an element
(b) air is homogeneous mixture
(c) air is a heterogeneous
(d) air does not follow the law of constant proportions mixture
Which one of the phrases would be incorrect to use ?
(a) A mole of an element
(b) A mole of a compound
(c) An atom of an element
(d) An atom of a compound
A symbol not only represents the name of the element but also its :
(a) atomic mass
(b) atomic number
(c) atomicity
(d) atomic volume
significant figures in 0.00051 are :
(a) 5
(b) 3
(c) 2
(d) 4
The number of significant figures in 6.02 × 1023 is :
(a) 23
(b) 3
(c) 4
(d) 26
Express 0.006006 into scientific notation in three significant digits :
(a) 6.01 × 10–3
(b) 6.006 × 10–3
(c) 6.00 × 10–3
(d) 6.0 × 10–3
The proper value of significant figures in 38.0 + 0.0035 + 0.00003 is :
(a) 38
(b) 38.0035
(c) 38.00353
(d) 38.0
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
12.
How many moles of electron weigh one kilogram ? [IIT(Screening) 2002]
1
(a) 6.023 × 1023
(b)
× 10 31
9.108
6.923 × 10 54
1
(c)
(d)
× 10 8
9.108
9.108 × 6.023
13.
Given the numbers : 161 cm; 0.161 cm; 0.0161 cm. The number of significant figure
for three numbers is :
[AFMC (Pune) 2002]
(a) 3, 4, 5
(b) 3, 3, 3
(c) 3, 3, 4
(d) 3, 4, 4
Which of the following pairs of substance illustrate the low of multiple proportions
[CPMT 1972, 78]
(a) SO2 and SO3
(b) P2O3 and P2O5
(c) Both
(d) None
After a chemical reaction, the total ass of reactants and products
[MP PMT 1989]
(a) Is always increased
(b) Is always decreased
(c) Is not changed
(d) Is always less or more
The percentage of Lead and oxygen in samples of Pb2O3 obtained by different
methods were found to be the same. This illustrates the law of …[AMU 1982-92]
14.
15.
16.
2
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
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(a) Constant proportions
(b) Conservation of mass
(c) Multiple proportions
(d) Reciprocal proportions
Two samples of Copper oxide were separately reduced to metallic copper by heating
in a current of hydrogen. The weight of copper from one oxide was half the weight of
copper obtained from the other oxide. The data illustrates…
[AMU 1983]
(a) Law of reciprocal proportions
(b) Law of constant proportions
(c) Law of multiple proportions
(d) Law of equivalent proportions
Chemical equation is balanced according to the law of
[AMU 1984]
(a) Multiple proportion
(b) Reciprocal proportion
(c) Conservation of mass
(d) Definite proportions
Different proportions of oxygen in the various oxides of nitrogen prove the
[MP PMT 1985]
(a) Equivalent proportion
(b) Multiple proportion
(c) Constant proportion
(d) Conservation of matter
A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon
and 72.73% oxygen. The data support [AIIMS 1992]
(a) Law of constant composition
(b) Law of conservation of mass
(c) Law of reciprocal proportions
(d) Law of multiple proportions
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
21.
Sulphur forms the chlorides S2Cl2 and SCl2. The equivalent mass of suphur in SCl2 is
[EAMCET 1985; Pb. CET 2001]
(a) 8 g/mol
(b) 16 g/mol
(c) 64.8 g/mol
(d) 32 g/mol
22.
The sulphate of a metal M contains 9.8% of M. This sulphate is isomorphous with
ZnSO4, 7H2O. The atomic weight of M is…
[IIT 1991]
(a) 40.3
(b) 36.3
(c) 24.3
(d) 11.3
23.
Which one of the following properties of an element is not variable…
[Bihar MADT 1981]
(a) Valency
(b) Atomic weight
(c) Equivalent weight
(d) All of these
Total number of atoms represented by the compound CuSO4 , 5H2O is…[BHU 2005]
24.
4
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
25.
26.
5
(a) 27
(b) 21
(c) 5
(d) 8
74.5g of a metallic chloride contains 35.5g of chlorine. The equivalent weight of the
metals is…
[CPMT 1986]
(a) 19.5
(b) 35.5
(c) 39.0
(d) 78.0
The percentage of an element M is 53 in its oxide of molecular formula M2O3. Its
atomic mass is about…
[Kerala PET 2008]
(a) 45
(b) 9
(c) 18
(d) 36
(e) 27
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
27.
6
A metal M of equivalent mass E forms an oxide of molecular formula MxOy, The
atomic mass of the metal is given by the correct equation… [Kerala PMT 2008]
(a) 2E(y/x)
(b) xyE
(c) E/y
(d) y/E
(e) E/2(x/y)
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
28.
7
Equivalent weight of crystalline oxalic acid is (H2C2O4, 2H2O)…[MP PMT 1995]
(a) 30
(b) 63
(c) 53
(d) 45
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
29.
8
The equivalent weight of an element is 4. Its chloride has a V.D. 59.25. Then the
valency of the element is
[BHU 1997]
(a) 4
(b) 3
(c) 2
(d) 1
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
30.
9
The oxide of a metal has 32% oxygen. Its equivalent weight would be
[MP PMT 1985; WB JEE 2008]
(a) 34
(b) 32
(c) 17
(d) 8
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
31.
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…
[AIEEE 2005]
(a) Decrease twice
(b) Increase two fold
(c) Remain unchanged
(d) Be a function of the molecular mass of the substance
32.
Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen,
number of atoms of nitrogen in one molecule of caffeine is
(a) 4
(b) 6
(c) 2
(d) 3
10
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
33.
In an experiment, it is found that 2.0769 g of pure X produces 3.679 g of pure X2O5.
The number of moles of X is
(a) 0.04
(b) 0.06
(c) 0.40
(d) 0.02
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Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
34.
If Al, Zn and Fe scraps have the same rate per kg. then for the production of H2 by
action of dilute H2SO4 [Atomic mass of Al = 27, Zn = 65, Fe = 56]
(a) Fe will be cheapest and Al will be costliest
(b) Al will be cheapest and zinc will be costliest
(c) Fe will be cheapest and zinc will be costliest
(d) Zn will be cheapest and Al will be costliest
35.
Sulphur trioxide is prepared by the following two reactions.
S8(s) + 8 O2(g) → 8 SO2(g) and 2 SO2(g) + O2(g) → 2 SO3(g)
How many grams of SO3 are produced from 1 mol of S8 ?
(a) 1280.0
(b) 640. 0
(c) 960.0
(d) 320.0
12
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
36.
12 L of H2 and 11.2 litres of Cl2 are mixed and exploded. The composition by volume
of mixture is …(Hint : H2 + Cl2 → 2 HCl)
(a) 24 L Cl2 and 20.8 L HCl
(b) 0.8 L Cl2 and 20 L HCl
(c) 0.8 L H2 and 22.4 L HCl
(d) 22.4 L HCl
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Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
37.
If 0.5 mol of BaCl2 is mixed with 0.2 mol of Na3PO4 the maximum number of
Ba3(PO4)2 that can be formed is
(a) 0.7
(b) 0.5
(c) 0.3
(d) 0.1
38.
Approximate atomic mass of an element is 26.89. If its equivalent mass is 8.9, the
exact atomic mass of the element is :
(a) 26.89
(b) 8.9
(c) 17.8
(d) 26.7
39.
When an element form an oxide in which oxygen is 20% of the oxide by mass, the
equivalent mass of the element will be :
(a) 32
(b) 40
(c) 60
(d) 128
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Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
40.
15
If 1.2g of a metal displaces 1.12 litre of hydrogen at NTP, equivalent mass of the
metal would be :
(a) 1.2 × 11.2
(b) 12
(c) 24
(d) 1.2 + 11.2
Basic Concepts of Chemistry / 1_4_A / Ph : 079-30004433
1
BASIC CONCEPTS OF CHEMISTRY
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