1.
2.
3.
1.0 mole of CO2 contains:
(A) 6.02 ×1023 atoms of C
(B) 6.02 ×1023 atoms of O
(C) 18.1×1023 molecules of CO2
(D) 3 g-atoms of CO2
The largest number of molecule is in :
(A) 28 g of Co
(B) 46 g of C2 H 5OH
(C) 36 g of H 2O
(D) 54 g of N 2O5
Which of the following has the smallest number of molecules?
(A) 22.4 ×103 mL of CO2 gas
(B) 22 g of CO2 gas
(C) 11.2 litre of CO2 gas
(D) 0.1 mole of CO2 gas
5.
Volume of a mixture of 6.02 ×1023 oxygen atoms and 3.01×1023 hydrogen molecules at NTP is :
(A) 28.0 litre
(B) 33.6 litre
(C) 11.2 litre
(D) 22.4 litre
The number of molecules present in a drop of water, if it volume is 0.05 mL, are :
6.
(A) 1.66 ×1021
(B) 1.66 ×1022
(C) 1.66 ×1023
How many moles of electron weigh one kilogram?
4.
(D) 1.66 ×1024
1
1
6.023 ×1054
31
×10
×108
(A) 6.023 ×10
(B)
(C)
(D)
9.108
9.108
9.108 × 6.023
Which has maximum number of atoms?
(A) 24 g C(12)
(B) 56 g Fe(56)
(C) 27 g Al(27)
(D) 108 g Ag(108)
The number of hydrogen atoms present in 25.6 g of sucrose (C12 H 22O11 ) which has a molar mass of
23
7.
8.
342.3 g is :
9.
10.
11.
(A) 22 ×1023
(B) 9.91×1023
(C) 11×1023
The number of moles of a gas in 1 m3 of volume at NTP is :
(A) 4.46
(B) 0.446
(C) 1.464
(D) 44 ×1023
(D) 44.6
21
If 10 molecules are removed from 100 mg CO2 , then number of moles of CO2 left are :
(A) 6.10 ×10−4
(B) 2.8 ×10−3
(C) 2.28 ×10−3
Which of the following statement is incorrect?
108
×10−23 g
(A) One gram mole of silver equals
6.023
(B) One mole of CH 4 and 17 g of NH 3 at NTP occupy same volume
(D) 1.36 ×10−2
(C) One mole Ag weighs more than that of two moles of Ca.
(D) One gram mole of CO2 is 6.023 ×1023 times heavier than one molecule of CO2
12.
One atom of an element ' X ' weighs 6.664 ×10−23 gm. The number of gram atoms in 40 kg of it is:
(A) 10
(B) 100
(C) 10000
(D) 1000
13.
Number of electrons present in 3.6 mg of NH 4+ are :
14.
(A) 1.2 ×1021
(B) 1.2 ×1020
(C) 1.2 ×1022
(D) 2 ×10−3
In the reaction, 4 A + 2 B + 3C → A4 B2C3 , what will be the number of moles of product formed,
starting from 1 mol of A,0.6 mol of B and 0.72 mol of C?
(A) 0.25
(B) 0.3
(C) 0.24
(D) 2.32
15.
An electric discharge is passed through a mixture containing 50 cc of O2 and 50 cc of H2. The volume
of the gas formed:
16.
(i) At room temperature,
(ii) at 110o C will be :
(A) (i) 25 cc (ii) 50 cc (B) (i) 50 cc (ii) 75 cc
(C) (i) 25 cc (ii) 75 cc (D) (i) 75 cc (ii) 75 cc
The mass of carbon present in 0.5 mol of K 4[ Fe(CN )6 ] is:
17.
(A) 1.8 g
(B) 18 g
(C) 3.6 g
(D) 36 g
If 1 mL of water contains 20 drops. Then number of molecules in a drop of water is:
18.
(A) 6.023 ×1023
(B) 1.673 ×1021
(C) 1.344 ×1018
(D) 4.346 ×1020
Phosphine ( PH 3 ) decomposes to produce vapours of phosphorus and H 2 gas. What will be the
change in volume when 100 mL of phosphine is decomposed?
(A) +50 mL
(B) +500 mL
(C) +75 mL
19.
(D) -500 mL
If N A is Avogardro’s number then number of valence electron in 4.2 g of nitride ions ( N 3− ) is:
(A) 2.4 N A
(B) 4.2 N A
(C) 1.6 N A
(D) 3.2 N A
20.
Which one of the following has largest number of molecules?
(A) 34 g of water
(B) 28 g of carbon dioxide
(C) 46 g of methanol (D) 54 g of N 2O5
21.
One mole of CO2 contains:
(B) 18.1 x 10 23 molecules of CO 2
(A) 3 g-atoms of CO2
22.
(C) 6.02 x 10 23 O atoms
(D) 6.02 x 10 23 C atoms
Which of the following contains maximum number of atoms?
(A) 6.023 x 10 21 molecules of CO2
(B) 22.4 L of CO 2 at S.T.P
(C) 0.44 g of CO 2
(D) None of the above
23.
The weight of a molecule of the compound C60 H122 is:
24.
(A) 1.4 x 10 −21 g
(B) 1.09 x 10 −21 g
(C) 5.025 x 10 23 g
The maximum number of molecules is present in:
(C) 0.5 g of H 2 gas
(A) 15 L of H 2 at STP (B) 5 L of N 2 gas at STP
25.
26.
28.
29.
(D) 10 g of O 2 gas
For the formation of 3.65 g of hydrogen chloride gas, what volumes of hydrogen gas and chloride
gas are required at NTP conditions?
(A) 1.12 L, 1.12 L
(B) 1.12 L, 2.24 L
(C) 3.65 L, 1.83 L
(D) 1 L, 1 L
If 30 mL of H 2 and 20 mL of O2 reacts to form H 2O , what is left at the end of the reaction?
(A) 10 mL of H 2
27.
(D) 16.023 x 10 23 g
(B) 5 mL of H 2
(C) 10 mL of O 2
(D) 5mL of O 2
Which among the following is the heaviest?
(A) One mole of oxygen
(B) One molecule of sulphur trioxide
(C) 100 amu of uranium
(D) 10 moles of hydrogen
(E) 44 g of carbon dioxide
The incorrect statement for 14 g CO is:
1
(A) It occupies 2.24 L at NTP
(B) It corresponds to mole of CO
2
(C) IT corresponds to same mole of CO and N 2
(D) IT corresponds to 3.01 x 10 13 molecules of Co
The weight of iron which will be converted into its oxide ( Fe3O4 ) by the action of 18 g of stream on
it will be:
(A) 168 g
(B) 84 g
(C) 42 g
(D) 21 g
30.
31.
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g PbO and 3.2 g
HCl?
(A) 0.011
(B) 0.029
(C) 0.044
(D) 0.333
What mass of carbon monoxide has the same number of oxygen atom as are present in 22 g CO2 ?
32.
(A) 14 g
(B) 280 g
(C) 28 g
(D) 56 g
Number of atoms of oxygen present in 10.6 g of Na2CO3 will be:
(A) 6.02 ×1022
(B) 12.04 ×1022
(C) 1.806 ×1023
(D) 31.80 ×1028
33.
3.0 ×1022 atoms of X and 6.0 ×1022 atoms of Y are present in a compound. The empirical formula
is:
(C) XY3
(D) X 2Y3
(A) XY
(B) XY2
34.
9.6 ×1017 atoms of iron weight as much as 1 cm 3 of H 2 at STP. What is the atomic mass of iron?
35.
(A) 26
(B) 55.7
(C) 56.0
The no. of electrons present in 18 mL of water is:
36.
(A) 6.02 ×1025
(B) 6.02 ×1023
(C) 6.02 ×1024
(D) None of these
The number of water molecules in 1 liter of water is ( N A represents Avogadro number):
(A) 18
37.
(B) 18 × 1000
(D) 58.6
(C) N A
(D) 55.5 N A
The number of atoms present in 0.1 mole of P4 (atomic mass = 31 ) are:
(A) 2.4 ×1024 atoms (B) Same as in 0.05 mole of S8 (C) Same as in 3.2 g of sulphur (D) None of these
38.
Volume occupied by one molecule of water (density = 1 g cm −3 ) is:
(A) 9.0 ×10−23 cm 3
39.
(D) 5.5 ×10−23 cm 3
The weight of 1×1022 molecules of CuSO4 .5H 2O (atomic mass of Cu = 63.5 u) is:
(A) 42.42 g
40.
(B) 6.023 ×10−23 cm 3 (C) 3.0 ×10−23 cm 3
(B) 41.42 g
(C) 44.44 g
24
(D) 48.94 g
The number of gram molecules of oxygen in 6.02 ×10 CO molecules is:
(A) 10 g molecules
(B) 5 g molecules
(C) 1 g molecules
(D) 0.5 g molecules