Some Basic Concepts Of Chemistry Level-2 Exam
This exam contains total 30 questions. For each correct answer you will be awarded +4 marks. For each wrong answer -1 marks will be deducted. For non-attempted questions, you will be given 0 marks. Choose your answers wisely because of NEGATIVE MARKING. Review yours answers before submitting. Time Allotted is 1 hour. Manage time effectively.
- 1.The molarity of solution obtained by mixing 200 mL 0.1 M HCl with 300 mL 0.2 M HCl solution will be -
- A.
0.08 M
- B.
0.20 M
- C.
0.06 M
- D.
0.16 M
- 2.A gaseous hydrocarbon gives upon combustion, 0.72 g H2O and 3.08 g CO2. The empirical formula of the hydrocarbon is-
- A.
C2H4
- B.
C3H4
- C.
C6H5
- D.
C7H8
- 3.Number of atoms in 560 g Fe (atomic mass of Fe = 56 g/mol) is
- A.
Twice that of 70 g N
- B.
Half that of 20 g H
- C.
Both (a) and (b)
- D.
None of these
- 4.Given P = 0.0030 m , Q = 2.40 m , R = 3000 m . The significant figures for P,Q and R are respectively
- A.
2, 2, 1
- B.
2, 3, 4
- C.
4, 2, 1
- D.
4, 2, 4
- 5.The element chlorine consists of a mixture of 75.53 % 17Cl35 and 24.47 % 17Cl37 having masses of 34.97 amu and 36.95 amu respectively. The atomic weight of chlorine is
- A.
35.25
- B.
35.45
- C.
36.25
- D.
36.45
- 6.A reaction is given as follows: SnO2 + C → Sn + CO Its balanced form will involve
- A.
2C and 2CO
- B.
C and 3CO
- C.
C and 2CO
- D.
2C and CO
- 7.Cl2 reacts completely with 0.4 gram H2 to yield HCl. The amount of HCl formed is-
- A.
7.3 grams
- B.
10.7 grams
- C.
14.4 grams
- D.
16.7 grams
- 8.The maximum number of molecules is present in-
- A.
5 L of N2 gas at STP
- B.
0.5 g of H2 gas
- C.
10 g of O2 gas
- D.
15 L of H2 gas at STP
- 9.Volume occupied by one molecule of water (density = 1 g/cm3) is-
- A.
3.0 x 10-23 cm3
- B.
5.5 x 10-23 cm3
- C.
9.0 x 10-23 cm3
- D.
6.023 x 10-23 cm3
- 10.10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction is-
- A.
1 mol
- B.
2 mol
- C.
3 mol
- D.
4 mol
- 11.The number of atoms in 0.1 mol of a triatomic gas is ( NA = 6.02 x 1023 mol-1)
- A.
1.800 x 1022
- B.
6.026 x 1022
- C.
1.806 x 1023
- D.
3.600 x 1023
- 12.Which has the maximum number of molecules among the following-
- A.
64 g SO2
- B.
44 g CO2
- C.
48 g O3
- D.
8 g H2
- 13.How many moles of magnesium phosphate Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
- A.
2.5 x 10-2
- B.
0.02
- C.
3.125 x 10-2
- D.
1.25 x 10-2
- 14.Which of the following pairs of compounds illustrates the law of multiple proportions?
- A.
H2O , Na2O
- B.
MgO , Na2O
- C.
Na2O , BaO
- D.
SnCl2 , SnCl4
- 15.In the reaction N2 + 3H2 → 2NH3 Ratio by volume of N2, H2 and NH3 is 1:3:2. This illustrates law of-
- A.
Definite proportion
- B.
Multiple proportion
- C.
Reciprocal proportion
- D.
Gay Lussac
- 16.When 100 g of ethylene polymerizes to polythene according to the equation- n CH2=CH2 → -(-CH2 - CH2 -)n The weight of polythene produced will be-
- A.
N/2 grams
- B.
100 grams
- C.
100/n grams
- D.
100n grams
- 17.Vapour density of ammonia is 8.5, 85 grams of NH3 at STP will occupy-
- A.
22.4 litre
- B.
112 litre
- C.
224 litre
- D.
1120 litre
- 18.If 3.01 x 1020 molecules are removed from 98 mg of H2SO4, then the number of moles of H2SO4 left are-
- A.
0.1 x 10-3
- B.
0.5 x 10-3
- C.
1.66 x 10-3
- D.
9.95 x 10-2
- 19.The total number of ions present in 1 mL of 0.1 M barium nitrate Ba(NO3)2 solution is-
- A.
6.02 x 1018
- B.
7.2 x 1021
- C.
3.0 x 6.02 x 1019
- D.
3.0 x 6.02 x 1018
- 20.A person adds 1.71 gram of sugar (C12H22O11) in order to sweeten his tea. The number of carbon atoms added are- (Molecular mass of sugar = 342 g/mol)
- A.
3.6 x 1022
- B.
7.2 x 1021
- C.
0.05
- D.
6.6 x 1022
- 21.In a gaseous reaction of the type- aA + bB → cC + dD Identify the wrong statement.
- A.
A litre of A combines with b litre of B to give C and D
- B.
A mole of A combines with b mole of B to give C and D
- C.
A gram of A combines with b gram of B to give C and D
- D.
A molecules of A combines with b molecules of B to give C and D
- 22.A compound is found to contain 80% carbon and 20% hydrogen. Which of the following is that compound?
- A.
C6H6
- B.
C2H5OH
- C.
C2H6
- D.
C2H4
- 23.For the reaction given below- A + 2B → C 5 moles of A and 8 moles of B will produce -
- A.
5 moles of C
- B.
4 moles of C
- C.
8 mole of C
- D.
13 mole of C
- 24.Molecular weight of tribasic acid is W. Its equivalent weight will be-
- A.
W/2
- B.
W/3
- C.
W
- D.
3W
- 25.According to the following reaction- 2Al + 1.5O2 → Al2O3 9 gms of Al will react completely with-
- A.
6 gms of O2
- B.
8 gms of O2
- C.
9 gms of O2
- D.
4 gms O2
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