Some Basic Concepts Of Chemistry Level-2 Exam

30 Questions | By Jhaanju0801 | Last updated: Mar 14, 2022 | Total Attempts: 58

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Some Basic Concepts Of Chemistry Level-2 Exam - Quiz

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.

Questions and Answers

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^-23cm³
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 ( N_A = 6.02 x 10²³mol^-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)₂will 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 H₂SO_4, 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)₂solution 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