Q. No.For the reaction:
\(Cl_2 + KOH \rightarrow KCl + KClO + H_2O\)
1 mole of \(Cl_2\) passed into 2 litre, 2M solution of KOH. Determine the molarity of \(Cl^-, ClO^-\) and \(OH^-\) respectively.
1. 1 M, 0.5 M, 0.5 M
2. 0.5 M, 0.5 M, 1 M
3. 1 M, 1 M, 0.5 M
4. 0.5 M, 1 M, 0.5 M
\(Cl_2 + KOH \rightarrow KCl + KClO + H_2O\)
1 mole of \(Cl_2\) passed into 2 litre, 2M solution of KOH. Determine the molarity of \(Cl^-, ClO^-\) and \(OH^-\) respectively.
1. 1 M, 0.5 M, 0.5 M
2. 0.5 M, 0.5 M, 1 M
3. 1 M, 1 M, 0.5 M
4. 0.5 M, 1 M, 0.5 M
Subtopic: Moles, Atoms & Electrons | Concentration Based Problem | Equation Based Problem |
66%
Level 2: 60%+
Please attempt this question first.
Hints
100 g of 98% by weight \(H_2SO_4\) is mixed with 100 gm of 49% by weight \(H_2SO_4 .\) Determine the mole fraction of \(H_2SO_4\) in the final solution:
1. 0.9
2. 0.1
3. 0.67
4. 0.33
1. 0.9
2. 0.1
3. 0.67
4. 0.33
Subtopic: Moles, Atoms & Electrons | Concentration Based Problem |
53%
Level 3: 35%-60%
Please attempt this question first.
Hints
36 g of A reacts with 56 g of B to form AB₂ according to the following reaction:
A + 2B → AB₂ . Which of the following statements is correct?
(Given: Molar mass of A = 60 g mol⁻¹ and molar mass of B = 80 g mol⁻¹)1. The molecular mass of AB₂ is 140 g mol⁻¹.
2. A is the limiting reagent.
3. 15 gm of A remains unreacted.
4. The mass of AB₂ formed is 132 g.
Subtopic: Moles, Atoms & Electrons | Limiting Reagent | Equation Based Problem |
75%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
For Balanced chemical reaction:
Which of the following is correct?
| \(2 \mathrm{Al}_{(\mathrm{s})}+6 \mathrm{HCl}_{\mathrm{aq}} \rightarrow 2 \mathrm{AlCl}_3+3 \mathrm{H}_{2(\mathrm{~g})}\) |
Which of the following is correct?
| 1. | With excess of Al, volume of \(H_2\) gas produced per mole of HCl reacted will be 33.6 L at 1 atm & 273 K. |
| 2. | With excess of Al, volume of \(H_2\) gas produced per mole of HCl reacted will be 11.2 L at 1 atm & 273 K. |
| 3. | With excess of HCI, moles of \(AlCl_3\) produced per mole of AI reacted are 2. |
| 4. | At given P and T, 12 L HCI produced 6 L \(H_2 \) gas. |
Subtopic: Moles, Atoms & Electrons | Concentration Based Problem |
75%
Level 2: 60%+
Please attempt this question first.
Hints
2.8 × 10–3 mol of CO2 is left after removing 1021 molecules from its ‘x’ mg sample. The mass of CO2 taken initially is:
(Given : \(\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}\))
(Given : \(\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}\))
| 1. | 196.2 mg | 2. | 98.3 mg |
| 3. | 150.4 mg | 4. | 48.2 mg |
Subtopic: Moles, Atoms & Electrons |
65%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following mixtures of 1M base and 1M acid leads to the largest increase in temperature?
1. 30 mL HCl and 30 mL NaOH
2. 30 mL CH3COOH and 30 mL NaOH
3. 50 mL HCl and 20 mL NaOH
4. 45 mL CH3COOH and 25 mL NaOH
1. 30 mL HCl and 30 mL NaOH
2. 30 mL CH3COOH and 30 mL NaOH
3. 50 mL HCl and 20 mL NaOH
4. 45 mL CH3COOH and 25 mL NaOH
Subtopic: Moles, Atoms & Electrons | Concentration Based Problem | Millimole/Equivalent Concept |
67%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
Moles of \(\text{CH}_4\) required for the formation of 22 gm of \(\text{CO}_2\) is \(\text{m}\times10^{-2}.\)
The value of m is:
1. 50
2. 67
3. 90
4. 78
The value of m is:
1. 50
2. 67
3. 90
4. 78
Subtopic: Moles, Atoms & Electrons |
85%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
A hydrocarbon has a molar mass of 84 g/mol and contains 85.8% carbon by mass. How many hydrogen atoms are present in one molecule of this hydrocarbon?
1. 8
2. 10
3. 12
4. 14
1. 8
2. 10
3. 12
4. 14
Subtopic: Moles, Atoms & Electrons |
74%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
Elements A and B form two compounds, A₂B and AB₃, with equal weights for 0.15 moles of each compound. What is the ratio of the molar atomic mass of element A and element B?
c
c
| 1. | 2 : 1 | 2. | 6 : 4 |
| 3. | 1 : 2 | 4. | 4 : 6 |
Subtopic: Moles, Atoms & Electrons |
64%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
Given 645 g of a compound \(C_6H_5N_3O_6\) . The number of N atoms present in this compound is:
Report x if your answer is \(x \times 10^{21} \)
\((C=12, H=1, N=14, O=16)\left(N_{A}=6.02 \times 10^{23}\right) \)
1. 5418
2. 5671
3. 5212
4. 5781
Subtopic: Moles, Atoms & Electrons |
75%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
© 2026 GoodEd Technologies Pvt. Ltd.