Chemistry

C(s) + 2S(g) → CS2(g) ΔH = +89 kJ mol-1. The chemical equation implies that?

A. each of carbon and sulphur has 89 kJ of energy B. both carbon and sulphur contribute 89 kJ of…

4 years ago

Ethanoic acid is?

A. tribasic B. unionizeable C. monobasic D. dibasic Correct Answer: Option C - monobasic

4 years ago

What current in amperes will deposit 2.7g of aluminium in 2 hours? [Al = 27, F = 96 500 Cmol−¹]

A. 32 B. 8 C. 4 D. 16 Correct Answer: Option C Explanation Al3+ + 3e → Al 3 *…

4 years ago

Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises?

A. The bonds in the reacting molecules are more readily broken B. The molecular collisions become more violent C. A…

4 years ago

A metal M displaces zinc from zinc chloride solution. This shows that?

A. M is more electronegative than zinc B. Zinc is above hydrogen in the series C. M is more electropositive…

4 years ago

P(g) + Q(g) ↔ 3R(s) + S(g) ΔH is negative. Which of the following will increase the yield of R?

A. Using a larger close vessel B. Increasing the temperature C. Removing some S D. Adding a positive catalyst Correct…

4 years ago

In which of the following reactions does reduction takes place

A. Fe2+ + e- → Fe3+ B. 2O2- →O2 + 4e- C. Cr – 2e- → Cr2+ D. 2H+ + 2e- → H2 Correct Answer: Option…

4 years ago

Phosphorus is stored under water to prevent it from?

A. Dehydrating B. Becoming inert C. Smelling D. Catching fire Correct Answer: Option D - Catching fire

4 years ago

The chemical used for coagulation in water purification is?

A. Aluminium tetraoxosulphate (VI) B. Copper tetraoxosulphate (VI) C. Sodium tetraoxosulphate (VI) D. Calcium tetraoxosulphate (VI) Correct Answer: Option A…

4 years ago

Environmental pollution is worsened by the release from automobile exhausts of?

A. Water vapour B. Steam C. Smoke D. Heavy metals Correct Answer: Option C - Smoke

4 years ago
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