Chemistry

Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound [Cu=64, F = 96500 Cmol-1]

A. 32395.5 B. 30156.3 C. 60784.5 D. 15196.5 Correct Answer: Option B = 30156.3 Explanation Cu → Cu²+ + 2e…

5 years ago

The oxidizing agent in the reaction below is?

H2O (g) + C (s) → H2(g) + CO(g) A. CO(g) B. C(s) C. H2O(g) D. H2 (g) Correct Answer:…

5 years ago

In the reaction below, the oxidation number of the reducing agent changes from?

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) A. 0 to + 4 B. 0 to + 2 C. + 1…

5 years ago

Which of the following salts will turn blue litmus red?

A. Sodium tetrahydroxozincate (ll) B. Potassium hydrogentetraoxosulphate (lV) C. Sodium trioxocarbonate (lV) D. Zinc chloride hydroxide Correct Answer: Option B…

5 years ago

The mathematical expression of pH is?

A. log10[OH-] B. log 101/[H3O+] C. log10[H3O+] D. log101/[OH -] Correct Answer: Option B = log 101/[H3O+]

5 years ago

The colour of litmus in a neutral medium is?

A. purple B. pink C. yellow D. orange Correct Answer: Option A - purple

5 years ago

The basicity of CH3COOH is?

A. 4 B. 1 C. 2 D. 3 Correct Answer: Option B = 1

5 years ago

The major and most effective way of controlling pollution is to?

A. improve machinery so that the substances released from combustion are less harmful B. pass strict laws against it by…

5 years ago

The dispersion of a liquid in a liquid medium will give?

A. an emulsion B. a fog C. a gel D. an aerosol Correct Answer: Option A - an emulsion

5 years ago

16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20°C, calculate the solubility of the solute in moldm-³ [Pb = 207, N = 14, O = 16]

A. 0.05 g B. 2.00 g C. 1.00 g D. 0.50g Correct Answer: Option D = 0.50g Explanation molar mass…

5 years ago
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