Chemistry

A quantity of electricity liberates 3.6g of Silver from its salt. What mass of aluminium will be liberated from its salt by the same quantity of electricity? [Al = 27, Ag = 108].

A. 2.7g B. 1.2g C. 0.9g D. 0.3g Correct Answer: Option A = 2.7g

5 years ago

Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of Sand, water and methanoic acid?

A. Fractional distillation B. Filtration followed by distillation C. Neutralization with sodium hydroxide followed by distillation D. Neutralization with sodium…

5 years ago

Which of the following pairs of substances will react further with oxygen to form a higher oxide?

A. CO2 and H2O B. NO and H2O C. CO and CO2 D. SO2 and NO Correct Answer: Option D…

5 years ago

The boiling of fat and aqueous caustic soda is referred to as?

A. hydrolysis B. esterification C. acidification D. saponification Correct Answer: Option D - saponification

5 years ago

What the effect of the experiment on the litmus paper at initial level?

A. be bleached B. turn green C. turn red D. turn blue Correct Answer: Option D

5 years ago

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be?

A. 2.2M B. 1.1M C. 0.22M D. 0.11M Correct Answer: Option C = 0.22M

5 years ago

The periodic classification is an arrangement of the elements?

A. atomic weights B. isotopic weights C. molecular weights D. atomic numbers Correct Answer: Option D - atomic numbers Explanation…

5 years ago

Which of the following statements is correct about the periodic table?

A. Elements in the same period have the same number of valence electrons B. The valence electrons of the elements…

5 years ago

On which of the following is the solubility of a gaseous substance-dependent?

I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure A. I, II, III and IV B. I…

5 years ago

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that?

A. collisions are perfectly elastic B. forces of repulsion exist C. forces of repulsion and attraction are in equilibrium D.…

5 years ago
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