When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed redissolves in excess sodium hydroxide because
A. sodium is more reactive than zinc B. sodium hydroxide is a strong alkali C. zinc hydroxide is amphoteric D. zinc hydroxide is unstable Correct Answer: Option C C. zinc hydroxide is amphotericWhich of the following on burning in air contributes to acid rain?
A. Sulphur B. Magnesium C. Aluminium D. Zinc Correct Answer: Option A A. SulphurIf 20 cm³ of distilled water is added to 80 cm³ of 0.50 mol dm‾³ hydrochloric acid, the concentration of the acid will change to?
A. 20 mol dm‾³ B. 0.40 mol dm‾³ C. 2.00 mol dm‾³ D. 5.00 mol dm‾³ Correct Answer: Option B B. 0.40 mol dm‾³A colourless, odourless liquid T, gives effervesce with sodium trioxocarbonate (IV) and a white precipitate with silver trioxonitrate (V) solution T is most probably?
A. sodium chloride solution B. barium chloride solution C. dilute trioxonitrate (V) acid D. dilute hydroxide is unstable Correct Answer: Option C C. dilute trioxonitrate (V) acidProducts
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