5. What happens when
(i) Sodium reacts with water?
(ii) Calcium reacts with hydrochloric acid?
(iii) Zinc reacts with sodium hydroxide solution?
(iv) Carbon reacts with water?
(v) Sulphur reacts with dilute hydrochloric acid?
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Answers
Explanation:
(1)Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
(2) Calcium metal dissolves readily in dilute or concentrated hydrochloric acid to form solutions containing the aquated Ca(II) ion together with hydrogen gas, H2.
(3) Zinc react with excess sodium hydroxide to form sodium zincate(Na2ZnO2) along with hydrogen gas. Zinc is a transition metal which shows moderate reactivity. Zinc reacts with NaOH to form sodium zincate with the evolution of hydrogen gas.
(4) Carbon, either as graphite or diamond does not react with water under normal conditions. ... The resulting gas is called water gas and is a mixture of hydrogen (H2, 50%), carbon monoxide (CO, 40%), carbon dioxide (CO2, 5%), nitrogen and methane (N2 + CH4, 5%).
(5) You can react sulfur powder with hydrochloric acid (HCl) at room temperature. The reaction products will be sulfur chloride and hydrogen gas. Hope this helps answer your question.