Question

Read the paragraph carefully and answer the questions given below. (5)
A brown coloured copper powder was placed in a china dish and was strongly heated in air
when a compound 'X' is formed. The compound X was insoluble in water but dissolved in
dilute hydrochloric acid forming a greenish solution without evolution of any gas.
i. The chemical formula of compound 'X' is
a. CuO b. Cu2O
c. CuO2 d. Cu2O3
ii. The category of the reaction involved is
a. substitution b. combination
c. double displacement d. dissociation reaction
iii. Chemical formula of greenish solution obtained is
a. 2 Cu(OH) b. CuSO4
c. CuCl 2 d. none of the above
iv. Method used to get copper powder back from X is
a. Exothermic b. Reduction of X
c. Oxidation of X d. Electrolysis of X
v. The compound X has colour
a. Red b. Green
c. Blue d. Black

Answer 1

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