Reaction of Metallic Oxides and Hydroxides with Acids

Q.

What would be the color of the solution when copper oxide and dilute hydrochloric acid are mixed?

Q.

${\mathrm{B}}_2{\mathrm{H}}_6$reacts with ${\mathrm{O}}_2$ and ${\mathrm{H}}_2\mathrm{O}$ respectively to form

1. ${\mathrm{B}}_2{\mathrm{O}}_3,{\mathrm{H}}_3{\mathrm{BO}}_3$

2. ${\mathrm{B}}_2{\mathrm{O}}_3,{\mathrm{BH}}_4^{-}$

3. ${\mathrm{HBO}}_2,{\mathrm{H}}_3{\mathrm{BO}}_3$

4. ${\mathrm{H}}_3{\mathrm{BO}}_3,{\mathrm{HBO}}_2$

Q. When metal oxides or metal hydroxides react with ___, they form salt and water.

Q.

Name from the list of substances given below, that would be used to prepare each of the salts named in parts (a) to (d).

(The substances are copper, lead, sodium, zinc, copper oxide, lead carbonate solution, $\mathrm{dil}.\mathrm{HCl}$, $\mathrm{dil}.{\mathrm{HNO}}_3$ and $\mathrm{dil}.{\mathrm{H}}_2{\mathrm{SO}}_4$)

(b) Copper Sulphate