Reactions with Metals

Q. The electrolysis of $Ba(OH{)}_2$ yields at the anode.

1. $C{O}_2$
2. $BaO$
3. $H_2$
4. $O_2$

Q.

Choose terms from the options given in brackets to complete these sentences.

(a) When CuO reacts with hydrogen, .............. is reduced and ............... is oxidized to .............. . $(CuO,H_2,Cu,H_{2}O)$

(b) Hydrogen is ................ soluble in water. (Sparingly, highly, moderately)

(c) Metals like ................., ................. and ................ give $H_2$ with steam.

(iron, magnesium, aluminium, sodium, calcium)

(d) Sodium .......... reacts smootly with cold water. (metal, amalgam, in the molten state)

(e) A metal ............. hydrogen in the activity series gives hydrogen with ............... acid or acid.

(above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric).

Q. Noble metals are dissolved in :

1. conc. HNO${}_3$
2. conc. HCl
3. conc H${}_2$SO${}_4$
4. aqua regia

Q. Upon electrolysis of 2 litres of pure water, litre(s) of $O_2$ gas is/are liberated.

1. 1
2. 2
3. 3

Q.

Explain, how dilute Sulfuric acid acts? [Hint: Typical acid]

Q. The electrolysis of $Ba(OH{)}_2$ yields at the anode.

1. $C{O}_2$
2. $BaO$
3. $H_2$
4. $O_2$