Q. The major product ($$B$$) in the given sequence of reactions is :

Q. A metal ($A$) on heating in nitrogen gas gives compound $B$. $B$ on treatment with $H_{2}O$ gives a colourless gas which when passed through $Cu{SO}_4$ solution gives a dark blue-violet coloured solution. $A$ and $B$ respectively, are :

1. $Mg$ and ${Mg}_3{N}_2$
2. $Na$ and $Na{NO}_3$
3. $Mg$ and $Mg{\left({NO}_3\right)}_2$
4. $Na$ and ${Na}_{3}N$

Q. Two monomers in maltose are :

1. $\alpha -D-$ glucose and $\alpha -D-$ Fructose
2. $\alpha -D-$ glucose and $\alpha -D-$ galactose
3. $\alpha -D-$ glucose and $\alpha -D-$ glucose
4. $\alpha -D-$ glucose and $\beta -D-$ glucose

Q. Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds ?

1. $C_6{H}_5{NH}_2$
2. $N{H}_2-\stackrel{O}{\stackrel{||}{C}}-N{H}_2$
3. $C_6{H}_5{NO}_2$
4. ${CH}_3{CH}_2-C\equiv N$

Q. Among the reactions (a) $-$ (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:

1. (a)
2. (a) and (d)
3. (c) and (d)
4. (d)