Chemistry Test - 42

Among alkali metal ions, Li⁺ is the smallest. Therefore, it has the maximum degree of hydration than any other alkali metal cation.

Hence option A is the correct answer.

Both Li and Mg combine directly with N₂ to give nitrides Li₃Nand Mg₃N₂.

Bicarbonates of Li and Mg are more soluble in water than carbonates whereas carbonates of alkali metals are more soluble.

Hydroxides and nitrates of both Li and Mg decompose on heating to give oxide.

\(L i N O_{3} \stackrel{\Delta}{\rightarrow} L_{2} O+N O_{2}+O_{2}\)

\(M g\left(N O_{3}\right)_{2} \stackrel{\Delta}{\longrightarrow} M g O+N O_{2}+O_{2}\)

Magnesium always form basic carbonates while lithium form normal carbonates, it does not form basic carbonates.

Hence option D is the correct answer.

The rate of reaction of compound (R) is lower than that of compound (S) because in compound (R), the amide group is directly attached to benzene ring. It shows negative resonance effect.

The rate of reaction of compounds (P) and (Q) are lower than that of compound (S) because in compounds (P) and (Q), the −NHR or −NHCOR group is directly attached to benzene ring through N atom. It shows positive resonance effect.

Hence, the order of rate of electrophilic substitution reaction is Q>P>S>R.

Hence option A is the correct answer.

Na₂SO₄.10H₂O is glauber salt.

Na₂S₂O₃.5H₂O is hypo sodium thiosulphate.

CuSO₄.5H₂O is blue vitriol.

Na₂B₄O₇.10H₂O is borax.

Hence option A is the correct answer.

Based on the structure of the tertiary butyl iodide,IUPAC name is 2-Iodo 2-Methyl propane (3 carbon atoms are present in the longest chain and on second carbon there is one Methyl and one Iodo group is present)

Hence option D is correct.

All the alkali metal ion exists as hydrated ions M⁺(H₂O)_n in it's aqueous solution. The degree of hydration decreases as the ionic size increases when we go down the group. Since the mobility of ions is inversely proportional to the size of their hydrated ions, the increasing order of ionic mobility is

Hence option A is the correct answer.

Benzene contains carbon and hydrogen atoms.

Naphthalene contains carbon and hydrogen atoms.

Pyridine contains carbon, hydrogen and nitrogen atoms. So, it is a heterocyclic aromatic compound.

Hence option C is the correct answer.

The solvay process or ammonia soda process is used for the manufacture of sodium carbonate (Na₂CO₃.10H₂O).

Hence option B is the correct answer.

In Down's process, sodium metal is prepared by the electrolysis of fused NaCl.

Hence option A is the correct answer.

Due to relatively smaller ionic radius and high polarising power, Be differs in properties from other elements of its own group. Polarising powers of Be²⁺' and Al³⁺. ions are almost the same, thus they show similarities in their properties.

Hence option B is the correct answer.