6. Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

$1.$   Among the following, the correct statement is

$(A)$ Phosphates have no biological significance in humans

$(B)$ Between nitrates and phosphates, phosphates are less abundant in earth's crust

$(C)$ Between nitrates and phosphates, nitrates are less abundant in earth's crust

$(D)$ Oxidation of nitrates is possible in soil

$2.$   Among the following, the correct statement is

$(A)$ Between $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{NH}_3$ is better electron donor because the lone pair of electrons occupies spherical ' $\mathrm{s}$ ' orbital and is less directional

$(B)$ Between $\mathrm{NH}_5$ and $\mathrm{PH}_5, \mathrm{PH}_5$ is better electron donor because the lone pair of electrons occupies $\mathrm{sp}^3$ orbital and is more directional

$(C)$ Between $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{NH}_3$ is a better electron donor because the lone pair of electrons occupies $\mathrm{sp}^3$ orbital and is more directional

$(D)$ Between $\mathrm{NH}_3$ and $\mathrm{PH}_3, \mathrm{PH}_3$ is better electron donor because the lone pair of electrons occupies spherical ' $\mathrm{s}$ ' orbital and is less directional

$3.$  White phosphorus on reaction with $\mathrm{NaOH}$ gives $\mathrm{PH}_3$ as one of the products. This is a

$(A)$ dimerization reaction

$(B)$ disproportionation reaction

$(C)$ condensation reaction

$(D)$ precipitation reaction

Give the answer question $1,2$ and $3.$

(Rounded off to the nearest integer) [Assume : $\ln 10=2.303, \ln 2=0.693$ ]

$\mathop {C{H_3} - N{H_2}}\limits_{(P)} \,\,\,\,\,\,\,\,\,\,\,\mathop {Ph - N{H_2}}\limits_{(Q)} $

$(a)\,N{H_4}N{O_2}\xrightarrow{\Delta }{N_2} + {H_2}O$

$(b)\,N{H_4}N{O_3}\xrightarrow{\Delta }{N_2}O + {H_2}O$

$(c)\,N{a_2}C{O_3}\xrightarrow{\Delta }N{a_2}O + C{O_2}$

$(d)\,N{H_4}Cl\xrightarrow{\Delta }N{H_3} + HCl$