Chapter 14

Alkali metals are characterized by 1\. good conductor of heat and electricity 2\. high oxidation potentials 3\. high melting point 4\. solubility in liquid ammonia (a) 1,2 (b) \(2,3,4\) (c) \(1,2,4\) (d) all of these

Which of the following orders are correct? 1\. stability of \(+3\) oxidation state decrease as \(\mathrm{B}>\mathrm{Al}>\) \(\mathrm{Ga}>\mathrm{In}>\mathrm{Tl}\) 2\. stability of hydrides of group 13 element decreases as \(\mathrm{B}>\mathrm{Al}>\mathrm{Ga}>\mathrm{In}>\mathrm{T} 1\) 3\. reducing nature of group 13 elements decreases as \(\mathrm{Al}>\mathrm{Ga}>\mathrm{In}>\mathrm{Tl}\) (a) \(\mathrm{I}\) and 2 (b) 1 and 3 (c) 2 and 3 (d) 1,2 and 3

120\. Match the following: List I 1\. thermal stability 2\. acidic nature 3\. boiling points 4\. \(\angle \mathrm{MMH}\) bond angle List II (i) \(\mathrm{H}_{2} \mathrm{~S}<\mathrm{H}_{2} \mathrm{Se}<\mathrm{H}_{2} \mathrm{Te}<\mathrm{H}_{2} \mathrm{PO}\) (ii) \(\mathrm{H}_{2} \mathrm{O}>\mathrm{H}_{2} \mathrm{~S}>\mathrm{H}_{2} \mathrm{Se}>\mathrm{H}_{2} \mathrm{Te}\) (iii) \(\mathrm{H}_{2} \mathrm{~S}<\mathrm{H}_{2} \mathrm{Se}<\mathrm{H}_{2} \mathrm{Te}<\mathrm{H}_{2} \mathrm{O}\) (iv) \(\mathrm{H}_{2} \mathrm{~S}>\mathrm{H}_{2} \mathrm{Se}>\mathrm{H}_{2} \mathrm{Te}=\mathrm{H}_{2} \mathrm{PO}\) The correct matching is 2 (a) (iii) (ii) (i) (iv) (b) (iv) (i) (ii) (iii) (c) (ii) (i) (iii) (iv) (d) (i) (ii) (iii) (iv) 121\. Which of the following order is incorrect? (1) \(\mathrm{PH}_{3}<\mathrm{AsH}_{3}<\mathrm{SbH}_{3}<\mathrm{NH}_{3}\) (Melting point) (2) \(\mathrm{PH}_{3}<\mathrm{AsH}_{3}<\mathrm{NH}_{3}<\mathrm{SbH}_{3}\) (Boiling point) (3) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}>\mathrm{BiH}_{3}\) (Dipole moment) (a) only (b) only 2 (c) both (1) and (2) (d) none is incorrect here 122\. Match the following: List I List II 1\. most electronegative (i) I 2\. most electron affinity (ii) At 3\. liquid halogen (iii) \(\mathrm{F}_{2}\) 4\. radio active halogen (iv) \(\mathrm{Cl}_{2}\) (v) \(\mathrm{Br}_{2}\)

Which of the following order is incorrect? (1) \(\mathrm{PH}_{3}<\mathrm{AsH}_{3}<\mathrm{SbH}_{3}<\mathrm{NH}_{3}\) (Melting point) (2) \(\mathrm{PH}_{3}<\mathrm{AsH}_{3}<\mathrm{NH}_{3}<\mathrm{SbH}_{3}\) (Boiling point) (3) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}>\mathrm{BiH}_{3}\) (Dipole moment) (a) only 1 (b) only 2 (c) both (1) and (2) (d) none is incorrect here

Match the following: List I List II 1\. most electronegative (i) \(\mathrm{I}_{2}\) \(2 .\) most electron affinity (ii) At 3\. liquid halogen (iii) \(\mathrm{F}_{2}\) 4\. radio active halogen (iv) \(\mathrm{Cl}_{2}\) (v) \(\mathrm{Br}_{2}\)

The incorrect statement/s among the following is /are (a) \(\mathrm{NCl}_{5}\) does not exist while \(\mathrm{PCl}_{5}\) does (b) Lead prefers to form tetravalent compounds (c) The three C-O bonds are not equal in the carbonate ion (d) Both \(\mathrm{O}_{2}^{+}\)and \(\mathrm{NO}\) are paramagnetic

Which of the following halogens does not turn starch iodine paper blue? (a) \(\mathrm{I}_{2}\) (b) \(\mathrm{F}_{2}\) (c) \(\mathrm{Cl}_{2}^{2}\) (d) \(\mathrm{Br}_{2}\)

Which among the following statements is/are correct here: (a) He and Ne do not form clathrate (b) \(\mathrm{XeF}_{4}\) and \(\mathrm{SbF}_{5}\) combine to form salt (c) He has highest boiling point in its group (d) He diffuses through rubber and polyvinyl chloride

Select the incorrect statement about Buckyball or Buckminister fullerene? (a) It is an allotrope of carbon. (b) It is referred as C-60 and C-70. (c) In it carbon atoms are sp \(^{3}\) hybridised. (d) It is inert like diamond.

Which one of the following arrangements do not truely represent the property indicated against it? (a) \(\mathrm{Br}_{2}<\mathrm{Cl}_{2}<\mathrm{F}_{2}-\) Electronegativity (b) \(\mathrm{Br}_{2}<\mathrm{Cl}_{2}<\mathrm{F}_{2}-\) Bond energy (c) \(\mathrm{Br}_{2}<\mathrm{Cl}_{2}<\mathrm{F}_{2}-\) Electron affinity (d) \(\mathrm{Br}_{2}<\mathrm{Cl}_{2}<\mathrm{F}_{2}-\) oxidizing power

Which of the following noble gases do not form any compound? (a) \(\mathrm{Kr}\) (b) \(\mathrm{He}\) (c) \(\mathrm{Xe}\) (d) \(\mathrm{Ne}\)

Which of the following names can be used for group VIII A elements? (a) Rare-earths (b) Inert gases (c) Rare gases of atmosphere (d) Noble gases

Which of the following compounds contain boron? (a) Colemanite (b) Kernite (c) Borax (d) Cristoballite

Which of the following will displace the halogen from the solution of the halide? (a) \(\mathrm{Cl}_{2}\) added to a KBr solution (b) \(\mathrm{Br}_{2}\) added to an \(\mathrm{NaCl}\) solution (c) \(\mathrm{Br}_{2}\) added to a KI solution (d) \(\mathrm{Cl}_{2}\) added to an \(\mathrm{NaF}\) solution

Graphite is a (a) Good conductor of electricity (b) Good insulator (c) Bad conductor of heat (d) Good conductor of heat

Chlorine behaves as an oxidizing agent upon reaction with (a) \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{NaNO}_{2}\) (c) \(\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) (d) \(\mathrm{O}_{3}\)

Select the incorrect statement: (a) Fluorine cannot show oxidation number greater than zero (b) Halogens do not directly combine with oxygen (c) Iodine can not displace chlorine from \(\mathrm{KClO}_{3}\) (d) Euchlorine is a mixture of \(\mathrm{Cl}_{2}\) and \(\mathrm{Cl}_{2} \mathrm{O}_{7}\)

Which of the following are bent? (a) \(\mathrm{Br}_{3}^{+}\) (b) \(\mathrm{I}_{-}^{-}\) (c) \(\mathrm{I}_{3}^{+}\) (d) \(\mathrm{F}_{3}^{-}\)

Which of the following pairs is/are correctly matched here: (a) The strongest oxidizing agent - Iodine (b) The most reactive halogen - Fluorine (c) A halogen which is liquid at room temperature-Bromine (d) The most electronegative element-Fluorine

Which of the following statements are correct for the \(\mathrm{P}_{4}\) molecule? (a) Its reacts with nitrogen to form a phosphorous nitrogen polymer (b) The electron affinity of phosphorous is negative (c) The P-P bond distance are equal (d) The P-P-P bond angles are \(60^{\circ}\).

Among the following, the correct statement is (a) Between \(\mathrm{NH}_{3}\) and \(\mathrm{PH}_{3}, \mathrm{NH}_{3}\) is a better electron donor because the lone pair of electrons occupies spherical 's' orbital and is less directional (b) Between \(\mathrm{NH}_{3}\) and \(\mathrm{PH}_{3}, \mathrm{PH}_{3}\) is a better electron donor because the lone pair of electrons occupies \(s p^{3}\) 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 \(s p^{3}\) orbital and is less directional (d) Between \(\mathrm{NH}_{3}\) and \(\mathrm{PH}_{3}, \mathrm{PH}_{3}\) is a better electron donor because the lone pair of electrons occupies spherical 's' orbital and is less directional

White phosphorus on reaction with \(\mathrm{NaOH}\) gives \(\mathrm{PH}_{3}\) as one of the products. This is a (a) Dimerization reaction (b) Disproportional reaction (c) Condensation reaction (d) Precipitation reaction

Among the oxyacids of the type HXO \(_{3}\), the weakest acid would be (a) \(\mathrm{HBrO}_{3}\) (b) \(\mathrm{HIO}_{3}\) (c) \(\mathrm{HClO}_{3}\) (d) al the three will be of same strength

Match the following Column-I (Allotropic form) (a) Engel's sulphur (b) \(\chi-\) sulphur (c) Rhombic sulphur (d) \(\gamma\)-monoclinic | Column-II (Structure) | | :--- | | (p) Crystalline form- | | yellow crystals | | (q) Fibrous or rubber like | | (r) Puckered S_(8) rings | | (crown configuration) | | (s) S_(4) rings, chair | | conformation, | | unstable |

Match the following Column-I (a) Boron (b) Carbon (c) Silicon (d) Phosphorous Column-II (p) Amphoteric oxide (q) Acidic oxide (r) Catenation (s) Allotropy

Match the following Column-I (a) \(\mathrm{F}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{Br}_{2}\) (d) \(\mathrm{I}_{2}\) Column-II (p) Metallic lusture (q) Most electronegative (r) Highest bond energy (s) Reddish liquid

Match the following Column-I (a) Diamond (b) Graphite (c) Fullerene (d) Norbide Column-II (p) sp^{2} - h y b r i d i s a t i o n (q) sp \(^{3}\)-hybridisation (r) Tetrahedral (s) Carbide

Match the following Column-I (a) \(\mathrm{F}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{Br}_{2}\) (d) I, Column-II (p) pale yellow coloured gas (q) violet colour solid (r) orange red liquid (s) greenish coloured gas

Match the following (a) \(\mathrm{F}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{Br}_{2}\) (d) \(\mathrm{I}\), Column-II (p) Oxidizing nature (q) Reaction with dil or conc. \(\mathrm{NaOH}\) (r) Pale greenish yellow (s) No bleaching action

Match the following Column-I (a) Oxygen (b) Sulphur (c) Nitrogen (d) Chlorine Column-II (p) Octa atomic (q) Diatomic (r) Paramagnetic (s) Diamagnetic

\(\mathrm{PCl}_{3}\) and \(\mathrm{PCl}_{5}\) both exists; \(\mathrm{NCl}_{3}\) exists but \(\mathrm{NCl}_{4}\) does not exist. It is due to (a) lower electronegativity of P than \(\mathrm{N}\) (b) lower tendency of \(\mathrm{N}\) to form covalent bond (c) availability of vacant d orbital in \(\mathrm{P}\) but not in \(\mathrm{N}\) (d) statement is itself incorrect

Which one of the following substances has the highest proton affinity? [2003] (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{H}, \mathrm{O}\) (c) \(\mathrm{PH}_{3}\) (d) \(\mathrm{H}_{2} \mathrm{~S}\)

The solubilities of carbonates decrease down the magnesium group due to thedecrease in [2003] (a) inter ionic interaction (b) lattice energies of solids (c) entropy of solution formation (d) hydration energies of cations

The solubilities of carbonates decrease down the magnesium group due to a decrease in [2003] (a) lattice energies of solids (b) hydration energies of cations (c) entropy of solution formation (d) inter ionic attraction

Which one of the following ion has the highest value of ionic radius? (a) \(\mathrm{F}^{-}\) (b) \(\mathrm{O}^{2-}\) (c) \(\mathrm{B}^{3+}\) (d) \(\mathrm{Li}^{+}\)

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point? (a) \(\mathrm{LiCl}\) (b) \(\mathrm{NaCl}\) (c) \(\mathrm{KCl}\) (d) \(\mathrm{RbCl}\)

The correct order of the thermal stability of hydrogen halides \((\mathrm{H}-\mathrm{X})\) is (a) \(\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}>\mathrm{HI}\) (b) \(\mathrm{HI}>\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}\) (c) \(\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\) (d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}\)

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which one of these statements gives the correct picture? (a) the reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group (b) in both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group (c) chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens (d) in alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

The ionic mobility of alkali metal ions in aqueous solution is maximum for (a) \(\mathrm{K}^{+}\) (b) \(\mathrm{Rb}^{+}\) (c) \(\mathrm{Li}^{+}\) (d) \(\mathrm{Na}^{+}\)

The decreasing values of bond angles from \(\mathrm{NH}_{3}\) \(\left(106^{\circ}\right)\) to \(\mathrm{SbH}_{3}\left(101^{\circ}\right)\) down group 15 of the periodic table is due to (a) increasing bp-bp repulsion (b) increasing \(\mathrm{p}\) orbital character in \(\mathrm{sp}^{3}\) (c) decreasing lp-bp repulsion (d) decreasing electronegativity

The stability of dihalides of \(\mathrm{Si}\), Ge, \(\mathrm{Sn}\) and \(\mathrm{Pb}\) increases steadily in the sequence \(\quad\) [2007] (a) \(\mathrm{SiX}_{2}<\mathrm{GeX}_{2}<\mathrm{PbX}_{2}<\operatorname{Sn} \mathrm{X}_{2}\) (b) \(\mathrm{SiX}_{2}^{2}<\mathrm{GeX}_{2}^{2}<\mathrm{SnX}_{2}^{2}<\mathrm{Pb} \mathrm{X}_{2}^{2}\) (c) \(\mathrm{PbX}_{2}^{2}<\operatorname{Sn} \mathrm{X}_{2}^{2}<\mathrm{GeX}_{2}^{2}<\mathrm{SiX}_{2}^{2}\) (d) \(\mathrm{GeX}_{2}<\mathrm{SiX}_{2}<\mathrm{SnX}_{2}<\mathrm{PbX}_{2}\)

In which of the following arrangements, the sequence is not strictly according to the property written against it? \(\quad\) (a) \(\mathrm{HF}<\mathrm{HCl}<\mathrm{HBr}<\mathrm{HI}\) : increasing acid strength (b) \(\mathrm{NH}_{3}<\mathrm{PH}_{3}<\mathrm{AsH}_{3}<\mathrm{SbH}_{3}:\) increasing basic strength (c) \(\mathrm{B}<\mathrm{C}<\mathrm{O}<\mathrm{N}\) : increasing first ionization enthalpy (d) \(\mathrm{CO}_{2}<\mathrm{SiO}_{2}<\mathrm{SnO}_{2}<\mathrm{PbO}_{2}\) : increasing oxidising power

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? (a) \(\mathrm{Na}_{2} \mathrm{O}<\mathrm{K}_{2} \mathrm{O}<\mathrm{MgO}<\mathrm{Al}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{Al}_{2} \mathrm{O}_{3}<\mathrm{MgO}<\mathrm{Na}_{2} \mathrm{O}<\mathrm{K}_{2} \mathrm{O}\) (c) \(\mathrm{MgO}^{3}<\mathrm{K}_{2} \mathrm{O}<\mathrm{Al}_{2} \mathrm{O}_{3}<\mathrm{Na}_{2} \mathrm{O}\) (d) \(\mathrm{K}_{2} \mathrm{O}<\mathrm{Na}_{2} \mathrm{O}<\mathrm{Al}_{2} \mathrm{O}_{3}<\mathrm{MgO}\)

Which of the following statement is wrong? (a) Single \(\mathrm{N}-\mathrm{N}\) bond is weaker than the single \(\mathrm{P}-\mathrm{P}\) bond (b) Nitrogen cannot form \(\mathrm{d} \pi-\mathrm{p} \pi\) bond (c) The stability of hydrides increases from \(\mathrm{NH}_{3}\) to \(\mathrm{BiH}_{3}\) in group 15 of the periodic table. (d) \(\mathrm{N}_{2} \mathrm{O}_{4}\) has two resonance structures.

The molecule having smallest bond angle is (a) \(\mathrm{SbCl}_{3}\) (b) \(\mathrm{AsCl}_{3}\) (c) \(\mathrm{NCl}_{3}\) (d) \(\mathrm{PCl}_{3}\)

Which of the following represents the correct order of increasing first ionization enthalpy for \(\mathrm{Ca}, \mathrm{Ba}, \mathrm{S}, \mathrm{Se}\) and Ar? (a) \(\mathrm{Ba}<\mathrm{Ca}<\mathrm{Se}<\mathrm{S}<\mathrm{Ar}\) (b) \(\mathrm{Ca}<\mathrm{Ba}<\mathrm{S}<\mathrm{Sr}<\mathrm{Ar}\) (c) \(\mathrm{Ca}<\mathrm{S}<\mathrm{Ba}<\mathrm{Se}<\mathrm{Ar}\) (d) \(\mathrm{S}<\mathrm{Se}<\mathrm{Ca}<\mathrm{Ba}<\mathrm{Ar}\)