Chapter 15

Metal hydride on treatment with water gives (a) hydrogen (b) acid (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\)

Hydrogen from HCl can be prepared by (a) \(\mathrm{P}\) (b) \(\mathrm{Mg}\) (c) \(\mathrm{Hg}\) (d) \(\mathrm{Cu}\)

Hydrogen will not reduce (a) heated cupric oxide (b) heated ferric oxide (c) heated stannic oxide (d) heated aluminium oxide

Reaction of potassium with water is (a) hydrolysis (b) absorption (c) exothermic (d) endothermic

A metal which does not liberate \(\mathrm{H}_{2}(\mathrm{~g})\) from acids is (a) \(\mathrm{Fe}\) (b) \(\mathrm{Zn}\) (c) \(\mathrm{Mn}\) (d) \(\mathrm{Cu}\)

Which gas is liberated, when alkaline formaldehyde solution is treated with \(\mathrm{H}_{2} \mathrm{O}_{2} ?\) (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{O}_{2}\)

Ortho and para hydrogen differ (a) in the molecular weight (b) in the number of protons (c) in the nature of spin of electrons (d) in the nature of spin of protons

Hydrogen burns in air or oxygen with (a) invisible pale blue flame (b) red flame (c) golden flame (d) blue flame

Which of the following cannot be oxidized by \(\mathrm{H}_{2} \mathrm{O}_{2} ?\) (a) \(\mathrm{O}_{3}\) (b) \(\mathrm{PbS}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) (d) \(\mathrm{Kl}+\mathrm{HCl}\)

There are three isotopes of hydrogen and three naturally occurring isotopes of oxygen \(\left(\mathrm{O}^{16}, \mathrm{O}^{17}\right.\) and \(\mathrm{O}^{18}\) ). How many kinds of water are possible? (a) 9 (b) 16 (c) 8 (d) 18

The boiling point of water is exceptionally high because (a) there is covalent bond between \(\mathrm{H}\) and \(\mathrm{O}\) (b) water molecule is not linear (c) water molecule is linear (d) water molecules associate due to hydrogen bonding

The \(\mathrm{H}^{-\mathrm{O}-\mathrm{H} \text { angle in water molecule is about }}\) (a) \(90^{\circ}\) (b) \(105^{\circ}\) (c) \(135^{\circ}\) (d) \(180^{\circ}\)

Action of water or dilute mineral acids on metals can give (a) tritium (b) dihydrogen (c) trihydrogen (d) mono hydrogen

Water is oxidized to oxygen by (a) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (b) \(\mathrm{KMnO}_{4}\) (c) \(\mathrm{ClO}_{2}\) (d) fluorine

The reagent commonly used to determine hardness of water titrimetrically is (a) disodium salt of EDTA (b) sodium thiosulphate (c) sodium citrate (d) oxalic acid

The chemical formula of zeolite is ..... (a) \(\mathrm{Na}_{2} \mathrm{Al}_{2} \mathrm{Si}_{2} \mathrm{O}_{\mathrm{g}} \cdot \mathrm{xH}_{2} \mathrm{O}\) (b) \(\mathrm{Na}_{2}\left(\mathrm{Na}_{4}\left(\mathrm{PO}_{3}\right)_{6}\right.\) (c) \(\mathrm{Ca}_{2} \mathrm{Al}_{2} \mathrm{Si}_{2} \mathrm{O}_{8}\) (d) \(\mathrm{K}_{2} \mathrm{Al}_{2} \mathrm{Si}_{2} \mathrm{O}_{8} \times \mathrm{H}_{2} \mathrm{O}\)

Which one of the following statements about the zeolite is false? (a) They have open structure which enables them to take up small molecules (b) They are used as cation exchangers (c) Zeolites are aluminosilicates having three dimensional network (d) None of the \(\mathrm{SiO}_{4}^{4-}\) units are replaced by \(\mathrm{AlO}_{4}^{5-}\) and \(\mathrm{AlO}_{6}{\underline{\phantom{xx}}}^{9}\) ions in zeolites

Which one of the following compounds undergo hydrolysis during distillation to yield hydrogen peroxide? (a) \(\mathrm{HNO}_{3}\) (b) \(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}\) (c) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (d) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\)

The reagent used in the detection of fluoride in water is \(\ldots \ldots\) (a) Phenolphthalein (b) Zirconium-alizarin \(\mathrm{S}\) (c) Soda lime (d) Bayer's reagent

The products formed when heavy water reacts with magnesium nitride, are \(\ldots .\) (a) \(\mathrm{ND}_{3}, \mathrm{Mg}(\mathrm{OD})_{2}\) (b) \(\mathrm{ND}_{3}, \mathrm{Mg}(\mathrm{OH})_{2}\) (c) \(\mathrm{NH}_{3}, \mathrm{Mg}(\mathrm{OH})_{2}\) (d) \(\mathrm{NH}_{3}, \mathrm{Mg}(\mathrm{OD})_{2}\)

Water softening by Clarke's process uses (a) potash alum (b) calcium bicarbonate (c) calcium hydroxide (d) sodium bicarbonate

By which of the following process permanent hardness of water can be removed? (a) washing soda (b) soda lime (c) sodium chloride (d) sodium bicarbonate

When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together? (a) van der Waals forces (b) covalent attraction (c) ionic interaction (d) hydrogen bond formation

\(\mathrm{H}_{2} \mathrm{O}_{2}\) exists as .... in alkaline medium. (a) \(\mathrm{HO}_{2}+\) (b) \(\mathrm{H}_{2} \mathrm{O}+\) (c) \(\mathrm{HO}_{2}-\) (d) \(\mathrm{O}_{2}^{2}-\)

Structure of \(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) planar (b) linear (c) non planar (d) three dimensional

The \(\mathrm{H}-\mathrm{O}-\mathrm{O}\) bond angle in \(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) \(97^{\circ}\) (b) \(106^{\circ}\) (c) \(104.5^{\circ}\) (d) \(109.28^{\circ}\)

A variety of water which contains soluble salts of \(\mathrm{Ca}\) and \(\mathrm{Mg}\) is known as (a) soft water (b) heavy water (c) conductivity water (d) hard water

Which of the following is reduced by hydrogen peroxide in acidic medium? (a) ferrous sulphate (b) potassium iodide (c) potassium ferrocyanide (d) potassium permanganate

In which of the following reactions does hydrogen peroxide acts as a reducing agent? (a) \(2 \mathrm{KI}+\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{I}_{2}+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Ag}_{2} \mathrm{O}\) (moist) \(+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{Ag}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}\)

In which of the following reactions does \(\mathrm{H}_{2} \mathrm{O}_{2}\) acts as a reducing agent? (a) \(\mathrm{PbO}_{2}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \longrightarrow \mathrm{PbO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})\) \(+\mathrm{O}_{2}(\mathrm{~g})\) (b) \(\mathrm{KNO}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \longrightarrow \mathrm{KNO}_{3}(\mathrm{aq})+\) \(\mathrm{H}_{2} \mathrm{O}(\mathrm{l})\) (c) \(2 \mathrm{KI}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \longrightarrow 2 \mathrm{KOH}(\mathrm{aq})+\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \stackrel{\mathrm{I}_{2}(\mathrm{~s})}{\longrightarrow} \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})\) \(+\overline{\mathrm{H}}_{2} \mathrm{O}(\mathrm{l})\)

Aluminium reacts with concentrated \(\mathrm{HCl}\) and concentrated \(\mathrm{NaOH}\) to liberate the gases \(\ldots \ldots\) respectively. (a) \(\mathrm{H}_{2}\) and \(\mathrm{H}_{2}\) (b) \(\mathrm{O}_{2}\) and \(\mathrm{O}_{2}\) (c) \(\mathrm{O}_{2}\) and \(\mathrm{H}_{2}\) (d) \(\mathrm{H}_{2}\) and \(\mathrm{O}_{2}\)

For decolourization of one mole of \(\mathrm{KMnO}_{4}\) the number of moles of \(\mathrm{H}_{2} \mathrm{O}_{2}\) required are (a) \(1 / 2\) (b) \(3 / 2\) (c) \(5 / 2\) (d) \(7 / 2\)

A commercial sample of hydrogen peroxide is labelled as 10 volume, its percentage strength is (a) \(1 \%\) (b) \(3 \%\) (c) \(10 \%\) (d) \(90 \%\)

Which of the properties of interstitial hydrides is correct? (a) They give rise to metals fit for fabrication (b) They generally form non-stoichiometric species (c) They can be used as hydrogenation catalysts (d) The hydrogen dissolved in titanium improves its mechanical properties

The value of \(\ldots \ldots \ldots\) is less for \(\mathrm{D}_{2} \mathrm{O}\) compared to that of \(\mathrm{H}_{2} \mathrm{O}_{2}\) (a) boiling point (b) latent heat of vaporization (J \(\mathrm{g}^{-1}\) ) (c) density \(\left(\mathrm{g} / \mathrm{mL}^{-1}\right)\) at \(20^{\circ} \mathrm{C}\) (d) dielectric constant at \(20^{\circ} \mathrm{C}\)

Which of the following is not correct regarding the electrolytic preparation of \(\mathrm{H}_{2} \mathrm{O}_{2}\) ? (a) sulphuric acid undergoes oxidation (b) hydrogen is liberated at anode (c) \(50 \% \mathrm{H}_{2} \mathrm{SO}_{4}\) is used (d) lead is used as cathode

The reaction of \(\mathrm{H}_{2} \mathrm{O}\) with \(\mathrm{X}\) does not liberate gaseous product. Which of the following is \(X\) ? (a) \(\mathrm{PbO}_{2}\) (b) \(\mathrm{KMnO}_{4} / \mathrm{H}^{+}\) (c) \(\mathrm{PbS}\) (d) \(\mathrm{Cl}_{2}\)

It is possible to obtain oxygen from air by fractional distillation because (a) oxygen has a lower density than nitrogen (b) oxygen has high boiling point than nitrogen (c) oxygen is more reactive than nitrogen (d) oxygen is in a different group of the periodic table from nitrogen.

Oxygen does not react with (a) \(\mathrm{Na}\) (b) \(\mathrm{P}\) (c) \(\mathrm{Cl}\) (d) \(\mathrm{S}\)

The absorption of ultraviolet radiation by \(\mathrm{O}_{3}\) (a) makes both the function effective (b) makes no function effective (c) maintains an equilibrium between the concentrations of \(\mathrm{O}_{2}\) and \(\mathrm{O}_{3}\) (d) protects the inhabitants of out planet from injurious radiation

About \(20 \mathrm{~km}\) above the earth, is the ozone layer. Which one of the following statements about ozone and ozone layer is true? (a) conversion of \(\mathrm{O}_{3}\) to \(\mathrm{O}_{2}\) is an endothermic reaction (b) it is beneficial to us as it stops ultraviolet radiation (c) ozone has a triatomic linear molecule (d) it is harmful as it stops useful radiations

Which one of the following pairs of reactant does not form oxygen when they react with each other? (a) \(\mathrm{Cl}_{2}, \mathrm{NaOH}\) solution (cold, dilute) (b) \(\mathrm{F}_{2}, \mathrm{NaOH}\) solution (hot, concentrated) (c) \(\mathrm{F}_{2}, \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaOCl}_{2}, \mathrm{H}_{2} \mathrm{SO}_{4}\) (dilute)

Which of the following is not correct? (a) ozone is used to identify the presence of unsaturation in alkenes (b) sodium thiosulphate reacts with iodine to form sodium suphate (c) iodine oxidizes sodium thiosulphate to sodium tetrathionate (d) sodium thiosulphate is soluble in water

Nitrogen is a relatively inactive element because (a) dissociation energy of its molecule is fairly high (b) its electronegativity is fairly high (c) it has low atomic radius (d) its atom has a stable electronic configuration

Which of the following statements is not correct for nitrogen? (a) its molecular size is small (b) it is a typical non-metal (c) \(\mathrm{d}\) orbitals are available for bonding (d) its electronegativity is very high

Number of electrons shared in the formation of nitrogen molecule is (a) 10 (b) 8 (c) 6 (d) 2

The molecular nitrogen is not reactive due to (a) small inter-nuclear distance of \(\mathrm{N}\) atom (b) triple bond in \(\mathrm{N}\) atom (c) double bond in \(\mathrm{N}\) atom (d) high electronegativity of \(\mathrm{N}\)

\(\mathrm{N}\) forms \(\mathrm{NCl}_{3}\) whereas \(\mathrm{P}\) can form both \(\mathrm{PCl}_{3}\) and \(\mathrm{PCl}_{5}\). Why? (a) \(\mathrm{N}\) atoms is larger than \(\mathrm{P}\) in size (b) \(\mathrm{P}\) has low lying \(3 \mathrm{~d}\) orbitals, which can be used for bonding but \(\mathrm{N}\) does not have \(3 \mathrm{~d}\) orbitals in its valence shell (c) \(\mathrm{P}\) is more reactive towards \(\mathrm{Cl}\) than \(\mathrm{N}\) (d) None of these

Nitrogen is liberated by the thermal decomposition of only (a) \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (b) \(\mathrm{NaN}_{3}\) (c) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (d) all the three

Which of the following is not correct? (a) Nitric oxide in solid state exhibits diamagnetic property. (b) \(\mathrm{NH}_{3}\) is a weak reducing agent compared to \(\mathrm{PH}_{3}\) (c) Hydrolysis of \(\mathrm{NCl}_{3}\) gives \(\mathrm{NH}_{3}\) and \(\mathrm{HOCl}\) (d) \(\mathrm{NH}_{3}\) is less stable than \(\mathrm{PH}_{3}\)