Chapter 11

The laboratory test "tailing of mercury" is applied to identify (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (a) \(\mathrm{O}_{2}\)

The species that does not contain peroxide ions is (b) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (c) \(\mathrm{SrO}_{2}\) (d) \(\mathrm{BaO}_{2}\) (a) \(\mathrm{PbO}_{2}\)

The salt which is least likely to be found in mineral is (a) Chloride (b) Sulpiare (c) Sulphide (d) Nitrate

The gases absorbed by alkaline pyrogallol and \(\mathrm{CCl}_{4}\) are respectively (b) \(\mathrm{O}_{3}, \mathrm{O}_{2}\) (c) \(\mathrm{O}_{2}, \mathrm{~N}_{2}\) (d) \(\mathrm{O}_{3}, \mathrm{~N}_{2}\) (a) \(\mathrm{O}_{2}, \mathrm{O}_{3}\)

Adsorbed hydrogen by palladium is known as (d) Heavy (a) Atomic (b) Nascent (c) Occluded

Aluminum is most abundant in earth crust yet it is obtained from bauxite because (a) bauxite contains maximum aluminum (b) bauxite is available in large quantity (c) bauxite is less impure (d) aluminum can be easily extracted from bauxite

In the extraction of nickel by Mond's process, the metal is obuained by (a) Electrochemical reduction (b) Thermal decomposition (c) Chemical reduction by aluminum (d) Reduction by carbon

Hydrogen is evolved by the action of cold dil. \(\mathrm{HNO}_{3}\) on (a) \(\mathrm{F}\) (b) \(\mathrm{Mg}\) (c) \(\mathrm{Cu}\) (d) \(\overrightarrow{\mathbf{A l}}\)

In the extraction of iron, \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) is reduced by (a) carbon dioxide (b) aluminum (c) carbon and carbon monoxide (d) electrolytic reduction

What is the degree of hardness of a sample of water containing \(2 \mathrm{mg}\) of \(\mathrm{MgCl}_{2}\) in \(1 \mathrm{Kg}\) of it? (a) \(1.05 \mathrm{ppm}\) (b) \(3.15 \mathrm{ppm}\) (c) \(2.10 \mathrm{ppm}\) (d) \(4.20 \mathrm{ppm}\)

\(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) Diamagnetic (b) Paramagnetic (c) Ferromagnetic (d) None of these

Of the following metals, the one which cannot be obtained by the electrolysis of the aqueous solution of its salt is. (a) \(\overline{\mathrm{Ag}}\) (b) \(\overline{\mathrm{Mg}}\) (c) \(\mathrm{Cu}\) (d) \(\overline{H g}\)

Fluorine reacts with water to form (a) fluorine water (b) oxygen (c) ozone (d) oxygen and ozone

Gravity separation process is used for the concentration of (a) calamine (b) haematite (c) chalcopyrite (d) bauxite

The decay product of tritium is (a) \({ }_{1}^{1} \mathrm{H}\) (b) \({ }_{1}^{2} \mathrm{H}\) (c) \({ }_{2}^{3} \mathrm{He}\) (d) \(\frac{4}{2} \mathrm{He}\)

Tritium undergoes radioactive decay giving (a) \(\alpha\)-particles (b) \(\beta\)-particles (c) Neutrons (d) \(\bar{\chi}_{\text {rays }}\)

Refining of silver is done by (a) Liquation (b) Poling (c) Cupellation (d) van Arkel method

Ortho and para hydrogen differ (a) In the number of protons (b) In the molecular mass (c) In the nature of spins of protons (d) In the nature of spins of electrons

What is the degree of hardness of a sample of water containing \(6 \mathrm{mg}\) of \(\mathrm{MgSO}_{4}\) in \(1 \mathrm{~kg}\) of it? (a) \(5 \mathrm{ppm}\) (b) \(10 \mathrm{ppm}\) (c) \(15 \mathrm{ppm}\) (d) \(20 \mathrm{ppm}\)

Which gas is passed through in Merck's process for making hydrogen peroxide ? (a) \(\mathrm{CO}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{O}_{3}\)

Calcination is the process of heating the ore (a) in inert gas (b) in the presence of air (c) in the absence of air (d) in the presence of \(\mathrm{CaO}\) and \(\mathrm{MgO}\)

The temporary hardness of water due to calcium bicarbonate can be removed by adding (a) \(\mathrm{CaCO}_{3}\) (b) \(\mathrm{CaCl}_{2}\) (c) \(\mathrm{HC}\) (d) \(\mathrm{Ca}(\mathrm{OH})_{2}\)

Blister copper is obtained in (a) Bessemer converter (b) Blast furnace (c) Muffle furnace (d) Reverberatory process

Which is true peroxide ? (a) \(\mathrm{KO}_{2}\) (b) \(\mathrm{K}_{2} \mathrm{O}_{2}\) (c) \(\mathrm{MnO}_{2}\) (d) \(\mathrm{PbO}_{2}\)

Which of the following minerals contains both \(\mathrm{Mg}\) and \(\mathrm{Ca}\) ? (a) Dolomite (b) Gypsum (c) Epsomite (d) Tale

When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to the formation of (a) \(\mathrm{CrO}_{3}\) (b) \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{CrO}_{5}\) (d) \(\mathrm{CrO}_{4}^{2-}\)

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is (a) \(1: 1\) (b) \(1: 2\) (c) \(2: 1\) (d) \(9: 4\)

In the froth-floatation process, the sulphide ores are concentrated by mixing the ore with (a) Water, pine oil and sodium ethyl xanthate (b) Water, wax and benzene (c) Water, benzene and sodium ethy! xanthate (d) Water, matrix and air

Hydrogen can be prepared by the action of dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) on (a) Copper (b) Iron (c) Lead (d) Mercury

Calamine is an ore of (a) magnesium (b) calcium (c) lead (d) zinc

The compound that can work both as an oxidizing agent and reducing agent is (a) \(\mathrm{KMnO}_{4}\) (b) \(\mathrm{H}_{2} \mathrm{~S}\) (c) \(\mathrm{BaO}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\)

Flux is used to (a) Remove all impurities from ores (b) Reduce metal oxide (c) Remove silica \(\mathrm{R}\) (d) Remove silica and undesirable metal oxide

Pure water can be obtained from sea water by (a) Centrifugation (b) Plasmolysis (c) Reverse osmosis (d) Sedimentation

The chief source of iodine, in which it is present as sodium iodate, is (a) Carnalite (b) Sea weeds (c) Caliche (d) Iodine never exists as sodium iodate

Water softening by Clarke's process uses (a) Calcium bicarbonate (b) Sodium bicarbonate (c) Potash Alum (d) Calcium hydroxide

In which of the following mineral aluminum is not present? (a) Cryolite (b) Mica (c) Feldspar (d) Fluorspar

The percentage by weight of hydrogen in \(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) \(5.88\) (b) \(6.25\) (c) 25 (d) 50

The metal which cannot be obtained by electrolysis of aqueous solution of its salts is (a) \(\mathrm{Ag}\) (b) \(\mathrm{Zn}\) (c) \(\overline{\mathrm{Cu}}\) (d) \(\overline{\mathrm{Al}}\)

When electric current is passed through an ionic hydride in molten state (a) hydrogen is liberated at anode (b) hydrogen is liberated at cathode (c) hydride ion migrates towards cathode (d) hydride ion remains in solution

The hardness of water sample containing \(0.002 \mathrm{~mol}\) of magnesium sulphate dissolved in a litre is expressed as (a) \(20 \mathrm{ppm}\) (b) \(200 \mathrm{ppm}\) (c) 2000 ppm (d) \(120 \mathrm{ppm}\)

The method of zone refining of metals is based on the principle of (a) Greater mobility of the pure metal than that of the impurity (b) Higher melting point of the impurity than that of the pure metal (c) Greater noble character of the solid metal than that of the impurity (d) Greater solubility of the impurity in the molten state than in the solid

Number of H-bonds formed by a water molecule is (a) 2 (b) 8 (c) 1 (d) \(\overline{4}\)

Nickel is purified by thermal decomposition of its (a) Hydride (b) Chloride (c) Azide (d) Carbonyl

The maximum possible number of hydrogen bonds a water molecule can form in ice is (a) 1 (b) 2 (c) 3 (d) 4

The most abundant element in the earth's crust (by weight) is (a) \(\mathrm{Si}\) (b) \(\mathrm{Al}\) (c) \(\mathrm{O}\) (d) Fe

\(\mathrm{Pb}\) and \(\mathrm{Sn}\) are extracted from their chief ore by (a) Carbon reduction and self reduction (b) Self reduction and carbon reduction (c) Electrolysis and self reduction (d) Self reduction and electrolysis

HCl is added to the following oxides. Which one would give \(\mathrm{H}_{2} \mathrm{O}_{2}\) ? (a) \(\mathrm{MnO}_{2}\) (b) \(\mathrm{PbO}_{2}\) (c) \(\mathrm{BaO}\) (d) None of these

Cryolite is (a) \(\mathrm{Na}_{y} \mathrm{AIF}_{6}\) and is used in the electrolysis of alumina for decreasing electrical conductivity (b) \(\mathrm{Na}_{3} \mathrm{AlF}_{6}\) and is used in the electrolysis of alumina for lowering the melting point of alumina (c) \(\mathrm{Na}_{3} \mathrm{AIF}_{6}\) and is used in the electrolytic purification of alumina (d) \(\mathrm{Na}_{3} \mathrm{AIF}_{6}\) and is used in the electrolysis of alumina

For completely reacting with \(400 \mathrm{~mL}\) of \(1 \mathrm{~N}\) acidified \(\mathrm{KMnO}_{4}\) solution, what volume of a 10 volume sample of \(\mathrm{H}_{2} \mathrm{O}_{2}\) is needed ? (a) \(56 \mathrm{ml}\) (b) \(224 \mathrm{ml}\) (c) \(28 \mathrm{ml}\) (d) \(112 \mathrm{ml}\)

Van Arkel method of purification of metals involves converting the metal into a (a) Volatile stable compound (b) Volatile unstable compound (c) Non volatile stable compound (d) None of these