Chapter 12

Temporary hardness of water is due to the presence of (a) \(\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}\) and \(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\) (b) \(\mathrm{MgCl}_{2}\) and \(\mathrm{MgSO}_{4}\) (c) \(\mathrm{CaCl}_{2}\) and \(\mathrm{CaSO}_{4}\) (d) \(\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}\) and \(\mathrm{MgCl}_{2}\)

Which of the following is incorrect regarding solution of sodium bicarbonate in watert (a) Weakly acidic (b) Yellow colour with methyl orange (c) No colour with phenolphihalein (d) Two of the above

Barium chloride is treated with potassium chromate. A ppt. is observod. What is the colour 7 (a) yellow (b) green (c) white (d) flesh

A metal \(\mathrm{X}\) on heating in nitrogen gas gives Y. \(\mathrm{Y}\) on treatment with \(\mathrm{H}_{2} \mathrm{O}\) gives a colourless gas which on passing through \(\mathrm{CuSO}_{4}\) solution tums it deep blue. \(\mathrm{Y}\) is (a) \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\) (b) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) (c) \(\mathrm{NH}_{1}\) (d) \(\mathrm{MgO}\)

Bleaching powder is prepared by passing chlorine into (a) \(\mathrm{Ca}(\mathrm{OCl})_{2}\) (b) \(\mathrm{Ca}(\mathrm{OH})_{2}\) (c) \(\overline{\mathrm{CaH}}\). (d) \(\mathrm{Ca}(\mathrm{ClO}\)

On heating sodium carbonate is evolved. (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{CO}\) (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) No gas

A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and on cooling water was added, the gas evolved was (a) ammonia (b) hydrogen (c) nitrogen (d) oxygen

Which of the following is arranged in order of decreasing solubility in water? (a) \(\mathrm{BaSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{BeSO}_{4}\) (b) \(\mathrm{BeSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{BaSO}_{4}\) (c) \(\mathrm{BeSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{CaSO}_{4}>\mathrm{SrSO}_{4}>\mathrm{BaSO}_{4}\) (d) \(\mathrm{CaSO}_{4}>\mathrm{BaSO}_{4}>\mathrm{BeSO}_{4}>\mathrm{MgSO}_{4}>\mathrm{SrSO}_{4}\)

Which of the following on thermal decomposition yields a basic as well as an acidic oxide? (a) \(\mathrm{KClO}_{3}\) (b) \(\mathrm{CaCO}_{3}\) (c) \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) (d) \(\mathrm{NaNO}_{3}\)

Which of the following compounds on reacting with \(\mathrm{NaOH}\) and \(\mathrm{H}_{2} \mathrm{O}_{2}\) gives a yellow colour? (a) \(\mathrm{Cr}(\mathrm{OH})_{3}\) (b) \(\mathrm{Zn}(\mathrm{OH})_{2}\) (c) \(\mathrm{Al}(\mathrm{OH})_{3}\) (d) \(\mathrm{Fe}(\mathrm{OH})_{3}\)

\(\mathrm{Rb}\left(\mathrm{ICl}_{2}\right)\) on heating gives (a) \(\mathrm{RbCl}+\mathrm{ICl}\) (b) \(\mathrm{R} \mathrm{\textrm{t }} \mathrm{Cl}+\mathrm{I}_{2}\) (c) \(2 \mathrm{Rb}+\mathrm{I}_{2}+2 \mathrm{Cl}_{2}\) (d) \(2 \mathrm{Rb}+2 \mathrm{ICl}+\mathrm{Cl}\),

Which of the following salts on heating gives a mixture of two gases? (a) \(\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}\) (b) \(\mathrm{NaNO}_{3}\) (c) \(\mathrm{KNO}_{3}\) (d) \(\mathrm{RbNO}_{3}\)

\(\mathrm{NaNO}_{3}\) on being heated to \(500^{\circ} \mathrm{C}\) gives (a) \(\mathrm{NaNO}_{2}\) only (b) \(\mathrm{Na}_{2} \mathrm{O}+\mathrm{N}_{2}\) (c) \(\mathrm{NaNO}_{2}+\mathrm{O}_{2}\) (d) \(\mathrm{NaNO}_{2}+\mathrm{O}_{2}+\mathrm{N}_{2}\)

Which of the following compounds is not a peroxide? (a) \(\mathrm{BaO}_{2}\) (b) \(\mathrm{KO}_{2}\) (c) \(\mathrm{Na}_{2} \mathrm{O}_{2}\) (d) \(\mathrm{CrO}_{5}\)

Which of the following compounds is a peroxide ? (a) \(\mathrm{MnO}_{2}\) (b) \(\mathrm{SnO}_{2}\) (c) \(\mathrm{BaO}_{2}\) (d) \(\mathrm{SiO}_{2}\)

On shaking \(\mathrm{H}_{2} \mathrm{O}_{2}\) with acidified potassium dichromate and ether, ethereal layer becomes (a) green (b) red (c) blue (d) brown

Lithopone is a mixture of (a) barium sulphate and rinc sulphide (b) barium sulphide and zinc sulphide (c) calcium sulphate and zine sulphide (d) calcium sulphide and rine sulphide

The colour of iodine solution is discharged by shaking it with aqueous solution of (a) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) sodium sulphide (c) sodium sulphate (d) sodium thiosulphate

The hydroxide of which metal ion is soluble in excess of sodium hydroxide soluuou (a) \(\mathrm{Fe}^{t+t}\) (b) \(\mathrm{Cr}^{4+t}\) (c) \(\mathrm{Al}^{*+}\) (d) \(\mathrm{Cu}^{* *+}\)

The reaction of sodium thiosulphate with \(\mathbf{I}_{2}\) gives (a) sodium sulphide (b) sodium sulphite (c) sodium sulphate (d) sodium tetrathionate

Which of the following metal carbonates is decomposed on heating? (a) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (b) \(\mathrm{MgCO}_{3}\) (c) \(\mathrm{K}_{2} \mathrm{CO}_{3}\) (d) \(\mathrm{Rb}_{2} \mathrm{CO}_{3}\)

Zinc reacts with excess of caustic soda to form (a) \(\mathrm{Zn}(\mathrm{OH})_{2}\) (b) \(\mathrm{ZnO}\) (c) \(\mathrm{Na}_{2} \mathrm{ZnO}_{2}\) (d) \(\mathrm{Zn}(\mathrm{OH})_{2} \cdot \mathrm{ZnCO}_{3}\)

Nitrogen dioxide cannot be obtained by heating (a) \(\mathrm{KNO}_{3}\) (b) \(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\) (c) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\) (d) \(\mathrm{AgNO}_{3}\)

A deliquescent white crystalline hydroxide \(\mathrm{X} \mathrm{Tr}\) hydroxide which decomposes to give a insoluble brown layer of its oxide. \(\mathrm{X}\) is powerful cautery and breaks down the proteins of skin flesh to a pasty mass, \(\mathrm{X}\) and \(\mathrm{Y}\) are (a) \(\mathrm{NaOH}, \mathrm{AgNO}_{3}\) (b) \(\mathrm{NaOH}, \mathrm{Zn}\left(\mathrm{NO}_{2}\right)_{2}\) (c) \(\mathrm{NaOH}, \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3}\) (d) \(\mathrm{Ca}(\mathrm{OH})_{2} \cdot \mathrm{HgNO}_{3}\)

To a clear solution of compound \((\mathrm{X})\), a solution of \(\mathrm{BaCl}_{2}\) is precipitate is formed which does not dissolve in dil. HCl. The compound \((X)\) is a (a) nitrate (b) bromide (c) sulphate (d) carbonate

Which of the following is diamagnetic? (a) \(\mathrm{Na}_{2} \mathrm{O}_{2}\) (b) \(\mathrm{KO}_{2}\) (c) both (d) none

Which of the following does not produce hydrogen with NaC (a) \(\mathrm{Si}\) (b) \(\mathrm{S}\) (c) \(\mathrm{B}\) (d) \(\mathrm{Zn}\)

Which of the following does not evolve hydrogen gas from \(\mathrm{NaOH}\) ? (a) \(\mathrm{P}\) (b) \(\mathrm{B}\) (c) \(\mathrm{Zn}\) (d) \(\underline{\text { Si }}\)

Which of the following gives methane with water? (a) \(\mathrm{BeC}_{2}\) (b) \(\mathrm{CaC}_{2}\) (c) \(\mathrm{Ag}_{2} \mathrm{C}_{3}\) (d) none of these

What is formed by reacting dry KOH with ozone? (a) \(\mathrm{K}_{2} \mathrm{O}\) (b) \(\mathrm{KO}_{2}\) (c) \(\mathrm{K}_{2} \mathrm{O}_{3}\) (d) none of these

What is formed when iodine is absorbed by hypo solution ? (a) \(\mathrm{Nal}_{3}\) (b) \(\mathrm{Na}_{4} \mathrm{~S}_{4} \mathrm{O}_{6}\) (c) \(\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\) (d) \(\mathrm{Na}_{3} \mathrm{~S}_{4} \mathrm{O}_{6}\)

What is the correct order of density? (a) \(\mathrm{Li}>\mathrm{Na}>\mathrm{K}\) (b) \(\mathrm{Li}<\mathrm{Na}<\mathrm{K}\) (c) \(\mathrm{Li}<\mathrm{Na}>\mathrm{K}\) (d) \(\mathrm{Li}>\mathrm{Na}<\mathrm{K}\)