Chapter 17

Which of the following is an ore of sodium? (a) chile saltpeter (b) carnalite (c) sylvine (d) none of these

Which of the following is not efflorescent? (a) \(\mathrm{CuSO}_{4}\) (b) \(\mathrm{NaOH}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{MgSO}_{4}\)

Highly pure dilute solution of sodium in liquid ammonia (a) exhibits electrical neutrality (b) produces sodium amide (c) produces hydrogen gas (d) show blue colour

When carbon monoxide is passed over solid caustic soda and heated to \(200^{\circ} \mathrm{C}\), it forms (a) \(\mathrm{HCOONa}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{COONa}\) (d) \(\mathrm{NaHCO}_{3}\)

Which of the following is formed when sodium sulphate is boiled with powered sulphur? (a) \(\mathrm{NaHSO}_{4}\) (b) \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\)

Perchloric acid is prepared by the action of concentrated sulphuric acid on (a) potassium perchlorate (b) barium chlorate (c) barium chloride (d) sodium chloride

What happens, when a fire caused by potassium in the laboratory is extinguished by pouring water? (a) there is a decrease in fire intensity (b) there is an increase in fire intensity (c) the fire completely extinguished (d) none of these

The oxidation state of sodium in sodium amalgam is (a) \(-1\) (b) \(+1\) (c) \(+2\) (d) 0

In a reaction, sodium is heated with \(\mathrm{BeCl}_{2} .\) In this reaction, sodium acts as (a) precipitating agent (b) hydrolysis agent (c) reducing agent (d) oxidizing agent

Which of the following does not precipitate in the Solvay process, for the manufacture of \(\mathrm{Na}_{2} \mathrm{CO}_{3} ?\) (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{NaCl}\) solution

Excess of \(\mathrm{Na}^{+}\)ions in human system causes (a) anaemia (b) high blood pressure (c) diabetes (d) low blood pressure

When \(\mathrm{K}_{2} \mathrm{O}\) is added to water, the solution is basic because it contains a significant concentration of (a) \(\mathrm{OH}^{-}\) (b) \(\mathrm{K}^{+}\) (c) \(\mathrm{O}^{3-}\) (d) \(\mathrm{O}_{2}^{2-}\)

Crystalline sodium chloride is a bad conductor of electricity because (a) it contains free molecules (b) the ions present in it are not free to move (c) it does not possess ions (d) it contains only molecules

When sodium is treated with sufficient oxygen/air, the product obtained is (a) \(\mathrm{NaO}_{2}\) (b) \(\mathrm{NaO}\) (c) \(\mathrm{Na}_{2} \mathrm{O}\) (d) \(\mathrm{Na}_{2} \mathrm{O}_{2}\)

In the extraction of sodium by Down's process, cathode and anode are respectively (a) nickel and chromium (b) iron and graphite (c) copper and nickel (d) copper and chromium

Sodium is heated in air at \(300^{\circ} \mathrm{C}\) to form X.X absorbs \(\mathrm{CO}_{2}\) and forms \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{Y}\). Which of the following is Y? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{H}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\)

The product obtained on fusion of \(\mathrm{BaSO}_{4}\) and \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) is (a) \(\mathrm{BaO}\) (b) \(\mathrm{BaCO}_{3}\) (c) \(\mathrm{BaHS}_{4}\) (d) \(\mathrm{Ba}(\mathrm{OH})_{2}\)

A mixture of sodium oxide and calcium oxide are dissolved in water and saturated with excess carbon dioxide gas. The resulting solution is ......It contains . (a) acidic \(\mathrm{NaOH}\) and \(\mathrm{CaCO}_{3}\) (b) basic \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{CaCO}_{3}\) (c) neutral \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{CaCO}_{3}\) (d) basic \(\mathrm{NaOH}\) and \(\mathrm{Ca}(\mathrm{OH})\).

Which one of the following electrolysis is used in Down's process of extracting sodium metal? (a) \(\mathrm{NaCl}\) (b) \(\mathrm{NaCl}+\mathrm{NaOH}\) (c) \(\mathrm{NaOH}+\mathrm{KCl}+\mathrm{KF}\) (d) \(\mathrm{NaCl}+\mathrm{KCl}+\mathrm{KF}\)

An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of (a) weak acid and weak base (b) weak acid and strong base (c) strong acid and strong base (d) strong acid and weak base

In Solvay process of manufacture of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\), the by products are (a) \(\mathrm{CaCl}_{2}, \mathrm{CO}_{2}, \mathrm{NH}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{CO}_{2}\) (c) \(\mathrm{NH}_{4} \mathrm{Cl}, \mathrm{CaO}^{2}\) (d) \(\mathrm{CaO}, \mathrm{Na}_{2} \mathrm{CO}_{3}\)

On heating sodium metal in a current of dry ammonia, the compound formed is (a) sodium hydride (b) sodium amide (c) sodium azide (d) sodium nitride

In \(\mathrm{NaCl}\), the chloride ions occupy the space in a fashion of (a) \(\mathrm{BCC}\) (b) \(\mathrm{FCC}\) (c) both (d) none

When a solution of sodium hydroxide is added in excess to the solution of potash alum, we get (a) a clear solution (b) a crystalline mass (c) a white precipitate (d) bluish white precipitate

The pair of compounds which cannot exist together is (a) \(\mathrm{NaHCO}_{3}\) and \(\mathrm{NaOH}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{NaHCO}_{3}\) (c) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) and \(\mathrm{NaOH}\) (d) \(\mathrm{NaHCO}_{3}\) and \(\mathrm{NaCl}\)

Sodium metal reacts with \(\mathrm{Al}_{2} \mathrm{O}_{3}\) at high temperature to give a sodium compound X.X reacts with carbon dioxide in water to form Y.Y is ...... (a) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{O}_{2}\) (c) \(\mathrm{NaAlO}_{2}\) (d) \(\mathrm{Na}_{2} \mathrm{O}\)

Aqueous solution of \(\mathrm{NaCl}\) is electrolyzed using platinum electrodes. What is the product formed at the cathode? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{H}_{2}\) (d) \(\mathrm{Na}\)

Oxalic acid reacts with concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to give a mixture of two gases. When this mixture is passed through caustic potash, one of the gases is absorbed. What is the product formed by the absorbed gas with caustic potash? (a) \(\mathrm{KHCO}_{3}\) (b) \(\mathrm{K}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{KOH}\) (d) \(\mathrm{K}_{2} \mathrm{SO}_{4}\)

In organic reactions, sodium in liquid ammonia is used as ...... (a) oxidizing agent (b) reducing agent (c) hydrolyzing agent (d) precipitating agent

Which one of the following compounds in aqueous solution gives a white precipitate with perchloric acid? (a) \(\mathrm{NaCl}\) (b) \(\mathrm{MgCl}_{2}\) (c) \(\mathrm{KCl}\) (d) \(\mathrm{FeCl}_{3}\)

Which of the following ore contains both calcium and magnesium? (a) lime stone (b) dolomite (c) epsom salt (d) carnalite

Which of the following is the composition of carnalite? (a) \(\mathrm{MgCl}_{2} \cdot \mathrm{KCl} .6 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Fe}_{3} \mathrm{O}_{4}\) (c) \(\mathrm{Na}_{3} \mathrm{AlF}_{6}\) (d) \(\mathrm{Na}_{2} \mathrm{Al}_{2} \mathrm{O}_{3}\)

Which of the following is produced when magnesium reacts with hot concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4} ?\) (a) \(\mathrm{H}_{2}\) (b) \(\mathrm{S}\) (c) \(\mathrm{MgO}\) (d) \(\mathrm{SO}_{2}\)

Aqueous solution of carnalite gives a positive test for (a) potassium, magnesium and chloride ions (b) potassium ions only (c) potassium and chloride ions only (d) chloride ions only

Which of the following is calcium superphosphate? (a) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \mathrm{H}_{2} \mathrm{O}+\mathrm{CaSO}_{4}\) (b) \(\mathrm{CaSO}_{4}+\mathrm{CaO}\) (c) \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}+2 \mathrm{CaSO}_{4}\) (d) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \mathrm{H}_{2} \mathrm{O}+2\left(\mathrm{CaSO}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}\right)\)

What is the molecular formula of plaster of paris? (a) \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\) (c) \(2 \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)

Mortar is a mixture of (a) slaked lime \(+\) silica \(+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{CaCO}_{3}+\) silica \(+\mathrm{H}_{2} \mathrm{O}\) (c) slaked lime \(+\) plaster of paris \(+\mathrm{H}_{2} \mathrm{O}\) (d) plaster of paris + silica

Which of the following is an alloy of aluminium? (a) magnallium (b) duralumin (c) brass (d) both (a) and (b)

What is the molecular formula of gypsum? (a) \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\) (d) \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)

In the Castner's process of extraction of sodium cathode is (a) nickel rod (b) iron rod (c) graphite rod (d) copper rod

Which of the following is incorrect? (a) Mg burns in air releasing dazzling light rich in uv rays (b) \(\mathrm{CaCl}_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) when mixed with ice gives a freezing mixture (c) Mg cannot form complexes (d) Be can form complexes due to its very small size

An important ore of magnesium is (a) malachite (b) cassiterite (c) carnalite (d) galena

Plaster of paris is used (a) in dentistry and surgery (b) as a plaster for walls (c) as a drying agent (d) in metallurgical process

The reaction of slaked lime with \(\mathrm{Cl}_{2}\) gas gives (a) a mixture of \(\mathrm{Ca}(\mathrm{OCl})_{2}, \mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{CaCl}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) (b) quick lime (c) Baryta water (d) only \(\mathrm{Ca}(\mathrm{OCl})_{2}\)

The compound insoluble in acetic acid is (a) calcium oxide (b) calcium carbonate (c) calcium oxalate (d) calcium hydroxide

The hydration energy or \(\mathrm{Mg}^{2+}\) ions is higher than that of (a) \(\mathrm{Al}^{3+}\) (b) \(\mathrm{Be}^{2+}\) (c) \(\mathrm{Na}^{+}\) (d) none of these

On heating quick lime with coke in an electric furnace, we get (a) \(\mathrm{CaC}_{2}\) (b) \(\mathrm{CaCO}_{3}\) (c) \(\mathrm{CaO}\) (d) \(\mathrm{Ca}\) and \(\mathrm{CO}_{2}\)

Limestone is not used in which of the following manufacturing processes? (a) Portland cement (b) phosphorus from phosphorite (c) iron form haematite (d) Solvay process of sodium carbonate

Solution of \(\mathrm{MgCl}_{2}\) in water has \(\mathrm{pH}\) value (a) 7 (b) \(>7\) (c) \(\leq 7\) (d) \(14.2\)

A solution of \(\mathrm{Ca}\) in liquid ammonia when evaporated to dryness gives as residue of (a) \(\left[\mathrm{Ca}\left(\mathrm{NH}_{3}\right) \mathrm{x}\right]^{2+}\) (b) \(\mathrm{Ca}\left(\mathrm{NH}_{3}\right)_{6}\) (c) pure Ca (d) \(\left[\mathrm{Ca}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)