Chemistry

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Showing 1376 to 1398 of 1398 questions (page 56 of 56).

1376. On an energy profile diagram, the difference between the energy of the reactants and the peak represents the

A. activation energy of the reverse reaction B. activation energy of the forward reaction C. enthalpy change D. entropy change E. bond energy

1377. A chain reaction consists of the stages

A. hydrolysis and condensation B. initiation, propagation and termination C. dissolution and precipitation D. absorption and emission E. oxidation and reduction

1378. Elements showing properties intermediate between metals and non-metals are called

A. alkali metals B. halogens C. lanthanides D. metalloids E. noble gases

1379. Sodium bicarbonate is commonly known as

A. lime B. baking soda C. soda ash D. caustic soda E. washing soda

1380. Sodium reacts with hydrogen on heating to give

A. no product B. sodium peroxide C. sodium oxide D. sodium hydroxide E. sodium hydride

1381. Washing soda is

A. sodium bicarbonate B. sodium sulphate C. hydrated sodium carbonate D. calcium carbonate E. sodium hydroxide

1382. Carbon dioxide is a gas while silicon dioxide is a high melting solid because carbon dioxide consists of

A. discrete molecules held by weak forces B. metallic bonds C. ions D. a giant covalent network E. hydrogen bonded chains

1383. Ammonia acts as a Lewis base because it

A. accepts a proton only B. is basic only in water C. donates its lone pair of electrons D. is a gas E. releases hydroxide ions in all solvents

1384. Tincture of iodine, used as an antiseptic, is a solution of iodine in

A. potassium iodide solution only B. water C. ether D. alcohol E. glycerol

1385. The silver mirror test uses ammoniacal silver nitrate, which is known as

A. Baeyer's reagent B. Benedict's solution C. Fehling's solution D. Lucas reagent E. Tollen's reagent

1386. A complex ion with a coordination number of four is commonly

A. tetrahedral or square planar B. pyramidal C. linear only D. trigonal planar only E. octahedral or linear

1387. Finely divided nickel is used industrially as a catalyst for

A. the cracking of petroleum B. the oxidation of sulphur dioxide C. the manufacture of nitric acid D. the hydrogenation of unsaturated compounds E. the Solvay process

1388. The boiling points of the straight chain alkanes

A. are all the same B. increase with increasing chain length C. are independent of molar mass D. are highest for methane E. decrease with increasing chain length

1389. Bromine water is decolourized by

A. hexene B. propanone C. benzene D. hexane E. ethanol

1390. An alcohol in which the hydroxyl group is attached to a carbon bearing two alkyl groups is

A. tertiary B. a phenol C. aromatic D. secondary E. primary

1391. A 2,4-dinitrophenylhydrazine test gives an orange precipitate with

A. ethers B. carboxylic acids C. alkanes D. aldehydes and ketones E. alcohols

1392. Polystyrene is used for making disposable cups because it is

A. biodegradable B. a good conductor of heat C. a thermosetting resin D. a light rigid thermoplastic and a poor conductor of heat E. water soluble

1393. Liquefied petroleum gas consists mainly of

A. hydrogen B. carbon monoxide C. propane and butane D. octane E. methane

1394. A complete fertilizer described as NPK supplies

A. nitrogen, phosphorus and calcium B. nickel, phosphorus and potassium C. nitrogen, potassium and carbon D. nitrogen only E. nitrogen, phosphorus and potassium

1395. Ordinary Portland cement sets and hardens by

A. oxidation in air B. hydration of its silicate and aluminate phases C. evaporation of water only D. fermentation E. melting

1396. Soda lime glass is made by fusing sand with

A. sodium carbonate and limestone B. lead oxide only C. potassium nitrate and sulphur D. boric acid only E. sodium chloride and water

1397. DDT is now restricted mainly because it

A. decomposes too rapidly B. is too expensive C. persists in the environment and accumulates in food chains D. is ineffective against insects E. dissolves readily in water

1398. Chlorination of municipal water supplies is carried out primarily to

A. remove dissolved iron B. kill pathogenic micro-organisms C. lower the pH D. remove hardness E. improve the taste

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