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Showing 3026 to 3046 of 3046 questions (page 122 of 122).

3026. Elements showing properties intermediate between metals and non-metals are called

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

3027. Sodium bicarbonate is commonly known as

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

3028. Sodium reacts with hydrogen on heating to give

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

3029. Washing soda is

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

3030. 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

3031. 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

3032. 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

3033. 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

3034. 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

3035. 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

3036. 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

3037. Bromine water is decolourized by

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

3038. 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

3039. A 2,4-dinitrophenylhydrazine test gives an orange precipitate with

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

3040. 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

3041. Liquefied petroleum gas consists mainly of

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

3042. 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

3043. 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

3044. 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

3045. 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

3046. 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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