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Showing 2876 to 2900 of 3046 questions (page 116 of 122).

2876. Diluting 10 cm3 of a 2 mol dm-3 solution to a total volume of 100 cm3 gives a concentration of

A. 0.02 mol dm-3 B. 2 mol dm-3 C. 0.2 mol dm-3 D. 20 mol dm-3 E. 0.5 mol dm-3

2877. The mole fraction of the solute in a solution of 1 mol of solute in 9 mol of solvent is

A. 0.09 B. 1.0 C. 0.11 D. 0.9 E. 0.1

2878. A concentration expressed as percentage weight by volume means grams of solute per

A. 100 g of solution B. 100 cm3 of solution C. 1 dm3 of solvent D. 1 kg of solvent E. mole of solvent

2879. The products of the electrolysis of molten sodium chloride are

A. chlorine and oxygen B. oxygen and sodium C. hydrogen and chlorine D. sodium and chlorine E. sodium hydroxide and hydrogen

2880. The oxidation number of chromium in the chromate ion is

A. +4 B. +2 C. +7 D. +3 E. +6

2881. In the ion electron method of balancing redox equations, the two half reactions are balanced for

A. temperature B. mass only C. charge only D. both mass and charge E. volume

2882. A metal will displace hydrogen from dilute acid if its standard reduction potential is

A. negative B. greater than that of copper C. zero D. equal to that of silver E. positive

2883. A reaction in which one of the products acts as a catalyst is described as

A. inhibited B. heterogeneous C. autocatalytic D. photochemical E. zero order

2884. The rate of a reaction may be followed physically by measuring changes in

A. the molar mass of the reactants B. the atomic number C. the periodic group D. the balanced equation E. colour or electrical conductivity

2885. An enzyme requiring a non-protein component in order to function needs a

A. substrate B. buffer C. product D. denaturant E. cofactor

2886. A cation is always smaller than its parent atom because

A. it gains electrons B. it becomes a noble gas C. it forms a covalent bond D. loss of electrons reduces electron electron repulsion and increases effective nuclear charge per electron E. its nucleus shrinks

2887. Hydrogen is difficult to place in the periodic table because it resembles

A. the transition metals B. both the alkali metals and the halogens in different respects C. only the halogens D. the noble gases E. only the alkali metals

2888. The elements of the f block are collectively known as

A. representative elements B. transition elements C. inner transition elements D. noble gases E. metalloids

2889. The vigour of reaction of the alkali metals with water

A. is the same for all B. is greatest for lithium C. increases down the group D. depends only on the temperature E. decreases down the group

2890. The solubility of the hydroxides of the group two metals

A. is zero for all B. increases down the group C. decreases down the group D. is greatest for beryllium E. is the same throughout

2891. The basic character of the oxides of the alkaline earth metals

A. decreases down the group B. is highest for beryllium C. is absent altogether D. remains the same E. increases down the group

2892. Aluminium is extracted industrially by the electrolysis of alumina dissolved in

A. concentrated sulphuric acid B. water C. liquid ammonia D. molten cryolite E. molten sodium chloride

2893. Nitric acid is manufactured industrially by the

A. Solvay process B. Ostwald process C. Haber process D. contact process E. Hall Heroult process

2894. Chlorine displaces bromine from a solution of potassium bromide because chlorine is

A. a reducing agent B. less reactive C. less electronegative D. larger in size E. a stronger oxidizing agent

2895. Sulphuric acid is described as a dehydrating agent because it

A. evaporates readily B. oxidizes metals C. removes the elements of water from compounds D. reduces sulphates E. adds water to compounds

2896. Ferric ion differs from ferrous ion in that ferric is

A. Fe+ only B. Fe4+ C. Fe3+ and more oxidized D. Fe2+ and less oxidized E. uncharged

2897. Potassium dichromate is widely used in the laboratory as

A. a catalyst only B. an oxidizing agent in acidic medium C. a dehydrating agent D. a reducing agent E. a base

2898. Chromium is used for electroplating steel articles chiefly because it

A. resists corrosion and gives a bright hard finish B. melts at low temperature C. conducts heat well D. is magnetic E. is cheap

2899. The IUPAC name of the compound with formula CH3CH(CH3)CH2CH3 is

A. 2-methylpropane B. n-pentane C. 3-methylbutane D. 2-methylbutane E. isopentene

2900. The number of structural isomers of pentane, C5H12, is

A. 5 B. 2 C. 4 D. 3 E. 6

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