EdgineerX

1301. An aqueous solution of ammonium chloride is

A. a buffer of pH 7 B. acidic C. amphoteric D. neutral E. basic

1302. For the reaction in which one mole of gas gives two moles of gas, an increase in volume at constant temperature

A. shifts the equilibrium to the right B. has no effect C. shifts the equilibrium to the left D. stops the reaction E. decreases Kc

1303. In an acid base titration, the point at which the amounts of acid and base are chemically equivalent is the

A. buffer region B. end point of the indicator only C. isoelectric point D. equivalence point E. neutral point of water

1304. 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

1305. 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

1306. 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

1307. 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

1308. The oxidation number of chromium in the chromate ion is

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

1309. 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

1310. 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

1311. 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

1312. 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

1313. An enzyme requiring a non-protein component in order to function needs a

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

1314. 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

1315. 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

1316. 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

1317. 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

1318. 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

1319. 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

1320. 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

1321. Nitric acid is manufactured industrially by the

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

1322. 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

1323. 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

1324. 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

1325. 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

Chemistry