Chemistry 12th Test -5

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1,Which has no rotation of symmetry?

4 points

(a) Hexagonal

(b) Orthorhombic

(d) Triclinic

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2, Which of the following metal oxides is antiferromagnetic in nature?

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(a) MnO2

(b) TiO2

(d) CrO2

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3, The liquified metal expanding on solidification is

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(a) Ga

(b) Al

(d) Cu

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4, The number of unit cells in 58.5 g of NaCl is nearly *

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(a) 6 × 1020

(b) 3 × 1022

(d) 0.5 × 1024

5, In case of electrolyte which dissociates in solution the Van’t Hoff’s factor, i is

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(a) > 1

(b) < 1

(d) = 0

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6,Which of the following salt will have same value of Vant Hoff’s factor (i) as that of K4[Fe (CN)6]

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(a) Al2(SO4)3

(b) NaCl

(d) Na2SO4

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7, For a cell reaction involving two electron change the standard emf of the cell is found to be 0.295 V at 25°C. The equilibrium constant for the reaction at 25°C will be: *

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(a) 2.95 × 10²

(b) 10

(d) 1 × 10-10

8, The highest electrical conductivity of the following aqueous solutions is of? *

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(a) 0.1 M acetic acid

(b) 0.1 M chloro acetic acid

(d) 0.1 M difluoro acetic acid

9, An aqueous solution containing one mole per litre of each of Cu(NO3)2, AgNO3, Hg (NO3)2 and Mg (NO3)2 is being electrolysed using inert electrodes. The values of standard electrode (reduction) potentials in volts are Ag/Ag+ = + 0.80, Hg/ Hg2+ = 0.79, Cu/Cu2+ = 0.34, Mg/Mg2+ = -2.37.With increasing voltage, the sequence of deposition of metals on cathode will be

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(a) Ag, Hg, Cu, Mg

(b) Mg, Cu, Hg, Ag

(d) Cu, Hg, Ag

(e) Cu, Hg, Ag, Mg.

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10, For a certain reaction aA → bB, the rate of reaction is doubled when the concentration of A is increased by four times. The rate ot reaction is equal to

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(a) k[A]a

(b) k[A]1/2

(d) k[A].

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11, The rate law for the chemical reaction, 2NO2Cl → 2NO2 + Cl2 is r = k[NO2Cl]. Which of the following is rate controlling step?

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(a) NO2 + Cl → NO2Cl

(b) NO2Cl + Cl → NO2 + Cl2

(d) 2NO2Cl → 2NO2 + Cl2.

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12, Rate constant of a reaction depends upon

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(a) Temperature

(b) time

(d) none

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13, The reaction 2 SO2 (g) + O2 (g) ⇌ SO3 (g) is carried out in 1 dm³ vessel and 2 dm³ vessel separately. The ratio of the reaction velocities will be

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(a) 1 : 8

(b) 1 : 4

(d) 8 : 1

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14, Fog is colloidal system of

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(a) gas in liquid

(b) liquid in gas

(d) gas in solid.

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15, Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?

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(a) NaCl

(b) MgSO4

(d) K4[Fe(CN)6]

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16, Milk is an emulsion of fat, etc., dispersed in

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(a) water

(b) amino acid

(d) saline water.

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17, Heating pyrites to remove sulphur is called

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(a) Smelting

(b) Calcination

(d) roasting

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18, In the metallurgy of which of the follo wing, cupellation process is used?

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(a) Copper

(b) Silver

(d) Aluminium

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19, Water is oxidized to oxygen by

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(a) ClO2

(b) kMnO4

(d) Fluorine

(e) Ozone.

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20, Which of the following are isoelectronic and isostructural?NO3–, CO32-, ClO3–, SO3

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(a) NO3–, CO32-

(b) SO3, NO3–

(d) CO32-, SO3

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21, On boiling phosphorus with KOH solution, product formed is

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(a) Potassium sulphate

(b) Phosphorus pentoxide

(d) Phosphine.

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22, Which statement is wrong for NO?

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(a) It is anhydride of nitrous acid.

(b) Its dipole moment is 0.22 D.

(d) It is paramagnetic.

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23, During debromination of meso-dibromo butane, the major compound formed is *

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(a) n-butane

(b) 1-butene

(d) trans-2-butene.

24, The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methyl butane is *

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(a) 2

(b) 3

(d) 1

25, Arrange the following compounds in order of increasing dipole moment: Toluene (I), m-dichlorobenzene (II), o- dichlorobenzene (III) and p-dichlorobenzene (IV). *

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(a) I < IV < II < III

(b) IV < r < II < III

(d) IV < II < I < III

26, In the following groups : – O Ac (I), – O Me (II), – O SO2 Me (III), – OSO2 CF3 (IV), The order of leaving group ability is *

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(a) I > II > III > IV

(b) IV > III > I > II

(d) II > III > IV > I

27, Identify the set of reagent/reaction conditions X and Y in the following set of transformations: *

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(a) X = dil. aqueous NaOH, 20° C, Y = HBr/Acetic acid, 20°C

(b) X = Cone, alcoholic NaOH, 80°C, Y = HBr/acetic acid, 20°C

(d) X = Cone, alcoholic NaOH, 80°C, Y = Br2/CHCl3, 0°C.

28, In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markovnikov’s addition to alkenes because *

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(a) both are highly ionic

(b) one is oxidizing and the other is reducing

(d) all the steps are exothermic in both the reactions

29, When chlorine is passed through propene at 400°C, which of the following is formed? *

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(a) FVC

(b) Allyl Chloride

(d) 1,2-Dichloroethane

30, Ethers are *

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(a) Neutral

(b) Basic

(d) Amphoteric

31, Among the following, the one which reacts most readily with ethanol is

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(a) p-Nitrobenzyl bromide

(b) p-Chlorobenzyl bromide

(d) p-methyl benzyl bromide.

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32, tert-Butyl methyl ether on heating with HI gives a mixture of *

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(a) tert-Butyl alcohol and methyl iodide.

(b) tert-Butyl iodide and methanol

(d) Isobutylene and methanol.

33, Cyclohexene is best prepared from cyclohexanol by which of the following: *

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(a) cone. H3PO4

(b) Cone. HCl/ZnCl2

(d) Cone. HBr

34, Wood spirit is known as acetone *

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(a) methanol

(b) ethanol

(d) benzene

35, Acetone reacts with Grignard reagent to form *

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(a) 3° alcohol

(b) 2° alcohol

(d) no reaction

36, Which of the following cannot reduce Fehling’s solution? *

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(a) Formic acid

(b) Acetic acid

(d) Acetaldehyde

37, Which of the following acids does not form anhydride? *

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(a) Formic add

(b) Acetic acid

(d) n-butyric acid

38, The acid which does not contain-COOH group is *

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(a) Ethanoic acid

(b) Lactic acid

(d) Palmitic acid

39, Trans-esterification is a reaction between *

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(a) two ester molecules

(b) alcohol and carboxylic acid

(d) alcohol and ester.

40, Which of the following does not react with Hinsberg reagent? *

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(a) Ethylamine

(b) (CH3)2NH

(d) Propan-2-amine

41, Oxidation of aniline with K2Cr2O7/H2SO4 gives *

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(a) phenylhydroxylamine

(b) p-benzoquinone

(d) nitrobenzene

42, Which of the following amines can exhibit enantiomerism?

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(a) Benzeamine

(b) 2-Butanamine

(d) 2-Methyl-propanamine.

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43, The number of tripeptide formed by 3 different amino acids. *

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(a) Three

(b) Four

(d) Six.

44, The functional group which is found in amino acids is *

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(a) COOH

(b) -NH2

(d) both (a) and (b).

45, The vitamins absorbed from intestine along with fats are

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(a) A and D

(b) A, B

(d) D, B

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