RK vision Academy 11th Test-1 (chemistry)

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1, An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be *

4 points

(a) CHO

(b) CH4O

(d) CH2O

2, What is the normality of a 1 M solution of H3PO4 *

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(a) 0.5 N

(b) 1.0 N

(d) 3.0 N

3, The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is *

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(a) 40.3

(b) 36.3

(d) 11.3

4, The increasing order (lowest first) for the values of e/m (charge/mass) for *

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(a) e, p, n, α

(b) n, p, e, α

(d) n, α, p, e

5, given principal level n = 4, the energy of its subshells is in the order *

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(a) s < p < d < f

(b) s > p > d > f

(d) f < p < d < s

6, A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10-34 Js) *

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(a) 6.63 × 10-37 m

(b) 6.63 × 10-31 m

(d) 6.63 × 10-35 m

7, Which of the following sets of quantum numbers represents the highest energy of an atom? *

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(a) n = 3, l = 0, m = 0, s = + 12

(b) n = 3, l = 1, m = 1, s = + 12

(d) n = 4, l = 0, m = 0, s = + 12

8, The correct order of first ionization potential among following elements, Be, B, C, N and O is

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(a) B < Be < C < O < N

(b) B < Be < C < N < O

(d) Be < B < C < O < N

Clear selection

9, Increasing order of electro negativity is

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(a) Bi < P < S < Cl

(b) P < Bi < S < Cl

(d) Cl < S < Bi < P

Clear selection

10, In the long form of the periodic table, the valence shell electronic configuration of 5s²5p4 corresponds to the element present in: *

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(a) Group 16 and period 6

(b) Group 17 and period 6

(d) Group 17 and period 5

11, The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing order of the polarizing power of the cationic species, K+, Ca++, Mg2+, Be2+? *

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(a) Ca2+ < Mg2+ < Be+ < K+

(b) Mg2+ < Be2+ < K+ < Ca2+

(d) K+ < Ca2+ < Mg2+ < Be2+

12, The species having pyramidal shape is *

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(a) SO3

(b) BrF3

(d) OSF2

13, The structure of IF7 is *

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(a) Pentagonal bipyramid

(b) Square pyramid

(d) Octahedral

14, Which of the following is a linear molecule? *

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(a) ClO2

(b) CO2

(d) SO2

15, Among the following mixtures, dipole-dipole as the major interaction, is present in *

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(a) benzene and ethanol

(b) acetonitrile and acetone

(d) benzene and carbon tetrachloride

16, The value of universal gas constant R depends on *

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(a) Temperature of Gas

(b) Volume of Gas

(d) Units of Volume,Temperature and Pressure

17, How many of the know elements exist as gases at 25°C?

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(a) 9

(b) 11

(d) 15

Clear selection

18, In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system? *

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(a) 850 kJ

(b) 600 kJ

(d) 250 kJ

19, A system absorb 10 kJ of heat at constant volume and its temperature rises from 270°C to 370°C. The value of ∆ U is *

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(a) 100 kJ

(b) 10 kJ

(d) 1 kJ

20, The enthalpy of vaporisation of a substance is 8400 J mol-1 and its boiling point is –173°C. The entropy change for vaporisation is :

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(a) 84 J mol-1K-1

(b) 21 J mol-1K-1

(d) 12 J mol-1K-1

Clear selection

21,The pH of a 10-10 M NaOH solution is nearest to *

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(a) 10

(b) 7

(d) -10

22, In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will *

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(a) Also be Doubled

(b) Be Halved

(d) Become One-Fourth

23, Among the following the weakest Bronsted base is *

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(a) F–

(b) Cl–

(d) I–

24, Among the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature (about 25°C ) is *

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(a) Mg (OH)2

(b) Ca(OH)2

(d) Be(OH)2

25, Which of the following processes does not involve either oxidation or reduction? *

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(a) Formation of slaked lime from quick lime

(b) Heating Mercuric Oxide

(d) Formation of Zinc from Zinc blende

26, The oxidation state of Cr in Cr (CO)6 is

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(a) 0

(b) 2

(d) 6

Clear selection

27, Which of the following reactions does not involve either oxidation or reduction? *

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(a) VO2+ → V2O3

(b) Na → Na+

(d) Zn2+ →Zn

28, Atomic hydrogen is called *

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(a) Protium

(b) Deutrium

(d) Tritium

29, Solvays process is used for the manufacture of : *

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(a) NaOH

(b) (Na2CO3. 10H2O)

(d) Na2O2

30,Alkali metals give a _________________when dissolved in liquid ammonia *

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(a) Deep blue solution

(b) Colourless

(d) None of the Above

31, The substance not likely to contain CaCO3 is *

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(a) Dolomite

(b) A marble statue

(d) Sea shells

32, The basic strength of which hydroxide is maximum *

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(a) LiOH

(b) NaOH

(d) KOH.

33, The structure of diBorane contains *

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(a) Four 2c – 2e bonds and two 3c – 2e bonds

(b) Two 2c – 2e bonds and two 3c – 2e bonds

(d) Four 2c – 2e bonds and four 3c – 2e bonds

34, Which of the following cannot be represented by resonance structures?

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(a) Dimethyl ether

(b) Nitrate anion

(d) Toluene

Clear selection

35, Which one is strongest acid among following options?

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(a) CH2FCOOH

(b) CH2ClCOOH

(d) CHF2COOH

Clear selection

36, Inductive effect involves

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(a) displacement of σ electrons

(b) delocalization of π electrons

(d) displacement of π-electrons

Clear selection

37, Which of the following behaves both as a nucleophile and as an electrophile?

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(a) CH3C ≡ N

(b) CH3OH

(d) CH3NH2

Clear selection

38, Which element is estimated by Carius method *

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(a) Carbon

(b) Hydrogen

(d) Nitrogen

39, If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that *

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(a) The compound may be a racemic mixture

(b) The compound is certainly a chiral

(d) There is no compound in the solvent.

40, Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80 – 100°C forms which one of the following products?

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(a) 1, 2-Dinitrobenzene

(b) 1, 3-Dinitrobenzene

(d) 1, 2, 4-Trinitrobenzene

Clear selection

41, Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

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(a) –C ≡ N

(b) -SO3H

(d) -NO2

Clear selection

42, Hydrocarbon containing following bond is most reactive

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(a) C ≡ C

(b) C = C

(d) All of these

Clear selection

43, 2 – Phenylpropene on acidic hydration gives *

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(a) 2 – Phenyl – 2 – propanol

(b) 2 – Phenyl – 1 – propanol

(d) 1 – Phenyl – 2 – propanol

44, The catalyst used in Friedel – Crafts reaction is *

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(a) Aluminium Chloride

(b) Anhydrous Aluminium Chloride

(d) Copper

45, Which one of these is not true for benzene? *

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(a) There are three carbon-carbon single bonds and three carbon-carbon double bonds.

(b) Heat of hydrogenation of benzene is less than the theoretical value

(d) The bond angle between carbon-carbon bonds is 120 Degree

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