Observe the following statements :I. The physical and chemical pr

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

What is the correct order of spin only magnetic moment (in BM) of Mn2+, Cr2+ and V2+ ?

  • Mn2+ > V2+ > Cr2+

  • V2+ > Cr2+ > Mn2+

  • Mn2+ > Cr2+ > V2+

  • Cr2+ > V2+ > Mn2+ 


2.

A molecule (X) has 

(i) four sigma (σ) bonds formed by the overlap of sp2 and s orbitals

(ii) one sigma (σ) bond formed by sp2 and sporbitals and 

(iii) one π bond formed by px and pz orbitals.

Which of the following is X?

  • C2H6

  • C2H3Cl

  • C2H2Cl2

  • C2H4


3.

Which of the following is not correct?

  • 3O2 dischargesilent electric 2O3H = -284.5 kJ

  • Ozone undergoes addition reaction with unsaturated carbon compounds

  • Sodium thuosulphate reacts with I2 to form sodium tetrathionate and sodium iodide.

  • Ozone oxidises lead sulphide to lead sulphate.


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4.

Observe the following statements :

I. The physical and chemical properties of elements are periodic functions of their electronic configuration.

II. Electronegativity of fluorine is less than the electronegativity of chlorine.

III. Electropositive nature decreases from top to bottom in a group.

The correct answer is :

  • I, II and III are correct

  • only I is correct

  • only I and II is correct

  • only II and III are correct


B.

only I is correct

Among all the given statements, statement I is correct. Others can be corrected as-

II. Electronegativity of fluorine is more than the electronegativity of chlorine.

III. Electropositive nature increases from top to bottom in a group because ionization energy decreases.


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5.

The uncertainties in the velocities of two particles A and B are 0.05 and 0.02 m/s-1 respectively. The mass of B is five times to that of mass A. What is the ratio of uncertainities xAxB in their positions?

  • 2

  • 0.25

  • 4

  • 1


6.

The energy of a photon is 3 × 10-12 ergs. What is its wavelength in nm ?

(h = 6.62 × 10-27 ergs ; c = 3 × 1010 cm/s)

  • 662

  • 1324

  • 66.2

  • 6.62


7.

Which of the following set of variables give a straight line with a negative slope when plotted? (P = vapour pressure ; T = Temperature in K)

  • y - axis x - axis
    P T
  • log10 P T
  • log10  1T
  • log10 P log10 1T

8.

Which of the following is not a characteristic property of chemical equilibrium ?

  • Rate of forward reaction is equal to rate of backward reaction at equilibrium.

  • After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time.

  • For A (g)  B (g), Kc is 10-2. If this reaction is carried out in the presence of catalyst, the value of Kc decreases.

  • After reaching the equilibrium, both forward and backward reactions continue to take place.


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9.

The concentration of oxalic acid is 'x' mol L-1. 40 mL of this solution reacts with 16 mL of 0.05 M acidified KMnO4. What is the pH of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociates completely)

  • 1.3

  • 1.699

  • 1

  • 2


10.

Which of the following is not correct ?

  • Nuclei of atoms participate in nuclear reactions

  • 20Ca40 and 18Ar40 are isotones

  • 1 amu of mass defect is approximately equal to 931.5 MeV.

  • Uranium (U238) series is known as (4n + 2) series.


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