The mass of carbon anode consumed (giving only carbondioxide) in

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass Al= 27)

  • 180 kg

  • 270 kg

  • 540 kg

  • 90 kg


D.

90 kg

In Hall and Heroult process

2Al2O3  4Al + 3O2

4C + 3O2  2CO2 + 2CO 

2Al2O3 + 4C 4Al + 2CO2 + 2CO

Only for removal of CO2, following equation is possible

2Al2O3 + 3C 4Al + 3CO2

Molecular weight of Carbon = 12

Molecular weight of Aluminium = 27

 For Carbon/ C = 3 x 12 = 36

    For Aluminium/ Al = 4 x 27 = 108

 For 108 gm of Al, 36 gm of C is required in above reaction

 For 270 gm of Al require amount of C = 36108 × 270 =90 gm


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2.

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

  • one-fifth

  • five

  • one

  • two


3.

Which of the following molecules has trigonal planar geometry?

  • IF3

  • PCl3

  • NH3

  • BF3


4.

A reaction occurs spontaneously if

  • TS < H and both H and S are +ve

  • TS > H and both H and S are +ve

  • TS = H and both H and S are +ve

  • TS > H and H is +ve and S is - ve


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5.

The correct sequence of increasing covalent character is represented by

  • LiCl < NaCl < BeCl2

  • BeCl2 < NaCl < LiCl

  • NaCl < LiCl < BeCl2

  • BeCl2 < LiCl < NaCl


6.

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

  • Exothermic and decreasing disorder

  • Endothermic and increasing disorder

  • Exothermic and increasing disorder

  • Endothermic and decreasing disorder


7.

Which of the following is the electron deficient molecule?

  • B2H6

  • C2H6

  • PH3

  • SiH4


8.

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three α-particles in succession. The group of the periodic table to which the resulting daughter element would belong to

  • Group 14

  • Group 16

  • Group 4

  • Group 6


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9.

The absolute enthalpy of neutralisation of the reaction

MgO(s) + 2HCl(aq)  MgCl2(aq) + H2O(l)

will be

  • less than - 57.33 kJ mol-1

  • - 57.33 kJ mol-1

  • greater than-- 57.33 kJ mol-1

  • 57.33 kJ mol-1


10.

Equilibrium constants K1 and K2 for the following equilibria
NO (g) + 12O2  K1 NO2(g) and

2NO2(g) K2 2NO (g) + O2(g)

are related as

  • K2 = 1 K1

  • K2 = K12

  • K2 = K12

  • K2 =1K12


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