Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Base strength of 

1. space straight H subscript 3 straight C straight C with minus on top straight H subscript 2
2. space straight H subscript 2 straight C equals straight C with minus on top straight H
3. space straight H minus space straight C identical to straight C with minus on top

is in the order of 

  • (2) > (1) > (3)

  • (3) > (2) > (1) 

  • (1) > (3)> (2) 

  • (1) > (3)> (2) 

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12.

What volume of oxygen gas (O2) measured at 0oC and 1 atm, is needed to burn completely 1 L of propane gas (C3H8)  measured under the same conditions?

  • 7 L

  • 6 L 

  • 5 L 

  • 5 L 


C.

5 L 

Volume of a gas at STP = 22.4 L 

C38 +    5O2 → 3CO2 + 4H2O
22.4 L       5 x 22.4 L

Therefore,
to burn 22.4 L C3H8 the oxygen required is 
 = 5 x 22.4 L 

To burn 1 L C3H8  the oxygen required will be  = 5 x 22.4 / 22.4  = 5 L 

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13.

Equimolar solutions of the following  were prepared in water separately which one of the solutions will record the highest pH? 

  • SrCl2

  • BaCl2

  • MgCl2

  • MgCl2

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14.

The measurment of the electron position is associated with an uncerrtanity in momentum, which equal to 1 x 10-18 g cm s-1.The uncertanity in electron velocity is,

(mass of an electrons is 9 x 10-28 g) 

  • 1 x 108

  • 1  x 106 cm s-1

  •  1 x 105 cm s-1

  •  1 x 105 cm s-1

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15.

The correct order of increasing bond angles in the following triatomic species is 

  • NO subscript 2 superscript minus space less than thin space NO subscript 2 superscript plus space thin space less than space NO subscript 2
  • NO subscript 2 superscript minus space less than thin space NO subscript 2 space less than thin space NO subscript 2 superscript plus
  • NO subscript 2 superscript plus space less than thin space NO subscript 2 space less than thin space NO subscript 2 superscript minus
  • NO subscript 2 superscript plus space less than thin space NO subscript 2 space less than thin space NO subscript 2 superscript minus
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16.

Four diatomic solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

  • straight O subscript 2 superscript minus space less than thin space NO space less than thin space straight C subscript 2 superscript 2 minus end superscript space less than thin space He subscript 2 superscript plus
  • NO less than thin space straight C subscript 2 superscript 2 minus end superscript space less than thin space straight O subscript 2 superscript minus space less than thin space He subscript 2 superscript plus
  • straight C subscript 2 superscript 2 minus end superscript space less than space He subscript 2 superscript plus less than thin space NO thin space less than thin space straight O subscript 2 superscript minus
  • straight C subscript 2 superscript 2 minus end superscript space less than space He subscript 2 superscript plus less than thin space NO thin space less than thin space straight O subscript 2 superscript minus
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17.

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

  • CH3O

  • CH2O

  • CHO

  • CHO

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18.

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

  • 0.044

  • 0.333

  • 0.011

  • 0.011

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19.

Bond dissociation enthalpy of H2, Cl2 and HCl and 434, 242 and 431 kJ mol-1 respectively.  Enthalpy of formation of HCl is 

  • 93 kJ mol-1

  • -245 kJ mol-1

  • -39 kJ mol-1

  • -39 kJ mol-1

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20.

The dissociation equilibrium  of gas AB2 can be represented as

2AB2 (g) ⇌ 2AB (g) + B2 (g)
The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation  (x) with equilibrium constant Kp and total pressure p is 

  • (2Kp / p)

  • (2Kp/p)1/3

  • (2Kp/p)1/2

  • (2Kp/p)1/2

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