Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The pH value of decinormal solution of NH4OH which is 20% ionised is

  • 12.95

  • 12.30

  • 14.70

  • 13.30


12.

Which of the following option w.r.t. increasing bond order is correct ?

  • NO < C<O2<He2+

  • C< NO < He2< O2-

  • He2< O2< NO  < C2

  • He2< O2< C< NO.


13.

In which of the following reaction Kp> Kc ?

  • PCl3 + Cl3 PCl5

  • H2+I2 2HI

  • 2SO3  O2 + 2SO2

  • N2+ 3H2  2NH3


14.

Which of the following is a characteristic of a reversible reaction?

  • It never proceeds to completion

  • It can be influenced by a catalyst

  • It proceeds only in forward direction

  • Number of moles of reactants and products are equal.


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15.

How many litres of ammonia gas at S.T.P. would 1 be needed to prepare 100 ml of 2.5 M ammonium hydroxide solution?

  • 5.6 L

  • 0.056 L

  • 11.2 L

  • 0.56 L


A.

5.6 L

Molecular weight of NH4OH= 35

Now, 35 g of NH,OH is needed to prepare 1 M solution in 1 litre
= 35 g NH4OH in 1L solution= 1 molar solution
= 2.5 x 35 g NH4OH in I L solution es 2.5 molar solution

2.5 × 3.510 g NH4OH is mL solution = 2.5 molar solution

8.75 g NH4OH was dissloved.

NH3 + H2O  NH4OHFor 35 g NH4OH, NH3 needed = 22.4 L at S.T.Pfor 8.75 g NH4OH, NH3 needed = 22.435×8.75 L = 5.6L


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16.

The equilibrium constant of a reaction is 300. If the volume of a reaction flask is trippled, the equilibrium constant will be

  • 300

  • 100

  • 600

  • 150


17.

Which of the following is the correct sequence of atomic weights of the given elements?

  • Ni> Co> Fe

  • Fe> Co> Ni

  • Co> Fe> Ni

  • Co> Ni> Fe


18.

A solution with pH = 2 is more acidic than one with a pH =6, by a factor of

  • 4000

  • 5000

  • 8000

  • 10,000


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19.

The BCl3, is a planar molecule where as NCl3, is pyramidal. because

  • B-Cl bond is more polar than N-Cl bond

  • N-Cl bond is more covalent than B-Cl bond

  • nitrogen atom is smaller than boron atoms

  • BCl has no lone pair but NCl3 has a lone pair of electrons.


20.

If 0.189 g of a chlorine containing organic compound gave 0.287 g of silver chloride, then the percentage of chlorine in the organic compound is

  • 35.47

  • 35.57

  • 37.57

  • 45.37


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