Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

The units of surface tension and viscosity of liquids respectively are

  • kg m-1s-1, Nm-1

  • kg s-2, kg m-1 s-1

  • Nm-1, kg m-1s-2

  • kg s-1, kg m-2s-1


B.

kg s-2, kg m-1 s-1

From the formula,

Surface tenion (γ) = WA = Jm2 = kg m2 s-2m2 = kg s-2

From the formula, F = η . A . dVdx

or, η = FA . dVdx = Nm2 . ms-1m = Nm-2 . s

or, kg ms-2 . m-2 . s = kg m-1 s-1


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12.

The ratio of volumes of CH3COOH 0.1 (N) to CH3COONa 0.1 (N) required to prepare a buffer solution of pH 5.74 is (Given pKa of CH3COOH is 4.74)

  • 10 : 1

  • 5 : 1

  • 1 : 5

  • 1 : 10


13.

For the reaction, X2Y4 (l) → 2XY2 (g) at 300 K, the values of U and S are 2 kcal and 20 cal K-1 respectively. The value of G for the reaction is

  • -3400 cal

  • 3400 cal

  • -2800 cal

  • 2000 cal


14.

Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is

I. H3N+-CH(CH3)CO2H
II. H2N-CH(CH3)CO2-
III. H3N+-CH(CH3)CO2-
IV.H2N-CH(CH3)CO2H

  • I and II

  • I and III

  • II and III

  • III and IV


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15.

Match the flame colours of the alkaline earth metal salts in the Bunsen burner.

A. Calcium p. Brick red
B. Strontium q. Apple green
C. Barium r. Crimson

  • A - p; B - r; C - q

  • A - r; B - p; C - q

  • A - q; B - r; C - p

  • A - p; B - q; C - r


16.

The major product of the given reaction is


17.

Among Be, B, Mg and Al, the second ionisation potential is maximum for

  • B

  • Be

  • Mg

  • Al


18.

1,4-dimethylbenzene on heating with anhydrous AlCl3 and HCl produces

  • 1, 2-dimethylbenzene

  • 1, 3-dimethylbenzene

  • 1, 2, 3-trimethylbenzene

  • ethylbenzene


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19.

The reaction of methyltrichloroacetate (Cl3CCO2Me) with sodium methoxide (NaOMe) generates

  • carbocation

  • carbene

  • carbanion

  • carbon radical


20.

In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to

  • ferric ferricyanide

  • ferrous ferricyanide

  • ferric ferrocyanide

  • ferrous ferrocyanide


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