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
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
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
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)CO
III. H3N+-CH(CH3)CO
IV.H2N-CH(CH3)CO2H
I and II
I and III
II and III
III and IV
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
1,4-dimethylbenzene on heating with anhydrous AlCl3 and HCl produces
1, 2-dimethylbenzene
1, 3-dimethylbenzene
1, 2, 3-trimethylbenzene
ethylbenzene
The reaction of methyltrichloroacetate (Cl3CCO2Me) with sodium methoxide (NaOMe) generates
carbocation
carbene
carbanion
carbon radical
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
C.
ferric ferrocyanide
To a part of sodium extract, FeSO4 solution is added and the contents are warmed. A few drops of FeCl3 solution are then added and resulting solution is acidified with conc. HCl. Bluish green or Prussian blue colour is formed and it confirms the presence of nitrogen. The reactions that occur during this test are -
2NaCN + FeSO4 → Na2SO4 + Fe(CN)2
Fe(CN)2 + 4NaCN →
3Na4 [Fe(CN)6] + 4FeCl3 → + 12 NaCl