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
Among Be, B, Mg and Al, the second ionisation potential is maximum for
B
Be
Mg
Al
A.
B
Among B, Be, Mg and Al, Boron has the second highest ionisation potential. Both Beryllium and Magnesium belong to group II A and Boron and Aluminium belongs to group III A.
Electronic configuration of boron is 2s22p1 whereas electronic configuration of B+ is 2s2. Hence, it is difficult to remove second electron from 2s2 shell as half filled and fully filled orbitals are more stable than others.
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