At 25°C, the solubility product of salt of MX2 type is 3.2 × 10-8 in water. The solubility (in mol/L) of MX2 in water at the same temperature will be
1.2 × 10-3
2 × 10-3
3.2 × 10-3
1.75 × 10-3
In SOCl2, the Cl-S-Cl and Cl-S O bond angles are
130° and 115°
106° and 96°
107° and 108°
96° and 106°
In O2 and H2O2 , the O-O bond lengths are 1.21 and 1.48 Å respectively. In ozone, the average O-O bond length is
1.28 Å
1.18 Å
1.44 Å
1.52 Å
The different colours of litmus in acidic, neutral and basic solutions are, respectively.
red, orange and blue
blue, violet and red
red, colourless and blue
red, violet and blue
The correct order of equivalent conductances at infinite dilution in water at room temperature for H+, K+, CH3COO- and HO- ions is
HO- > H+ > K+ > CH3COO-
H+ > HO- > K+ > CH3COO-
H+ > K+ > HO- > CH3COO-
H+ > K+ > CH3COO- > HO-
For a chemical reaction at 27°C, the activation energy is 600 R. The ratio of the rate constants at 327°C to that of at 27°C will be
2
40
e
e2
A van der Waals' gas may behave ideally when
the volume is very low
the temperature is very high
the pressure is very low
the temperature, pressure and volume all are very high
In diborane, the number of electrons that accounts for bonding in the bridges is
six
two
eight
four