The weight of one molecule of a compound C60H120 is :
1.2 x 10-20 g
5.025 x 1023 g
1.4 x 10-21 g
6.023 x 1023 g
Quantum numbers of an atom can be defined on the basis of :
Hund's rule
Pauli's exclusion principle
Aufbau's principle
Heisenberg's uncertainty principle
At 80°C, distilled water has H+ ions concentration equal to 1 x 10-6 mole/litre. The value of KW at this temperature will be :
1 X 10-6
1 X 10-12
1 X 10-9
1 X 10-15
The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is :
(pKa for CH3COOH = 4.57)
4.09
6.09
5.09
7.09
C.
5.09
According to Henderson's equation,
pH = pKa + log
CH3COOH + NaOH CH3COONa + H2O
Putting the values, we get :
pH = 4.57 + log
pH = 5.09
The heat of neutralization of a strong base and a strong acid is 57 kJ. The heat released when 0.5 mole of HNO3 solution is added to 0.20 moles of NaOH solution, is :
11.4 kJ
34.7 kJ
23.5 kJ
58.8 kJ
The solubility of CuBr is 2 x 10-4 mol/L at 25°C. The KSP value for CuBr is :
4 x 10-8 mol2 L-2
4 x 10-4 mol2 L-2
4 x 10-11 mol2 L-2
4 x 10-15 mol2 L-2