The temperature of 5 ml of a strong acid increases by when 5 ml of a strong base is added to it. If 10 ml of each is mixed, temperature should increase by-
1.
2.
3.
4. cannot be known
The heat of neutralisation of HCl by NaOH is -55.9 kJ/mole. If the heat of neutralisation of HCN by NaOH is -12.1 kJ/mole, then energy of dissociation of HCN is-
1. -43.8 kJ
2. 43.8 kJ
3. 68 kJ
4. -68 kJ
Using only the following data:
(I)
(II)
the value, in kilojoules, for the reaction
is calculated to be:
1. -43.3
2. -10.3
3. +6.2
4. +10.3
82 litres of carbon dioxide are produced at a pressure of 1 atm by the action of acid on a metal carbonate. The work done at room temp by the gas (in calories) in pushing back the atmosphere is
1. 1000
2. 820
3. 1640
4. 2200
Among the following, the reaction for which is-
1.
2.
3.
4.
Enthalpy change when 1.00 g water is frozen at is :
1. 0.0797 kcal
2. -0.0797 kcal
3. 1.435 kcal
4. -1.435 kcal
One mole of hydrogen gas at and 1 atm pressure is heated at constant pressure until its volume has doubled. Given that for hydrogen is 3.0 cal deg-1 mol-1, the and for this process are-
1. = 1490 cal and = 894 cal
2. = = 1490 cal
3. = 894 cal and = 1490 cal
4. = = 894 cal
The enthalpy change of the reaction
is -257 kcal.
Given the heat of formation of NaCl(s) is 98.0 kcal, the heat of formation of is-
1. 158 kcal
2. -331 kcal
3. -166 kcal
4. 316 kcal