reaction is not possible because Br– ion is not
oxidised in Br2 with I2 due to higher electrode
(oxidation) potential of I2 than bromine.
3
AIPMT 2002
MCQ (Single Correct Answer)
Heat of combustion $$\Delta $$Ho for C(s), H2(g) and CH4(g) are $$-$$ 94, $$-$$ 68 and $$-$$213 kcal/mol, then $$\Delta $$Ho for C(s) + 2H2(g) $$ \to $$ CH4(g) is
In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is true ?
A
$$\Delta $$E = W $$ \ne $$ 0, q = 0
B
$$\Delta $$E = w = q $$ \ne $$ 0
C
$$\Delta $$E = 0, W = q $$ \ne $$ 0
D
W = 0, $$\Delta $$E = q $$ \ne $$ 0.
Explanation
When in a closed insulated container, a liquid
is stirred, it increases the temperature of liquid thus
it started behaving as adiabatic process resulting
no change in heat and only temperature increases.
Therefore, q = 0 for this process.
Also, $$\Delta $$E = q + W
$$\Delta $$E = W (As, q = 0)
As, there is rise in temperature thus, there must be
change in internal energy, i.e., $$\Delta $$E = W ≠ 0.
Questions Asked from Thermodynamics
On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions