1
###
(ΔH – ΔU) for the formation of carbon monoxide (CO)

(ΔH – ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8.314 JK^{–1} mol^{–1})

- 1238.78 J/mol
- 2477.57 J/mol
- –2477.57 J/mol
- –1238.78 J/mol

2
###
In conversion of limestone to lime

In conversion of limestone to lime,

CaCO_{3}(s) → CaO(s) + CO_{2}(g)

The values of ΔH° and ΔS° are +179.1 kJ/mol and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ΔH° and ΔS° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is

- 1200 K
- 1118 K
- 1008 K
- 845 K

3
###
Standard entropy of X2, Y2 and XY3 are 60, 40 and 50

Standard entropy of X_{2}, Y_{2} and XY_{3} are 60, 40 and 50 J K^{–1} mol^{–1}, respectively. For the reaction, 1/2 X_{2} + 3/2 Y_{2} → XY_{3}, ΔH = –30 kJ, to be at equilibrium, the temperature will be

- 500 K
- 750 K
- 1000 K
- 1250 K

4
###
The heat required to raise the temperature of 1 mole substance by 1°C

The heat required to raise the temperature of 1 mole substance by 1°C is called

- Thermal capacity
- Molar heat capacity
- Specific heat
- None of these

5
###
The enthalpy change for a reaction does not depend upon the

The enthalpy change for a reaction does not depend upon the

- use of different reactants for the same product.
- nature of intermediate reaction steps.
- physical states of reactants and products.
- difference in initial or final temperatures of involved substances.

6
###
The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively

The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number = 6.02×10^{23}, h = 6.62×10^{-34} J s):

- 1.49×10
^{3}nm - 2.48×10
^{3}nm - 2.48×10
^{4}nm - 1.49×10
^{4}nm

7
###
The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5

The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5 kJ mol^{–1}, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:

- 676.5
- –676.5
- –110.5
- 110.5

Consider the graph in which the birthrate and death rate of a country
Which frequency range is sensitive to human ears
log12 81 = p, then 3[(4-p)/(4+p)] is equal to
A right circular cone, of height 12 ft, stands on its base
Points E, F, G, H lie on the sides AB, BC, CD, and DA
While multiplying three real numbers, Ashok took one of the numbers
If x is a positive quantity such that 2x = 3^log5 2, then x is equal to
If u^2 + (u − 2v − 1)^2 = −4v(u + v), then what is the value of u + 3v