CBSE
Multiple Choice QuestionsWhich of the following is correct?
Evaporation of water causes an increase in disorder of the system
Melting of ice causes a decrease in the randomness of the system
Condensation of steam causes an increase in disorder of the system
There is practically no change in the randomness of the system when water is evaporated
Equal volumes of molar hydrochloric acid 'and sulphuric acid are neutralized by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true ?
x = y
x =y/2
x = 2y
none of these
The product p of the nuclear reaction
, is
The second law of thermodynamic says that in a cyclic process
work cannot be converted into heat
heat cannot be converted into work
work cannot be completely converted into heat
heat cannot be completely converted into work
For which reaction change of entropy will be positive?
H2(g) + I2(g) 2HI (g)
HCl (g) + NH3 (g) NH4Cl (s)
NH4NO3 (s) N2O (g) + 2H2O (g)
MgO(s) + H2(g) Mg(s) + H2O(l)
Which of the following thermodynamic relation is correct ?
dG = Vdp- SdT
dE = pdV + TdS
dH = -Vdp + Tds
dG = Vdp + SdT
The amount of the heat released when 20 mL 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is x kJ. The heat of neutralisation is:
- 100 x kJ/mol
- 50 x kJ/mol
+ 100 x kJ/mol
+ 50 x kJ/mol
Given that,
C + O2 → CO2 ; H = -x kJ
2CO + O2 → 2CO2 ;H = -y kJ
The heat of formation of carbon monoxide will be
y + 2x
2x - y
Calculate Kc for the reversible process given below if Kp = 167 and T = 800°C
CaCO3 (s) CaO (s) + CO2 (g)
1.95
1.85
1.89
1.60
For a spontaneous process, the correct statement(s) is (are)
(Gsystem)T, p > 0
(Ssystem) + (Ssurroundings) > 0
(Gsystem)T, p < 0
(Usystem)t, v > 0
