Thermodynamics ...

Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. Specific heat of iron at 25°C and 1.00 bar is

A rather soft, silvery metal was observed to have a specific heat of 0.225 cal K^-1g^-1. Thus, metal is

Specific heat of water is 4.184 JK^-1g^-1, Rise in temperature when 1 kJ of heat is absorbed by 2 moles of H₂O is

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 neutralization is 

The heat capacity ratio, r was determined for cyanogen as 1.177. Thus, C_p for this gas is

Assuming the composition of air to be X (N₂) = 0.80, X (O₂) = 0.18 and X (CO₂) = 0.02, molar heat capacity of air at constant pressure is

Latent heat of fusion of ice is 6.02 kJ mol^-1. The heat capacity of water is 4.18 Jg^-1K^-1. 500 g of liquid water is to be cooled from 20°C to 0°C . Number of ice cubes (each of one mole) required is

Sulphur (2.56 g) is burned in a constant volume calorimeter with excess O₂(g). The temperature increases from 21.25°C to 26.72°C . The bomb has a heat capacity of 923 JK^-1. Calorimeter contains 815 g of water. Thus, change in internal energy per mole of SO₂ formed for the reaction is

(specific heat of water is 4.184 JK^-1g^-1.)

Direction (Q. Nos. 9) This sectionis based on statement I and Statement II. Select the correct answer from the code given below.

Q.

Statement I : C_v value of helium (He) is always 3/2R but C_v value of hydrogen (H₂) is 3/2R at low temperature, 5/2R at moderate temperature and more than 5/2R at higher temperature.

Statement II : At lower temperature, only translational degree of freedom contributes to heat capacity while at higher temperature, rotational and vibrational degrees of freedom also contribute to heat capacity.

Direction (Q. Nos. 10) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q. According to the classical equipartition of energy theory, the contributions to the molar heat capacity at constant volume are for each degree of translational freedom,  for each degree of rotational freedom and (R) for each degree of translational freedom. Match the species in Column I with the values of molar heat capacity (C_p or C_V) in Column II and select answer from codes given below the table.