# Calculate ∆H0 for the reaction Na2O(s) + SO3 (g)→ Na2SO4(g) given the following1. Na(s) + H

1.  +823 kJ

2.  - 581 kJ

3.  -435 kJ

4.  +531 kJ

4

- 581 kJ

Explanation :
No Explanation available for this question

# Which one of the following is most effective in causing the coagulation of an As2S3 sol

1.  KCl

2.  AlCl3

3.  MgSO4

4.  K3Fe(CN)6

4

AlCl<sub>3</sub>

Explanation :
No Explanation available for this question

# A metal nitride contains 28% nitrogen by weight. The molecular formula of metal nitride is M3N2 What is the atomic weight of metal

1.  72

2.  64

3.  100

4.  24

4

24

Explanation :
No Explanation available for this question

# Which one of the following statements Is not correct

1.  The fraction of total number of molecules of a gas having most probable velocity increases with an increase in temperature of the gas

2.  The concentration of an ideal gas at 100 K and 0.0821 atm. of pressure is 1.0 x 10-2 mol. Lit-1 (R = 0.0821 lit. atm. Mol-1K-1)

3.  If the rms velocity of an ideal gas at T(K) is 'C’ cm. s-1, its rms velocity at 4T(K) is '2C’ cm.s-1

4.  The average kinetic energy of gas molecules is proportional to their absolute temperature

4

The fraction of total number of molecules of a gas having most probable velocity increases with an increase in temperature of the gas

Explanation :
No Explanation available for this question

# In acidic medium, 100 ml of 0.01 M KMnO4 solution oxidizes 100 ml of H2O2 solution. The volume of 0.01 M KMnO4 required to oxidize the sa

1.  300/2

2.  300/5

3.  500/3

4.  500/2

4

500/3

Explanation :
No Explanation available for this question

# A solution of 10 g of a non-volatile binary electrolyte (mol. wt. = 100) in 500g  of water freezes at -0.74oC. What is the degree of ionization (kf  of water = 1.85

1.  5%

2.  75%

3.  100%

4.  0%

4

100\%

Explanation :
No Explanation available for this question

# An electronic transition in hydrogen atom results in the formation of Hα line of hydrogen in Lyman series, the energies associated with the electron in each of the orbits involved in the transition

1.  -313.6, -34.84

2.  -313.6, -78.4

3.  -78.4, -34.84

4.  -78.4, -19.6

4

-313.6, -78.4

Explanation :
No Explanation available for this question

# The velocities of two particles A and B are 0.05 and 0,02 ms-1  respectively. The mass of B is five times the mass of A The ratio of their de Broglie's wavelength is

1.  2 : 1

2.  1 : 4

3.  1 : 1

4.  4 : 1

4

2 : 1

Explanation :
No Explanation available for this question

# If the mass defect of 5B11 is 0.081 amu, its average binding energy (in MeV) is

1.  8.60

2.  6.85

3.  5.60

4.  5.86

4

6.85

Explanation :
No Explanation available for this question

# The atomic numbers of elements A, B, C and D are z - 1, z, z + 1 and z + 2, respectively. If 'B' is a noble gas, choose the correct answers from the following statements: (1) 'A' has higher electron affinity.(

1.  (1)and(2)

2.  (2)and(3)

3.  (1)and(3)

4.  (1), (2) and (3)

4