One mole of hydrogen iodide is heated in a closed container of capacity 2 liters. At equilibrium half a mole of hydrogen iodide is dissociated. The equilibrium constant is

1) 1.00
2) 0.50
3) 0.25
4) 0.75

Starting with three different amino acid molecules, how many different tripeptide molecules could be formed ?

1) 12
2) 9
3) 3
4) 6

Which one of the following types of medicines is used for treating indigestion?

1) Antibiotic

2) Analgesic

3) Antacid

4) Antispetic

The standard free energy changes for the reactions:
2H_2(g) + O_2(g) ? 2H₂O_(g) and CO_(g) + H₂O_(g) ? CO_2(g) + H_2(g) are - 457.0 kJ and - 28.5 kJ respectively. Standard free energy for the reaction: 2CO₂ ? 2 CO_(g) + O_2(g) will be:

1) – 514.0 kJ
2) – 485.4 kJ
3) 484.4 kJ
4) 514.0 kJ

The equilibrium constant for the decomposition of water H₂O(g) -> H₂(g) + 1/2 O₂(g) is given by : (α = degree of dissociation of H₂O (g) ; p = Total equilibrium pressure )

K_c for a gaseous state reversible reaction is 300 mol^-2 L² at 127^oC. Hence, K_p of the reaction will be

1) 300 × (8.314 × 400)² atm²
2) 300 × (8.314 × 127)² atm²
3) 300 × (0.082 × 400)^-2 atm^-2
4) 300 × (0.082 × 300) atm

In the reaction shown below, the major product(s) formed is/are

CsBr has b.c.c. structure with edge length 4.3 A. The shortest inter ionic distance in between Cs⁺ and Br^– is:

1)  4.3
2)  1.86
3)  7.44.
4)  3.72

Which one of the following acid possesses oxidising, reducing and complex forming properties?

1) HNO₃
2) HC1
3) H₂SO₄
4) HNO₂

The order of stability of the following carbocations:

1)  III > II > I   
2)  II > III > I  
3)  I > II > III 
4)  III > I > II