# In a 500ml flask,the degree of dissociation of PCl5 at equilibrium is 40% and the initial amount in 5 moles.The value of equilibrium constant in mol lit-1 for the decomposition of PCl5 is

1.  2.33

2.  2.66

3.  1.33

4.  4.66

4

2.66

Explanation :
No Explanation available for this question

# The Ka of a weak acid is 10-5,pKb value of its conjugate base is

1.  7

2.  5

3.  9

4.  6

4

9

Explanation :
No Explanation available for this question

# The hydronium ion concentration of a solution is 1X10-4 M at 250 C.The hydroxide ion concentration in the same solution is

1.  1X10-14 M

2.  1X10-7 M

3.  1X10-10 M

4.  1X10-4 M

4

1X10-10 M

Explanation :
No Explanation available for this question

# The strength of acid is highest in

1.  pKa=6

2.  pKa=5

3.  pKa=10

4.  Ka=10-11

4

pKa=5

Explanation :
No Explanation available for this question

# The hydrolysis constant Kh of a salt of NaOH and a weak acid (HX) If the Ka of the acid is Ka=2x10-6

1.  5x10-8

2.  5x10-6

3.  5x10-9

4.  2.5x10-7

4

5x10-9

Explanation :
No Explanation available for this question

# Calculate the hydrolysis constant of a salt of a weak acid(Ka=2x10-6) and of a weak base(Kb=5x10-7)

1.  10-4

2.  10-2

3.  10-6

4.  10-8

4

10-2

Explanation :
No Explanation available for this question

# 5 moles of acid is required to change the pH of 1 litre of buffer by 2units.Find buffer capacity.

1.  5

2.  3.5

3.  2.5

4.  15

4

2.5

Explanation :
No Explanation available for this question

# The solubility product of NaCl is 2.5x10-9moles2/lit2.Its solubility is

1.  2.5x10-9 mol/lit

2.  5x10-5 mol2

3.  5x10-5 mol/lit

4.  1.3x10-5 mol

4

5x10-5 mol/lit

Explanation :
No Explanation available for this question

# Ksp of BaCl2 is(solubility of BaCl2 is S mole/litre)

1.  4S2

2.  5S3

3.  4S3

4.  64S3

4

4S3

Explanation :
No Explanation available for this question

1.  4KSP

2.  KSP/4

3.  3√KSP/4)

4.  √(K/4)

4