491.

The aqueous solution of which of the salt has pH close to 7?

• FeCl₃

• CH₃COONa

• KCN

• CH₃COONH₄

Consider the following reactions in which all the reactants and the products are in gaseous state

  $$\begin{gathered} 2\mathrm{PQ} \rightleftharpoons {\mathrm{P}}_2 + {\mathrm{Q}}_2; {\mathrm{K}}_1 = 2.5 \times {10}^5 \\ \mathrm{PQ} + \frac{1}{2}{\mathrm{R}}_2 \rightleftharpoons \mathrm{PQR}: {\mathrm{K}}_2 = 5 \times {10}^{-3} \\ \mathrm{The} \mathrm{value} \mathrm{of} {\mathrm{K}}_3 \mathrm{for} \mathrm{the} \mathrm{equilibrium} \frac{1}{2}{\mathrm{P}}_2 +\frac{1}{2}{\mathrm{Q}}_2 +\frac{1}{2}{\mathrm{R}}_2 \rightleftharpoons \mathrm{PQR}, \mathrm{is} \end{gathered}$$

• 2.5 × 10^-3

• 2.5 × 10³

• 1.0 × 10^-5

• 5 × 10³

At a certain temperature, the dissociation constants of formic acid and acetic acid are 1.8 × 10^-4 and 1.8 × 10^-5 respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to 

• 0.01 M

• 0.001 M

• 0.1 M

• 0.0001 M

What is the overall formation equilibriumconstant for the ion [ML₄]^2- ion, given that β₄ for this complex is 2.5 × 10¹³?

• 2.5 × 10¹³

• 5 × 10^-13

• 2.5 × 10^-14

• 4.0 × 10^-13

1.6 moles of PCl₅(g) is placed in 4 dm closed vessel. When the temperature is raised to 500 K, it decomposes and at equilibrium 1.2 moles of PCl₅(g) remains. What is the K, value for the decomposition of PCl₅(g) to PCl₃(g) and Cl₅(g) at 500 K?

• 0.013

• 0.050

• 0.033

• 0.067

For a concentrated solution of a weak electrolyte A_xB_y of concentration 'C', the degree of dissociation 'a' is given as

• α = √ K_eq/ C ( x + y)

• α = √ K_eq/ C ( xy)

• α =( K_eq/ Cxy)

• α =( K_eq/ C^xy)

The strongest base among the following is

• C₆H₅NH₂

• (C₆H₅)₂NH

• NH₃

• (C₂H₅)₂NH

$\mathrm{A}\left(\mathrm{g}\right) + 3\mathrm{B}\left(\mathrm{g}\right)\hspace{0.17em} \rightleftharpoons 4\mathrm{C}\left(\mathrm{g}\right)$.Initially concentration of A is equal to that of B. The equilibrium concentrations of A and C are equal. K_c is 

• 0.08

• 0.8

• 8

• 80

Match List-I with List-II Choose the correct matching codes from the choices given.

List - I (Hydride)	List - II (Type of hydride)
A. BeH2	1. Complex
B. AsH3	2. Lewis acid
C. B2H6	3. Interstitial
D. LaH3	4. Covalent
E. LiAlH4	5. Intermediate 6. Ionic

• A - 6; B - 2; C - 4; D - 5; E - 1

• A - 5; B - 4; C - 2; D - 3; E - 1

• A - 6; B - 4; C - 2; D - 3; E - 5

• A - 6; B - 4; C - 2; D - 3; E - 1

Two moles of PCl₅, is heated in a closed vessel of 2 L capacity. When the equilibrium is attained 40% of it has been found to be dissociated. What is the K_c in mol/dm³?

• 0.532

• 0.266

• 0.133

• 0.174