Equilibrium Questions

The exothermic formation of ${\text{ClF}}_3$ is represented by the equation:
$${\text{Cl}}_2(g)+3{\text{F}}_2(g)\rightleftharpoons 2{\text{ClF}}_3(g);{\Delta }_{r}H=-329\text{kJ}$$
Which of the following will increase the quantity of ${\text{ClF}}_3$ in an equilibrium mixture?

For the reaction: $2{\text{NO}}_2(g)\rightleftharpoons 2\text{NO}(g)+{\text{O}}_2(g)$, it is found that at $184^{\circ }\text{C}$, $K_c=1.8\times 10^{-6}$. When $K_p$ and $K_c$ are compared at this temperature, it is found that:

Hydrogen ion concentration in $\text{mol/L}$ in a solution of $\text{pH}=5.4$ will be:

What is the conjugate base of ${\text{OH}}^{-}$?

Solid ${\text{NH}}_4\text{HS}$ is placed in a flask containing ${\text{NH}}_3$ at $0.50\text{atm}$. It decomposes into ${\text{NH}}_3$ and ${\text{H}}_2\text{S}$. At equilibrium, total pressure is $0.84\text{atm}$. $K_p$ is:

The solubility product of a salt having general formula ${\text{MX}}_2$, in water is $4\times 10^{-12}$. The concentration of ${\text{M}}^{2+}$ ions in the aqueous solution of the salt is:

A charged oil drop is suspended in a uniform field of $3\times 10^4\text{V/m}$ so that it neither falls nor rises. The charge on the drop will be: (Take mass of the drop $=9.9\times 10^{-15}\text{kg}$ and $g=10{\text{m/s}}^2$)

A mass of $M\text{kg}$ is suspended by a weightless string. The horizontal force $F$ that is required to displace it until the string makes an angle of $45^{\circ }$ with the initial vertical direction is:

At $25^{\circ }\text{C}$, the solubility product of ${\text{Mg(OH)}}_2$ is $1.0\times 10^{-11}$. At which pH, will ${\text{Mg}}^{2+}$ ions start precipitating in the form of ${\text{Mg(OH)}}_2$ from a solution of $0.001{\text{M Mg}}^{2+}$ ions?

Solubility product of silver bromide is $5.0\times 10^{-13}$. The quantity of potassium bromide (molar mass taken as $120{\text{g mol}}^{-1}$) to be added to $1\text{litre}$ of $0.05\text{M}$ solution of silver nitrate to start the precipitation of $\text{AgBr}$ is:

In aqueous solution the ionization constants for carbonic acid are $K_1=4.2\times 10^{-7}$ and $K_2=4.8\times 10^{-11}$. Select the correct statement for a saturated $0.034\text{M}$ solution of the carbonic acid.

Three reactions involving ${\text{H}}_2{\text{PO}}_4^{-}$ are given below:(i) ${\text{H}}_3{\text{PO}}_4+{\text{H}}_2\text{O}\to {\text{H}}_3{\text{O}}^{+}+{\text{H}}_2{\text{PO}}_4^{-}$ (ii) ${\text{H}}_2{\text{PO}}_4^{-}+{\text{H}}_2\text{O}\to {\text{HPO}}_4^{2-}+{\text{H}}_3{\text{O}}^{+}$ (iii) ${\text{H}}_2{\text{PO}}_4^{-}+{\text{OH}}^{-}\to {\text{H}}_3{\text{PO}}_4+{\text{O}}^{2-}$ (Inconsistent stoichiometry)In which of the above does ${\text{H}}_2{\text{PO}}_4^{-}$ act as an acid?

The molar solubility product of a salt ${\text{A}}_2{\text{B}}_3$ is $K_{sp}$. The solubility '$s$ ' is given in terms of $K_{sp}$ by the relation:

The equilibrium constant for the reaction ${\text{N}}_2(g)+{\text{O}}_2(g)\rightleftharpoons 2\text{NO}(g)$ at temperature $T$ is $4\times 10^{-4}$. The value of $K_c$ for the reaction $\text{NO}(g)\rightleftharpoons \frac{1}{2}{\text{N}}_2(g)+\frac{1}{2}{\text{O}}_2(g)$ at the same temperature is:

For the reaction, $\text{CO}(g)+{\text{Cl}}_2(g)\rightleftharpoons {\text{COCl}}_2(g)$ the $\frac{K_p}{K_c}$ is equal to:

What is the equilibrium expression for the reaction ${\text{P}}_4(s)+5{\text{O}}_2(g)\rightleftharpoons {\text{P}}_4{\text{O}}_{10}(s)$?

The conjugate base of ${\text{H}}_2{\text{PO}}_4^{-}$ is:

A horizontal force of $10\text{N}$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. The weight of the block is: