P. Bahadur Test: Equilibrium - JEE MCQ

since at eqm conc of reactant and product doesnot change therefore intensity of color did not change.​

The particular ratio is called as reaction quotient which is compared to a given k value and then the direction of equilibrium iis decided.

BF₃ is an electron deficient compound. Hence, it acts as Lewis acid. NH₃ has a lone pair of electrons. Hence, acts as Lewis base. A coordinate bond is formed between the two.
H₃N: →BF₃ 

Conc. of a strong Acid with pH=5 is 10^-5 M. On diluting 100- times the concentration decreases to 10^-7.

But the water at 25 degree C will be having 10^–7 M of H3O+ ions in solution. So the H3O+ ion concentration in 10^-7 M HCl is (10^-7+10^-7) M

= 2 x 10^{^-7}.

So it pH= - log (2 x 10^-7)

= 6.6987

The boiling point of a liquid is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid. The boiling point of liquids varies with and depends upon the surrounding environmental pressure. 

The normal boiling of a liquid is the special case in which the vapor pressure of the liquid equals the defined atmospheric pressure at sea level i.e., at 1 atmosphere (atm) is 100^ºC.

• Sugar does not ionise in water but NaCl ionises completely in water and produces Na⁺ and Cl^– ions.

• Conductance increases with increase in concentration of salt due to release of more ions.

Given, pH of Ba(OH)₂ = 12
pOH = 14-pH
= 14-12 = 2
We know that,
pOH = -log [OH^-]
2 =-log [OH^-]
[OH^-] = antilog (-2)
[OH^-] = 1 x 10^-2

Ba(OH)₂dissolves in water as 

For 0.3 g of Ca(OH)₂ dissolved in water to give 500 mL of solution:

∆H_reaction = (∆H_Product - ∆H_reactant)
= (-635.1 - 393.5)-(-1206.9) = 178.3 kJ mol^-1
So, we can say that the reaction is endothermic in nature. 
So, an increase in temperature will drive the reaction in a forward direction. (According to Le Chetelier principle-a principle stating that if a constraint (such as a change in pressure, temperature, or concentration of a reactant) is applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the constraint.)

PαX_solute (Henrys Law)

Le Chaterlier principle is used.

According to Lewis concept, a positively charged or an electron deficient species acts as Lewis acid. BF₃ is an electron deficient compound with B having 6 electrons only.

Human blood, 7.38: pH = 7.38 = – log [H+]
∴ [H+] = 10^7.38

4.17 × 10^–8 M

When pressure is decreased , volume of reaction system will increase. So reaction will move in a direaction where there will be more number of moles. So reaction will move in forward direaction and moles of product will increase.

As P decreases solubility of gas also decreases (Henrys Law)​

Catalyst changes the course of reaction by decreasing low Ea energy pathway.

Dynamic nature can be studied by deuterium isotope.

The number of moles of reaction products will increase. According to Le Chatelier’s principle, if pressure is decreased, then the equilibrium shifts in the direction in which the number of moles of gases is more. In the given reaction, the number of moles of gaseous products is more than that of gaseous reactants. Thus, the reaction will proceed in the forward direction. As a result, the number of moles of reaction products will increase. 

vapour pressure at the given temperature is constant.​

H⁺ attacks on one lone pair of H₂O to form H₃O⁺ which is more stable than H⁺.

Higher the boiling point lower will be the vapour pressure. Thus, the correct order of vapour pressure is Water < Acetone < Ether.