The correct order of increasing [H₃O+] in the following aqueous solutions is

• 0.01 M H₂S < 0.01 M H₂SO₄ < 0.01M NaCl< 0.01 M NaNO₂

• 0.01 M NaCl<0.01 M NaNO₂ <0.01 M H₂S <0.01 M H₂SO₄

• 0.01 M NaNO₂ < 0.01 M NaCl < 0.01 M H₂S <0.01 M H₂SO₄

• 0.01 M H₂S < 0.01 M NaNO₂ < 0.01 M NaCl <0.01M H₂SO₄

During titration of acetic acid with aqueous NaOH solution, the neutralisation graph has a vertical line. This line indicates

• alkaline nature of equivalence

• acidic nature of equivalence

• neutral nature of equivalence

• depends on experimental proceeding

The standard molar heat of formation of ethane ,CO₂ and water are respectively - 21.1 , - 94.1 and - 68. 3 kcal .The standard molar heat of combustion of ethane will be :

• - 372 kcal

• 162 kcal

• - 240 kcal

• 183.5 kcal

Assertion : According to Le-Chatelier's principle addition of heat to an equilibrium solid $\rightleftharpoons$liquid results in decrease in the amount of solid.

Reason : Reaction is endothermic, so on heating forward reaction is favoured.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Copper metal gets readily corroded in acidic aqueous solution.

Reason : Free energy change for this process is negative.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : The equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature.

Reason : The composition of the final equilibrium mixture at a particular temperature depends upon the starting amount of reactants.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Hydrolysis of sodium acetate gives :

• acidic solution

• basic solution

• amphoteric solution

• neutral solution

Cationic hydrolysis gives the following solution :

• acidic

• basic

• neutral

• amphoteric

629.

Number of moles of K₂Cr₂O₇ reduced by one mole of Sn²⁺: 

• $\frac{1}{3}$

• 3

• $\frac{1}{6}$

• 6

Suitable condition for melting of ice :

• high temp. and high pressure

• high temp. and low pressure

• low temp. and low pressure

• low temp. high pressure