Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

When acidulated water (dil.H₂SO₄ solution) is electrolysed, will the pH of the solution be affected? Justify your answer.

Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?

Why on dilution the m Λ_m of \[\ce{CH3COOH}\] increases very fast, while that of \[\ce{CH3COONa}\] increases gradually?

Match the items of Column I and Column II on the basis of data given below:

`E_("F"_2//"F"^-)^Θ` = 2.87 V, `"E"_(("Li"^(+))//("Li"^-))^Θ` = − 3.5V, `"E"_(("Au"^(3+))//("Au"))^Θ` = 1.4 V, `"E"_(("Br"_(2))//("Br"^-))^Θ` = 1.09 V

Assertion: Λ_m for weak electrolytes shows a sharp increase when the electrolytic solution is diluted.

Reason: For weak electrolytes degree of dissociation increases with dilution of solution.

Assertion: `"E"_("Ag"^+ //"Ag")` increases with increase in concentration of Ag⁺ ions.

Reason: `"E"_("Ag"^+ //"Ag")` has a positive value.

Assertion: Copper sulphate can be stored in zinc vessel.

Reason: Zinc is less reactive than copper.

Consider figure and answer the question to given below.

How will the concentration of Zn²⁺ ions and Ag⁺ ions be affected after the cell becomes ‘dead’?

Which of the following statements is incorrect about the collison theory of chemical reaction?

Which of the following statements are applicable to a balanced chemical equation of an elementary reaction?

(i) Order is same as molecularity.

(ii) Order is less than the molecularity.

(iii) Order is greater than the molecularity.

(iv) Molecularity can never be zero.

For a reaction A + B `->` Products, the rate law is — Rate = k [A][B]^3/2 Can the reaction be an elementary reaction? Explain.

Assertion: All collision of reactant molecules lead to product formation.

Reason: Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

All energetically effective collisions do not result in a chemical change. Explain with the help of an example.

What should be the considerations during the extraction of metals by electrochemical method?

Which of the following acids forms three series of salts?

Phosphorus forms a number of oxoacids. Out of these oxoacids phosphinic acid has strong reducing property. Write its structure and also write a reaction showing its reducing behaviour.

Which of the following statements are correct about the reaction intermediate?

(i) Intermediate (c) is unstable because in this carbon is attached to 5 atoms.

(ii) Intermediate (c) is unstable because carbon atom is sp² hybridised.

(iii) Intermediate (c) is stable because carbon atom is sp² hybridised.

(iv) Intermediate (c) is less stable than the reactant (b).

Draw other resonance structures related to the following structure and find out whether the functional group present in the molecule is ortho, para directing or meta directing.

Why is it necessary to avoid even traces of moisture during the use of a Grignard reagent?

The process of converting alkyl halides into alcohols involves ______.