ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Chemistry (Theory)

Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?

Define the following term: Primitive unit cells

What type of battery is mercury cell? Why is it more advantageous than dry cell?

How will you distinguish between the following pairs of terms : Crystal lattice and unit cell

Name the type of cell which was used in Apollo space programme for providing electrical power.

Define terms: Fuel cell

Define the following terms: Secondary batteries

Match the following

The solubility of silver chloride _______ in the presence of sodium: chloride because of ___________

In the complexes `[Fe(CN)_6]^(3-)` and `[pt(en) (H_2O)_2(NO_2 (Cl)^(2+)]``the respective oxidation numbers of central metal atoms are

1) +3 and +4

2) +6 and + 4

3) +6 and +3

4) +3 and + 3

What is the effect of temperature on the ionic, product of water? How will it change the pH value of a neutral solution?

Two liquids A and B form type II non-ideal solution which shows a minimum in its temperature -mole fraction plot (T -x diagram). Can the two liquids be completely separated by fractional distillation?

The aqueous solution of sodium acetate is basic. Explain.

What is the difference between the order of a reaction and the molecularity of a reaction?

Calculate the concentration of OH^- ions in solution when [H⁺] = 6.2 x 10^-2L mol L^-1.

State the Le Chatelier's principle.

For a crystal of sodium chloride, state:

1) The type of lattice in which it crystallises

2) The coordina~ion number of each sodium ion and chloride ion in the crystal lattice.

3) The number of sodium ions and chloride ions present in a unit cell of sodium chloride.

4) The structural arrangement of the sodium chloride crystaL

When NH₄ Cl and NH₄OH are added to a solution containing both, Fe³⁺ and Ca²⁺ ions, which ion is precipitated first and why?

Write the IUPAC names of the following coordination compounds: 

[Cr(NH₃)₄(H₂O)₂]Cl₃

Write the IUPAC names of the following coordination compounds:

`[PtCl_2(NH_3)_4][PtCl_4]`