How many ions per molecule are produced in the solution, when Mohr salt is dissolved in excess of water?

• 4

• 5

• 6

• 10

Which of the following aqueous solution has the highest freezing point?

• 0.1M surcose

• 0.01 M NaCl

• 0.1 M NaCl

• 0.01 M Na₂SO₄

Half-life period of a first order reaction is 10 min. Starting with initial concentration 12 M, the rate after 20 min is

• 0.0693 M min^-1

• 0.693 × 3M min^-1

• 0.0693  × 3M min^-1

•  0.0493 × 4M min^-1

34.

The salt which responds to dilute and concentrated H₂SO₄ is

• CaF₂

• Ba(NO₃)₂

• Na₂SO₄

• Na₃PO₄

The aqueous solution of following salt will have the lowest pH

• NaClO₃

• NaClO

• NaClO₂

• NaClO₄

For one of the element various successive ionisation enthalpies (in kJ mol^-1) are given below.

The element is

• Si

• P

• Al

• Mg

How many Coulombs of electricity are required for the oxidation of one mole of water to dioxygen?

• 9.65 × 10⁴ C

• 1.93 × 10⁴ C

• 1.93 × 10⁵ C

• 19.3 × 10⁵ C

Which of the following colloids cannot be easily coagulated?

• Lyophobic colloids

• Multimolecular colloids

• Macromolecular colloids

• Irreversible colloids

The complex ion having minimum magnitude of Δ_° (CFSE) is

• [Cr(CN)₆]^3-

• [Co(CN₃)₆]³⁺

• [Co(Cl)₆]³⁺

• [Cr(H₂O)₆]³⁺

Cryolite is

• Na₃AlF₆ and is used in the electrolysis of alumina for decreasing electrical conductivity

• Na₃AlF₆ and is used in the electrolysis of alumina for lowering the melting point of alumina only ·

• Na₃AlF₆ and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina

• Na₃AlF₆ and is used in the electrolytic refining of alumina