During the adsorption of krypton on activated charcoal at low temperature

• $∆$H < 0 and $∆$S < 0

• $∆$H > 0 and $∆$S < 0

• $∆$H > 0 and $∆$S > 0

• $∆$H < 0 and $∆$S > 0

1 g of silver gets distributed between 10 cm³ of molten zinc and 100 cm³ of molten lead at 800°C. The percentage of silver still left in the lead layer is approximately

• 2

• 5

• 3

• 1

In Ramsay and Rayleigh's isolation of noble gases from air, the nitrogen of the air is finally converted into

• NaNO₂ only

• NO and NO₂

• NaNO₃ only

• NaNO₂ and NaNO₃

The IUPAC name of the complex [Co(NH₃)₄Cl₂]Cl is

• dichloro tetraammine cobalt (III) chloride

• tetraammine dichloro cobalt (III) chloride

• tetraammine dichloro cobalt (II) chloride

• tetraammine dichloro cobalt (IV) chloride

The time required for 100% completion of a zero order reaction is

• ak

• $\frac{\mathrm{a}}{2\mathrm{k}}$

• $\frac{\mathrm{a}}{\mathrm{k}}$

• $\frac{2\mathrm{k}}{\mathrm{a}}$

E₁, E₂ and E₃ are the emfs of the following three galvanic cells respectively.

(i) Zn (s) | Zn²⁺ (0.1 M) || Cu²⁺ (1M) | Cu (s)

(ii) Zn (s) | Zn²⁺ (1 M) || Cu²⁺ (1M) | Cu (s)

(iii) Zn (s) | Zn²⁺ (1 M) || Cu²⁺ (0.1M) | Cu (s)

Which one of the following is true?

• E₂ > E₁ > E₃

• E₁ > E₂ > E₃

• E₃ > E₁ > E₂

• E₃ > E₂ > E₁

47.

The standard emf of a galvanic cell involving 2 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the redox reaction of the cell is

• 10²⁰

• 10⁵

• 10

• 10¹⁰

9.65 C of electric current is passed through fused alyhdrous MgCl₂. The magnesium metal thus obtained is completely converted into a Grignard reagent. The number of moles of Grignard reagent obtained is

• 5 × 10^-4

• 1 × 10^-4

• 5 × 10^-5

• 1 × 10^-5

Which one of the following does not involve coagulation?

• Clotting of blood by the use of ferric chloride

• Formation of delta region

• Treatment of drinking water by potash alum

• Peptization

Asolution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows

• negative deviation from Raoult's law

• positive deviation from Raoult's law

• no deviation from Raoult's law

• positive or negative deviation from Raoult's law depending upon the composition