For synthesis of 1-butene, CH3MgI should be treated with

• propene

• 2-chloropropene

• allyl chloride

• ethyl chloride

Corrosive sublimate (HgCl₂) can be used distinguish between

• formic acid and acetic acid

• acetaldehyde and butanone

• formaldehyde and propanone

• All of the above

Which of the following does not contain silicon?

• Kaoline

• Agate

• Ruby

• Quartz

24.

The amount of silver deposited on passing 2 F of electricity through aqueous solution of AgNO₃

• 54g

• 108g

• 216g

• 324g

EMF of hydrogen electrode in term of pH is (at 1 atm pressure).

• ${\mathrm{E}}_{{\mathrm{H}}_2}=\frac{\mathrm{RT}}{\mathrm{F}}\times \mathrm{pH}$

• ${\mathrm{E}}_{{\mathrm{H}}_2}=\frac{\mathrm{RT}}{\mathrm{F}}·\frac{1}{\mathrm{pH}}$

• ${\mathrm{E}}_{{\mathrm{H}}_2}=\frac{2.303 \mathrm{RT}}{\mathrm{F}}\mathrm{pH}$

• ${\mathrm{E}}_{{\mathrm{H}}_2}=- 0.591 \mathrm{pH}$

Peptization denotes

• digestion of food

• hydrolysis of proteins

• breaking and dispersion into colloidal state

• precipitation of solid from colloidal dispersion

Blue colour of water in sea is due to

• refraction of blue light by impurities

• refraction blue sky by water

• scattering of light by water

• None of the above

Freundlich adsorption isotherm is

• $\frac{\mathrm{x}}{\mathrm{m}}={\mathrm{kp}}^{1/\mathrm{n}}$

• $\mathrm{x}={\mathrm{mkp}}^{1/\mathrm{n}}$

• $\frac{\mathrm{x}}{\mathrm{m}}={\mathrm{kp}}^{-\mathrm{n}}$

• All of these

A certain nuclide has a half-life period of 30 min. If a sample containing 600 atoms is allowed to decay for 90 min, how many atoms will remain ?

• 200 atoms

• 450 atoms

• 75 atoms

• 150 atoms

Which of the following is an amphoteric oxide?

• SO₃

• Mg

• Al₂O₃

• P₄O₁₀