41.

If the positions of Na⁺ and Cl^- are interchanged in NaCl , the crystal lattice with respect to Na⁺ and CI^- is:

• bcc and fcc

• fcc and bcc

• both fcc

• both bcc

At a temperature, vapour pressure of pure benzene is 640 mm Hg. On dissolving 2.175 g of a non-volatile solid solute in 39.0 g benzene, vapour pressure of the solution if found to be 600 mm Hg. The molecular mass of solute is:

• 65.25

• 54.94

• 63.55

• 87.62

50 cm³ ethylene glycol is dissolved in 50 g water. Freezing point of solution is -34°C. Assuming ideal behaviour than density of ethylene glycol is (for water , K_f =1.86 K kg mol^-1)

• 1.273 g/cm³

• 2.173 g/cm³

• 1.133 g /cm³

• 2.612 g/cm³

For the same transition metal ion, the colour of its compounds will depend upon:

• temperature of the reaction

• pressure of the reaction

• nature of ligands or Lewis bases attached to the metal ion

• concentration of the ligands

Arsenic sulphide sol is prepared by passing H₂S through arsenic oxide solution. The charge developed on the particles is due to adsorption of :

• H⁺

• S^2-

• OH^-

• O^2-

The average molar heat capacity at constant volume of gaseous mixture contained 2 moles of each of two ideal gases X (C_V , m = $\frac{3}{2}$R) and Y (C_V , m = $\frac{5}{2}$R)

• 2R

• 3R

• 4R

• 8R

Liquid flow from a higher to a lower level.Which of the following liquids can climb up the walls of the glass vessel in which it is placed?

• Mercury

• Liquid N₂

• Liquid He (II)

• Water

A greenish yellow gas reacts with alkali metal hydroxide to form a halate which can be used in fire works and safety matches. The gas and halate respectively are :

• B₂ , KBrO₃

• Cl₂ , KClO₃

• I₂ , NaIO₃

• Cl₂ , NaClO₃

Aniline when diazotised in cold and then treated with dimethyl aniline gives a coloured product. The structure of coloured product would be:

What happens if CCl₄ is treated with AgNO₃ ?

• A white ppt. of AgCl will form

• NO₂ will be evolved

• CCl₄ will dissolve in AgNO₃

• Nothing will happen