Which of the following metal ions has a calculated magnetic moment value of ✓24. BM?

• Mn²⁺

• Fe²⁺

• Fe³⁺

• Co²⁺

Xenon reacts with fluorine at 873 Kand 7 bar to form XeF₄. It his reaction, the ratio of xenon and fluorine required is

• 1:5

• 10:1

• 1:3

• 5:1

The packing efficiency of simple cubic (sc), body centred cubic (bcc) and cubic close packing (ccp) lattices follow the order

• bcc <ccp <sc

• ccp <bcc <sc

• sc <ccp <bcc

• sc <bcc <ccp

The experimental depression in freezing point of a dilute solution is 0.025 K. If the van't Hoff factor (i) is 2.0, the calculated depression in freezing point (in K) is

• 0.00125

• 0.025

• 0.0125

• 0.05

The molality of an aqueous dilute solution containing non-volatile solute is 0.1 m. What is the boiling temperature (in °C) of solution? (Boiling point elevation constant, K_b = 0.52 kg mol^-1K; boiling temperature of water = 100°C).

• 100.0052

• 100.052

• 100.0

• 100.52

26.

Which one of the following is correct plot of Λ_m ( in S cm² mol^-1) and √C (in mol/L^1/2) for KCl solution? ( y= Λ_m; x= √C)

• 

• 

• 

• 

For the reaction $5{\mathrm{Br}}^{-}\left(\mathrm{aq}\right) + 6{\mathrm{H}}^{+}\left(\mathrm{aq}\right) + {\mathrm{BrO}}_3^{-} \to 3{\mathrm{Br}}_2\left(\mathrm{aq}\right) + 3{\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right) \mathrm{if}, -\frac{∆\left[{\mathrm{BrO}}_3^{-}\right]}{∆\mathrm{t}}= 0.01 \mathrm{mol} {\mathrm{L}}^{-1}{\min }^{-1}, \frac{∆\left[{\mathrm{Br}}_2\right]}{∆\mathrm{t}}\mathrm{in} \mathrm{mol} {\mathrm{L}}^{-1}{\min }^{-1}\mathrm{is}$

• 0.01

• 0.3

• 0.03

• 0.005

Which one of the following is an emulsion?

• Milk

• Soap lather

• Butter

• Vanishing cream

Copper matte contains .....

• Cu₂O, Cu₂S

• Cu₂O, FeO

• Cu₂S, FeS

• Cu₂S, FeO

X reacts with dilute nitric acid to form 'laughing gas'. What is X ?

• Cu

• P₄

• S₈

• Zn