Which of the following order of basic strength is correct?

• NH₃ < NH₂OH < HN₃ < NH₂-NH₂

• NH₂OH <HN₃ <NH₂-NH₂ <NH₃

• HN₃ <NH₃ <NH₂OH <NH₂-NH₂

• HN₃ <NH₂OH <NH₂-NH₂<NH₃

A packet of colloidal system is taken in which colloidal particles are still. Two electrodes are taken in system and voltage is applied so that liquid medium moves under the influence of electric field. This phenomenon is called

• electrodialysis

• electroosmosis

• electrophoresis

• None of these.

Which one forms KHX₂ type compound?

• HF

• HCl

• HI

• HBr

Which of the following is stable (inert) to fire?

• CCl₄

• C₂H₅OH

• CH₄

• C₄H₁₀

The composition of carnalite is

• $\mathrm{KCl}·{\mathrm{MgCl}}_2·6{\mathrm{H}}_2\mathrm{O}$

• Na₂Al₂O₃

• Fe₃O₄

• Na₃AlF₆

A spoon to be electroplated with gold should be

• cathode

• anode

• electrolyte

• none of these.

47.

A solid AB has NaCl type structure. The radius of A⁺is 100 pm. What is the radius of B^-?

• 190.47

• 540.13

• 525

• 78.12

Correct equation of Freundrich isotherm is

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right)= \log \mathrm{K} + \frac{1}{\mathrm{n}} \log \mathrm{C}$

• $\log \left(\frac{\mathrm{m}}{\mathrm{x}}\right)= \log \mathrm{K} +\frac{1}{\mathrm{n}} \log \mathrm{C}$

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right) = \log \mathrm{C} + \frac{1}{\mathrm{K}}\log \mathrm{C}$

• $\log \left(\frac{\mathrm{x}}{\mathrm{m}}\right)= \log \mathrm{C}+\frac{1}{\mathrm{n}}\log \mathrm{K}$

Crystalline solids have

• short range order

• long range order

• anisotropic distribution

• All of these.

How many electrons are de! ivered at the cathode during electrolysis by a current of 1 A in 60 seconds?

• 3.74 x 10²⁰

• 6.0 x 10²³

• 7.48 x 10²¹

• 6.0 x 10²⁰