A cell, with cell constant 0.4 cm^-1, has the resistance of 40 ohm of a 0.01 M solution of an electrolyte, then the molar conductivity in ohm^-1 cm² mol^-1 will be

• 10⁴

• 10³

• 10²

• 1

If the standard elelctrode potential for the cell Zn | Zn²⁺ (aq) || Cu²⁺ (aq) | Cu is 1.10 V, then the maximum work done by this cell will be

• -106.15 kJ

• -212.30 kJ

• -318.45 kJ

• -424.60 kJ

3A → 2B, rate of reaction $\frac{+\mathrm{d} \left(\mathrm{B}\right)}{\mathrm{dt}}$ is equal to

• $\frac{-3}{2}\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}$

• $-\frac{2}{3}\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}$

• $-\frac{1}{3}\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}$

• $+2\frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}$

2A → B + C

It would be a zero order reaction when

• the rate of reaction is proportional to square of concentration of A

• the rate of reaction remains same at any concentration of A

• the rate remains unchanged at any concentration of B and C

• the rate of reaction doubles if concentration of B is increased to double

The reaction A → B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 h. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

• 1 h

• 0.5 h

• 0.25 h

• 2 h

Chlorine cannot displace

• fluorine from NaF

• iodine from NaI

• bromine from NaBr

• None of the above

The structure of ionic compound with Schottky defects has

• same number of cationic and anionic vacancies

• anionic vacancy and interstitial anion

• cationic vacancies

• cationic vacancies and interstitial cation

If a pentavalent impurity is mixed in the crystal-lattice of germanium then the semiconductor formed will be

• p-type semiconductor

• n-type semiconductor

• (a) and (b) both

• None of the above

A compound formed by elements X and Y crystallises in a cubic structure in which the X atoms are at the comers of a cube and the Y atoms are at the face centres. The formula of the compound is

• XY₃

• X₃Y

• XY

• XY₂

60.

In a face centred cubic lattice, a unit cell is shared equally by how many unit cells?

• 4

• 2

• 6

• 8