31.

For decolourization of 1 mole of KMnO₄, the moles of H₂O₂ required is

• 1/2

• 3/2

• 5/2

• 7/2

Which of the following does not have optical isomer?

• [Co(NH₃)₃Cl₃]

• [Co(en)₃]Cl₃

• [Co(en)₂Cl₂]Cl

• [Co(en)(NH₃)₂Cl₂]Cl

For electron affinity of halogens which of the following is correct?

• Br > F

• F > Cl

• Br > Cl

• F > I

Which of the following is arranged in the increasing order of enthalpy of vaporization?

• NH₃, PH₃, AsH₃

• AsH₃, PH_3, NH₃

• NH₃, AsH₃, PH₃

• PH₃, AsH_3, NH₃

The average osmotic pressure of human blood is 7.8 bar at 37°C. What is the concentration of an aqueous NaCl solution that could be used in the blood stream?

• 0.16 mol/L

• 0.32 mol/L

• 0.60 mol/L

• 0.45 mol/L

The crystal system of a compound with unit cell dimensions a= 0.387 nm, b= 0.387 nm and c = 0.504 nm and $\mathrm{\alpha }-\mathrm{\beta }-$90° and $\mathrm{\gamma }-$ 120° is

• Cubic

• Hexagonal

• Orthorhombic

• Rhombohedral

Which of the following statements is true for the electrochemical Daniell cell?

• Electrons flow from copper electrode to zinc electrode.

• Current flows from zinc electrode to copper electrode.

• Cations move toward copper electrode.

• Cations move toward zinc electrode.

The rate constant k, for the reaction 

${\mathrm{N}}_2{\mathrm{O}}_{5\left(\mathrm{g}\right)} \to 2{\mathrm{NO}}_{2\left(\mathrm{g}\right)} +\frac{1}{2}{\mathrm{O}}_{2\left(\mathrm{g}\right)}$ is 2.3 x 10^-2s^-1. Which equation given below describes the change of [N₂O₅] with time? [N₂O₅]₀ and [N₂O₅]_t correspond to concentration of N₂O₅ initially and at time t.

• [N₂O₅]_t =[N₂O₅]₀ +kt

• [N₂O₅]_t = [N₂O₅]₀e^kt

• log[N₂O₅]_t = log[N₂O₅]₀ +kt

• $\ln \frac{[{\mathrm{N}}_2{\mathrm{O}}_5{]}_0}{[{\mathrm{N}}_2{\mathrm{O}}_5{]}_{\mathrm{t}}}= \mathrm{kt}$

Assertion: HClO₄ is a stronger acid than HClO₃.

Reason : Oxidation state of Cl in HClO₄ is +8 and in HClO₃ +5.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : The [Ni(en)₃]Cl₂ (en = ethylene diamine) has lower stability than [Ni(NH₃)₆]Cl₅.

Reason : In [Ni(en)₃]Cl₂ the geometry of Ni is trigonal bipyramidal.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.