The correct discending order of oxidising power of the following is

• ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-} > {\mathrm{MnO}}_4^{-} > {\mathrm{VO}}_2^{+}$

• ${\mathrm{MnO}}_4^{-} > {\mathrm{Cr}}_2{\mathrm{O}}_7^{2-} > {\mathrm{VO}}_2^{+}$

• ${\mathrm{VO}}_2^{+} > {\mathrm{MnO}}_4^{-} > {\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$

• ${\mathrm{MnO}}_4^{-} > {\mathrm{VO}}_2^{+} > {\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$

The number of electrons that are involved in the reduction of permanganate to manganese (II) salt, manganate and manganese dioxide respectively are

• 5, 1, 3

• 5, 3, 1

• 2, 7, 1

• 5, 2, 3

The calculated magnetic moment of a divalent ion of an atom with atomic number 24 in aqueus solution is

• 4.90 BM

• 5.92 BM

• 3.87 BM

• 2.84 BM

The entropy of vaporisation of a liquid is 58 JK^-1 mol^-1. If 100 g of its vapour condenses at its boiling point of 123° C, the value of entropy change for the process is

• -100 JK^-1

• 100 JK^-1

• -123 JK^-1

• 123 JK^-1

The values of limiting ionic conductance of H⁺ and HCOO^- ions are respectively 347 and 53S cm² mol^-1, the dissociation constant of methanoic acid at 298 K is

• 2.5 × 10^-4

• 2 × 10^-5

• 2.5 × 10^-5

• 1.5 × 10^-4

In a closed cylinder of capacity 24.6 L, the following reaction occurs at 27°C.

A₂ (s) $\rightleftharpoons$ B₂ (s) + 2C (g)

At equilibrium, 1 gm of B₂ (s) (molar mass = 50 g mol^-1) is present. The equilibrium constant K_p for the equilibrium in atm² unit is 

(R = 0.082 L atm K^-1 mol^-1)

• 1.6 × 10^-2

• 1.6 × 10^-5

• 1.6 × 10^-3

• 1.6 × 10^-4

The pH of a saturated solution of a metal hydroxide of formula X(OH)₂ is 12.0 at 298 K. What is the solubility product of a metal hydroxide at 298 K (in mol³ L^-3)?

• 5 × 10^-7

• 2 × 10^-6

• 1 × 10^-7

• 5 × 10^-5

The IUPAC name of the complex [Co(NH₃)₂(H₂O)₄]Cl₃ is

• diaminetetraaquacobalt (III) trichlodde

• diaminetetraaquacobalt (II) chloride

• diaminetetraaquacobalt (III) chloride

• tetraaquadiaminecobalt (III) trichloride

The products obtained by the ozonolysis of 2-ethylbut-1-ene are

• propanone and ethanal

• methanal and 3-pentanone

• ethanal and 3-pentanone

• butanal and ethanal

20.

When but-2-yne is treated with Na in liquid ammonia

• cis-2-butene is obtained

• trans-2-butene is formed

• n-butane is the major product

• it rearranges to but-1-yne