﻿ The bond order in O2- ion is from Chemistry NEET Year 2008

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# 11.The bond order in O${}_{2}^{-}$ ion is2 1 2.5 1.5

D.

1.5

The molecular configuration of O${}_{2}^{-}$ is as σ1s2, σ*1s2, σ2s2, σ*2s2, σ2p${}_{\mathrm{z}}^{1}$$\mathrm{\pi }$2p${}_{\mathrm{y}}^{2}$≈ $\mathrm{\pi }$2p${}_{\mathrm{z}}^{2}$$\mathrm{\pi }$*2p${}_{\mathrm{y}}^{2}$ ≈ $\mathrm{\pi }$*2p${}_{\mathrm{z}}^{1}$

Bond order =

=  = 1.5

12.

The rms velocity of an ideal gas at constant pressure varies with density (d) as

• $\frac{1}{\sqrt{\mathrm{d}}}$

• d

• $\sqrt{\mathrm{d}}$

• d2

13.

For which reaction change of entropy will be positive?

• H2(g) + I2(g) $⇌$ 2HI (g)

• HCl (g) + NH3 (g) $⇌$ NH4Cl (s)

• NH4NO3 (s) $⇌$ N2O (g) + 2H2O (g)

• MgO(s) + H2(g) $⇌$ Mg(s) + H2O(l)

14.

The product p of the nuclear reaction

, is

• ${}_{56}{}^{141}\mathrm{Sr}$

• ${}_{56}{}^{141}\mathrm{La}$

• ${}_{56}{}^{141}\mathrm{Ba}$

• ${}_{56}{}^{141}\mathrm{Cs}$

15.

Which of the following acids has the smallest dissociation constant?

• CH3CHFCOOH

• FCH2CH2COOH

• BrCH2CH2COOH

• CH3CHBrCOOH

16.

Which one of the following processes is used for the manufacture of calcium?

• Reduction of CaO with carbon

• Reduction of CaO with hydrogen

• Electrolysis of a mixture of anhydrous CaCl2 and KCl

• Electrolysis of molten Ca(OH)2

17.

Fe(OH)3 can be separated from Al(OH)3 by the addition of

• NaCl solution

• dil. HCl solution

• NaOH solution

• NH4Cl and NH4OH

18.

Select the incorrect statement among the following:

• O3 is used as germicide for purification of air

• In O3, O-O bond length is identical with that of molecular oxygen

• O3 molecule is angular in shape.

• O3 is an oxidising agent

19.

The brown complex obtained in the detection of nitrate radical is formulated as [Fe(H2O)5NO]SO4. What is the oxidation number of Fe in this complex?

• +1

• +2

• +3

• 0

20.

1 mole of methyl amine on reaction with nitrous acid gives at NTP

• 1.0 L of nitrogen

• 22.4 L of nitrogen

• 11.2 L of nitrogen

• 5.6 L of nitrogen