Which one of the following molecules is expected to exhibit diamagnetic behaviour?

• C₂

• O₂

• N₂

• N₂

12.

Which among the following will be named as dibromidobis(ethylene diamine)chromium(III) bromide?

• [Cr(en)₃]Br₃

• [Cr(en)₂Br₂]Br

• [Cr(en)Br₄]^-

• [Cr(en)Br₄]^-

Which one of the following statements is correct?

• All amino acids except lysine are optically active

• All amino acids are optically active

• All amino acids except glycine are optically active

• All amino acids except glycine are optically active

How many chiral compounds are possible on monochlorination of 2–methyl butane?

• 8

• 2

• 4

• 4

Which of the following facts about the complex [Cr(NH₃)₆]Cl₃ is wrong?

• The complex involves d²sp³ hybridisation and is octahedral in shape.

• The complex is paramagnetic. 

• The complex is an outer orbital complex. 

• The complex is an outer orbital complex. 

The magnetic moment (spin only) of [NiCl₄]^2- is:

• 1.82 BM

• 5.46 BM 

• 2.82 BM

• 2.82 BM

A solution containing 2.675 of CoCl₃. 6NH₃(molar mass = 267.5 g mol^–1) is passed through a cation exchanger. The chloride ions obtained is solution was treated with excess of AgNO₃ to give 4.78 g of AgCl (molar mass = 143.5 g mol^–1 ). The formula of the complex is
(At. mass of Ag = 108 u)

• [Co(NH₃)₆]Cl₃

• [CoCl₂(NH₃)₄]Cl

• [CoCl₃(NH₃)₃]

• [CoCl₃(NH₃)₃]

Which one of the following has an optical isomer?

• [Zn(en)(NH₃)₂]²⁺

• [Co(H₂O)₄(en)]³⁺

• [Co(en)₃]³⁺

• [Co(en)₃]³⁺

Out of the following, the alkene that exhibits optical isomerism is

• 2–methyl–2–pentene

• 3–methyl–2–pentene

• 4–methyl–1–pentene

• 4–methyl–1–pentene

Which of the following species is not paramagnetic

• NO

• CO

• O₂

• O₂