Multiple Choice QuestionsWhich one of the following molecules is expected to exhibit diamagnetic behaviour?
C2
O2
N2
N2
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.
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]
A.
[Co(NH3)6]Cl3
CoCl. 6NH3 + AgNO3 → AgCl
2.675/2667.5 excess 4.78/143.5
= 0.01 mole = 0.03310 mole
because 0.01 mole CoCl3.6NH3 given 0.0331 mole AgCl.
hence 1 mole of CoCl3.6NH3 will given 0.03310/0.010 =3 mole.
Thus the formula of the compound will be [Co(NH3)6]Cl3
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
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