Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by CN^- ion towards metal species is

• a, b

• a, b, c

• c, a

• c, a

372.

The coordination number of central metal atom in a complex is determined by

• The number of ligands around a metal ion bonded by sigma bonds

• The number of only anionic ligands bonded to the metal ion

• The number of ligands around a metal ion bonded by sigma and pi- bonds both

• The number of ligands around a metal ion bonded by sigma and pi- bonds both

Which one of the following complexes in an outer orbital complex?

• [Fe(CN)6]4-

• [Ni(NH₃)₆]²⁺

• [Co(NH₃)₆]³⁺

• [Co(NH₃)₆]³⁺

Coordination compound has great importance in biological systems. In this context which of the following statements is incorrect?

• Chlorophylls are green pigments in plants and contain calcium

• Carboxypeptidase – A is an enzyme and contains zinc

• Cyanocobalamin is B₁₂ and contains cobalt

• Cyanocobalamin is B₁₂ and contains cobalt

Which one the following has the largest number of isomers?

• [Ru(NH₃)₄Cl²⁺]

• [Co(en)₂Cl₂]⁺

• [Ir(PR₃)₂H(CO)]²⁺

• [Ir(PR₃)₂H(CO)]²⁺

The correct order of magnetic moments (spin only values in B.M.) among is

(Atomic numbers: Mn = 25; Fe = 26, Co =27)

• [MnCl₄]^2- > [CoCl₄]^-2 > [Fe(CN)₆]^-4

• [Fe(CN)₆]^-4 > [CoCl₄]^2- > [MnCl₄]^2-

• [Fe(CN)₆]^4- > [MnCl₄]^2- > [CoCl₄]^2-

• [Fe(CN)₆]^4- > [MnCl₄]^2- > [CoCl₄]^2-

Amongst the following compound, the optically active alkane having lowest molecular mass

Which of the following compound is not chiral?

• 1- chloropentane

• 3-chloro-2- methyl pentane

• 1-chloro -2- methyl pentane

• 1-chloro -2- methyl pentane

Consider the following reaction and statements:

$\left[Co\right(N{H}_3{)}_{4}B{r}_2{]}^{+} + B{r}^{-} \stackrel{ }{\to } \left[Co\right(N{H}_3{)}_{3}B{r}_3] + N{H}_3$

(I) Two isomers are produced if the reactant complex ion is a cis-isomer
(II) Two isomers are produced if the reactant complex ion is a trans-isomer
(III) Only one isomer is produced if the reactant complex ion is a trans-isomer
(IV) Only one isomer is produced if the reactant complex ion is a cis – isomer

The correct statements are

• (II) and (IV)

• (I) and (II)

• (I) and (III)

• (III) and (IV)

The trans-alkenes are formed by the reduction of alkynes with

• Sn - HCl

• H₂ – Pd/C, BaSO₄

• NaBH₄

• Na/liq. NH₃