31.

When AgNO₃ solution is added in excess to 1M solution of CoCl₃. X NH₃ one mole of AgCl is formed. What is the value of X?

• 1

• 4

• 3

• 2

In which of the following coordination compounds, the central metal ion is in zero oxidation state?

• [Fe(H₂O)₆]Cl₃

• K₄[Fe(CN)₆]

• Fe(CO)₅

• [Fe(H₂O)₆]Cl₂

The percentage of lanthanides and iron respectively in misch metal are

• 50, 50

• 75, 25

• 90, 10

• 95, 5

The polymer obtained with methylene bridges by condensation polymer is

• PVC

• buna-S

• polyacrylonitrile

• bakelite

The amino acid containing indole part is

• tryptophan

• tyrosine

• proline

• methionine

The drug used as post operative analgesic in medicine is

• L-dopa

• amoxycillin

• sulphapyridine

• morphine

C₂H₅OH + 4I₂ + 3Na₂CO₃ → X + HCOONa + 5NaI + 3CO₂ + 2H₂O

In the above reaction, 'X' is

• diodomethane

• triodomethane

• iodomethane

• tetrariodomethane

Phenol on oxidation in air gives

• quinone

• catechol

• resorcinol

• o-cresol

Identify the reagents A and B respectively in the following reaction.

CH₃COOH  CH₃COCl  CH₃CHO

• SOCl₂, H₂/ Pd-BaSO₄

• H₂/ Pd-BaSO₄, SOCl₂

• SOCl₂, H₂O₂

• SOCl₂, O₅O₄

Predict respectively 'X and 'Y' in the following reactions.

Ar-NH₂ $\stackrel{\mathrm{X}}{\to }$ Ar-$\stackrel{+}{\mathrm{N}}$≡N

$\overline{\mathrm{Cl}} \stackrel{\mathrm{Y}}{\to } \mathrm{Ar}-\mathrm{Cl}$

• NaNO₃ and Cl₂

• NaNO₃ - HCl and HCl

• NaNO₂ - HCl and Cu/ HCl

• NaNO₂ - HCl and NaNH₂