A coordinate complex contains Co³⁺, Cl^- and NH₃. When dissolved in water, one mole of this complex gave a total of 3 moles of ions. The complex is

• [Co(NH₃)₆]Cl₃

• [Co(NH₃)₅Cl]Cl₂

• [Co(NH₃)₄Cl₂]Cl

• [Co(NH₃)₃Cl₃]

The product(s) formed when H₂O₂ reacts with disodium hydrogen phosphate is

• P₂O₅.Na₃PO₄

• Na₂HPO₄.H₂O₂

• NaH₂PO₄, H₂O

• Na₂HPO₄.H₂O

Which one of the following is used in the preparation of cellulose nitrate ?

• KNO₃

• HNO₃

• KNO₂

• HNO₂

The oxoacid of sulphur which contains two sulphur atoms in different oxidation states is

• pyrosulphurous acid

• hyposulphurous acid

• pyrosulphuric acid

• persulphuric acid

Benzene 4-hydroxy acetanilide belongs to which of the following?

• Antipyretic

• Antacid

• Antiseptic

• Antihistamine

The site of action of insulin is

• mitochondria

• nucleus

• plasma membrane

• DNA

The monomer of neoprene is

• 1,3-butadiene

• 2-chloro-1,3-butadiene

• 2-methyl-1,3-butadiene

• vinyl chloride

38.

What is the product obtained in the reaction of acetaldehyde with semicarbazide ?

• ${\mathrm{H}}_3\mathrm{C}-\mathrm{CH}=\mathrm{N}-{\mathrm{NHCONH}}_2$

• ${\mathrm{H}}_3\mathrm{C}-\mathrm{CH}=\mathrm{N}-{\mathrm{NH}}_2$

• ${\mathrm{H}}_3\mathrm{C}-\mathrm{CH}=\mathrm{N}-\mathrm{OH}$

• ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CCH}}_3=\mathrm{N}-\mathrm{NH}-\mathrm{CO}-{\mathrm{NH}}_2$

Compound A (C₃H₆O) undergoes following reactions to form B and C. Identify A, B and C.

   $\mathrm{C}\stackrel{\mathrm{Zn}-\mathrm{Hg}/\mathrm{HCl}}{\leftarrow } \underset{\mathrm{A}}{{\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O} }\stackrel{{\mathrm{I}}_2/\mathrm{NaOH}}{\to } \mathrm{B}$

• $\underset{\mathrm{A}}{{\mathrm{H}}_3\mathrm{C}-\mathrm{CO}-{\mathrm{CH}}_3}, \underset{\mathrm{B}}{{\mathrm{CHI}}_3}, \underset{\mathrm{C}}{ {\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_3}$

• $\underset{\mathrm{A}}{{\mathrm{H}}_2\mathrm{C}=\mathrm{CH}-{\mathrm{CH}}_2\mathrm{OH}}, \underset{\mathrm{B}}{{\mathrm{CH}}_3\mathrm{I}},\underset{\mathrm{C}}{ {\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}}$

• $\underset{\mathrm{A}}{{\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2-\mathrm{CHO}}, \underset{\mathrm{B}}{{\mathrm{CHI}}_3}, \underset{\mathrm{C}}{{\mathrm{H}}_3\mathrm{C}-\mathrm{CHOH}-{\mathrm{CH}}_3}$

• $\underset{\mathrm{A}}{{\mathrm{H}}_3\mathrm{C}-\mathrm{CO}-{\mathrm{CH}}_3}, \underset{\mathrm{B}}{{\mathrm{CHI}}_3}, \underset{\mathrm{C}}{{\mathrm{H}}_3\mathrm{C}-{\mathrm{CHOHCH}}_3}$

Identify the product in the following reaction