Practice Pakistan's most useful MCQs for competitive exams

Chemical composition of cinnabar is____________________?

• (A)  FeS2
• (B)  HgS
• (C)  PbS
• (D)  ZnS

Answer

Submitted By :Ali Uppal

Which one is not the use of silicones________________________?

• (A)  Lubricant
• (B)  Water repellent film
• (C)  Rubber sheet
• (D)  Medicine

Answer

Submitted By :Ali Uppal

Keeping in view the size of atom which is in correct order___________________?

• (A)  Mg > Sr
• (B)  Ba > Mg
• (C)  Lu > Ce
• (D)  CI > 1

Answer

Submitted By :Ali Uppal

A double bond consists of __________________?

• (A)  Two sigma bonds
• (B)  Two Pi bonds
• (C)  One sigma and one Pi bonds
• (D)  One sigma and two Pi bonds

Answer

Submitted By :Ali Uppal

According to vital force theory_______________?

• (A)  Oorganic compounds can be synthesized from inorganic compounds
• (B)  organic compounds cannot be synthesized from inorganic compounds
• (C)  organic compounds can be synthesized by animals
• (D)  organic compounds can be synthesized by plants

Answer

Submitted By :Ali Uppal

Organic compounds that are essentially nonpolar and exhibit weak intermolecular forces have________________?

• (A)  Low melting points
• (B)  Low vapour pressure
• (C)  High boiling points
• (D)  High electrical conductivity

Answer

Submitted By :Ali Uppal

Geometric isomerism is usually found in___________________?

• (A)  Alkanes
• (B)  Alkenes
• (C)  Alkynes
• (D)  Esters

Answer

Submitted By :Ali Uppal

Octane number 2 2 4-trimethyl pentane is__________________?

• (A)  100
• (B)  90
• (C)  80
• (D)  70

Answer

Submitted By :Ali Uppal

Hydro carbons which burn with smoky flame are called_________________?

• (A)  Aliphatic
• (B)  Alicyclic
• (C)  Aromatic
• (D)  Aldehyde

Answer

Submitted By :Ali Uppal

Main source of organic compounds is__________________?

• (A)  Animal
• (B)  Fossil
• (C)  Coal
• (D)  Plants

Answer

Submitted By :Ali Uppal