Practice Pakistan's most useful MCQs for competitive exams

Quantum number values for 3p orbitals are____________________?

• (A)  n=3 l=2
• (B)  n=3 l=0
• (C)  n=3 l=1
• (D)  n=3 l=3

Answer

Submitted By :Ali Uppal

Only London dispersion forces are present among the_________________?

• (A)  Molecules of water in liquid state
• (B)  Atoms of helium in gaseous state at high temperature
• (C)  Molecules of hydrogen chloride gas
• (D)  Molecules of solid iodine

Answer

Submitted By :Ali Uppal

The molecules of CO2 in dry ice form__________________?

• (A)  Ionic crystal
• (B)  Covalent crystal
• (C)  Molecular crystal
• (D)  Any type of crystal

Answer

Submitted By :Ali Uppal

Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?

• (A)  one / seventeen
• (B)  sixteen / seventeen
• (C)  one / three
• (D)  two / three

Answer

Submitted By :Ali Uppal

When CO2 is made to react with ethy1 magnesium iodide in dry ether followed by acid hydrolysis yields______________?

• (A)  Carboxylic acid
• (B)  Ethanoic acid
• (C)  Propanoic acid
• (D)  Butanoic acid

Answer

Submitted By :Ali Uppal

Which one of the following will be sulphonated readily ?

• (A)  Chlorobenzene
• (B)  Toluene
• (C)  Nitrobenzene
• (D)  Benzene

Answer

Submitted By :Ali Uppal

When benzene is heated in air with V2O5 at 450°C yields_________________?

• (A)  Phenol
• (B)  Maleic anhydride
• (C)  Glyoxal
• (D)  Benzoic acid

Answer

Submitted By :Ali Uppal

In 1 – pentene -4- yne the carbon exhibit hybridization_________________?

• (A)  sp3 – sp2
• (B)  sp2 – sp
• (C)  sp2 – sp
• (D)  sp3 – sp2 – sp

Answer

Submitted By :Ali Uppal

Which one of the following looks odd__________________?

• (A)  H2SO4
• (B)  KMnO4
• (C)  H2S
• (D)  K2CrO4

Answer

Submitted By :Ali Uppal

The most paramagnetic element is____________________?

• (A)  Iron
• (B)  Cobalt
• (C)  Chromium
• (D)  Manganese

Answer

Submitted By :Ali Uppal