The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

• spin

• azimuthal

• magnetic

• principal

The formal charges of C and O atoms in CO₂ ( :Ö= C=:Ö) are respectively

• 1, -1

• -1,1

• 2,-2

• 0,0

According to molecular orbital theory, the total number of bonding electron pairs in O₂ is

• 2

• 3

• 5

• 4

Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T)?

• η= Ae^-E/RT

• η= Ae^E/RT

• η= Ae^-E/kT

• η= Ae^-E/T

The number of moles of electrons required to deposit 36 g of Al from an aqueous solution of Al(NO₃)₃ is (At. wt. of Al = 27)

• 4

• 3

• 2

• 1

Which one of the following statements is not correct?

• The pH of 1.0 ×10^-8 M HCl is less than 7.

• The ionic product of water at 25°C is 1.0 ×10^-14 mol²L^-2

• Cl^- is a Lewis acid

• Bronsted Lowry theory cannot explain the acidic character of AlCl₃.

Molar heat capacity (C_p) of water at constant pressure is 75 JK^-1mol^-1. The increase in temperature (in K) of 100 g of water when 1 kJ of heat is supplied to it is

• 2.4

• 0.24

• 1.3

• 0.13

Identify A and B in the following reactions

With respect to chlorobenzene, which of the following statements is not correct ?

• Cl is ortho/para directing

• Cl exhibits + M effect

• Cl is ring deactivating

• Cl is meta directing

Match the following.

• A B C D

  1 4 3 5

• A B C D

  2 4 1 5

• A B C D 

  5 1 4 2

• A B C D

  5 1 3 2