1.

Among the following, the maximum covalent character is shown by the compound

• FeCl₂

• SnCl₂

• AlCl₃

• AlCl₃

The hybridization of orbitals of N atom in NO₃-, NO₂⁺ and NH₄⁺ are respectively

• sp, sp²,sp³

• sp₂ , sp, sp

• sp, sp³ , sp²

• sp, sp³ , sp²

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at

• 1035 nm

• 325 nm

• 743 nm 

• 743 nm 

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm³ at 27°C is

• 38.3 J mol^-1 K^-1

• 35.8 J  mol^-1 K^-1

• 32.3 J  mol^-1 K^-1

• 32.3 J  mol^-1 K^-1

'a' and 'b' are van der Waals constants for gases. Chlorine is more easily liquefied than ethane because :

• a and b for Cl₂ > a and b for C₂H₆

• a and b for Cl₂ < a and b for C₂H₆

• a and Cl₂ < a for C₂H₆ but b for Cl₂ > b for C₂H₆

• a and Cl₂ < a for C₂H₆ but b for Cl₂ > b for C₂H₆

The outer electron configuration of Gd (Atomic No : 64) is

• 4f³ 5d⁵ 6s²

• 4f⁸ 5d⁰ 6s²

• 4f⁴ 5d⁴ 6s²

• 4f⁴ 5d⁴ 6s²

Identify the compound that exhibits tautomerism

• 2-Butene

• Lactic acid

• 2-Pentanone

• 2-Pentanone

Which of the following statement is wrong?

• The stability of hydrides increases from NH₃ to BiH₃ in group 15 of the periodic table.

• Nitrogen cannot form dπ-pπ bond.

• Single N - N bond is weaker than the single P - P bond.

• Single N - N bond is weaker than the single P - P bond.

A 5.2 molal aqueous solution of methyl alcohol, CH₃OH, is supplied. What is the mole fraction of methyl alcohol in the solution?

• 0.100

• 0.190

• 0.086 

• 0.086 

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it form freezing at - 6° C will be : (K_f for water = 1.86 K kg mol^-1, and molar mass of ethylene glycol = 62g mol^-1)

• 804.32 g

• 204.30 g 

• 400.00 g

• 400.00 g