1.

With respect to the conformers of ethane, which of the following statements is true?

• Bond angle remains same but bond length changes

• Bond angle changes but bond length remains same

• Both bond angle and bond length change

• Both bond angle and bond length change

Which of the following pairs of compounds is isoelectronic and isostructural?

• BeCl₂, XeF₂

• Tel₂, XeF₂

• IBr₂^- , XeF 

• IBr₂^- , XeF 

HgCl₂ and I₂ both when dissolved in water containing I^– ions the pair of species formed is

• HgI₂ , I₃^-

• Hgl₂, I^-

• HgI₄^3-, I₃^-

• HgI₄^3-, I₃^-

Which one is the wrong statement?

• de-Broglie's wavelength is given by λ = h/mv,
  where m = mass of the particle, v = group velocity of the particle

• The uncertainty principle is 

• Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

• Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be

• 1136.5 J

• -500 J

• -505 J

• -505 J

The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration?

• Halogen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵

• Carbon family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²

• Oxygen family,[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴

• Oxygen family,[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴

Match the interhalogen compounds of column I with the geometry in column II and assign the correct code

• (a)	(b)	(c)	(d)
  (iii)	(iv)	(i)	(ii)

• (a)	(b)	(c)	(d)
  (iii)	(i)	(iv	(ii)

• (a)	(b)	(c)	(d)
  (iv)	(v)	(iii)	(ii)

• (a)	(b)	(c)	(d)
  (iv)	(v)	(iii)	(ii)

20-litre container at 400 K contains CO₂(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value, will be

Given that: SrCO₃ ⇌ SrO(s) + CO₂(g) kp = 1.6 atm)

• 5 litre

• 10 litre

• 8 litre

• 8 litre

For a given reaction, ΔH = 35.5 kJ mol^–1 and ΔS = 83.6 JK^–1 mol^–1. The reaction is spontaneous at (Assume that ΔH and ΔS do not vary with temperature)

• T < 425 K

• T > 425 K

• All temperatures

• All temperatures

The correct statement regarding electrophile is

• Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile

• Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile

• Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

• Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile