JEE, NEET, Foundation & CBSE

An ionic solid LaI₂ shows electrical conduction due to presence of
  1. La²⁺ and 2I⁻
  2. La²⁺ , I₂ and 2e–
  3. La³⁺, 2I ⁻and e ⁻
  4. La³⁺ , I₂and 3e ⁻
Which reaction is spontaneous at all temperatures at standard pressure and concentration?
  1. Exothermic reaction with a decrease in entropy
  2. Exothermic reaction with an increase in entropy
  3. Endothermic reaction with a decrease in entropy
  4. Endothermic reaction with an increase in entropy
The reaction of 1-phenylpropane with limited amount of chlorine in the presence of light gives mainly
  1. 1-chloro-1-phenylpropane
  2. 2-chloro-1-phenylpropane
  3. 3-chloro-1-phenylpropane
  4. 4-chloropropylbenzene
When a certain metal was irradiated with light of frequency 3.2 × 10¹⁶ Hz, the photoelectrons emitted had twice the kinetic energy as did the photoelectrons emitted when the same metal was irradiated with light frequency 2.0 × 10¹⁶ Hz. The v₀ of the metal is
  1. 2.4 × 10¹⁶ Hz
  2. 8 × 10¹⁶ Hz
  3. 8 × 10¹⁵ Hz
  4. 7.2 × 10¹⁶ Hz
A rectangle-shaped open-to-sky tank of water has a length of 2 m and a width of 1 m. If atmospheric pressure is assumed to be 100 kPa and thickness of tank walls is assumed to be negligible, force exerted by atmosphere on surface of water is
  1. 20 kN
  2. 50 kN
  3. 100 kN
  4. 200 kN
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