JEE, NEET, Foundation & CBSE

The compound that will not react with silver perchlorate under normal conditions is
  1. Polyvinyl chloride
  2. 3-bromocyclopropene
  3. Tetraethyl ammonium chloride
  4. Tetramethylammonium hydroxide
White phosphorous on reaction with NaOH gives PH₃ and
  1. Na₂HPO₃
  2. NaH₂PO₂
  3. NaH₂PO₃
  4. NaH₃PO₄
Which one of the following reactions is correct?
  1. [Fe(CO)₅ ] + 2 NO ⟶ [Fe(CO)₂(NO)₂] + 3 CO
  2. [Fe(CO)₅ ] + 2 NO ⟶ [Fe(CO)₃(NO)₂] + 2 CO
  3. [Fe(CO)₅ ] + 3 NO ⟶ [Fe(CO)₂(NO)₃] + 3 CO
  4. [Fe(CO)₅ ] + 3 NO ⟶ [Fe(CO)₃(NO)₃] + 2 CO
Which of the following statements in not true for Ce ³⁺and Yb³⁺ ?
  1. Both ions are colorless
  2. Both absorb in UV region
  3. Both show f – f transition
  4. Both show 4f to 5d transition
Two wires made of the same material, one thick and the other thin, are connected to form a composite wire. The composite wire is subjected to some tension. A wave travelling along the wire crosses the junction point. The characteristic that undergoes a change at the junction point is
  1. Frequency only
  2. Wavelength only.
  3. Speed of propagation only.
  4. The speed of propagation as well as the wavelength.
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