In each of the following question, a statement of Assertion (A) is given followed by a corresponding statement of Reason (R). Choose the correct answer as:
Assertion (A): H2O is the only hydride of chalcogen which is liquid at ordinary temperature.
Reason (R): In ice, each O atom is surrounded by two covalent bonds and two H-bonds.
Answer & explanation
Correct answer: option 2
H2O is only the hydride of group 16 elements which is liquid at ordinary temperature, whereas all others gases.
In ice, each H2O molecule oxygen is held by two covalent bonds with two hydrogen atoms and two hydrogen bonds with two other water molecules. So both assertion and reason are correct but reason is not the correct explanation for assertion.