Multiple choice

Which of the following statements are true? P. Bond angle in PH4+ is lower than that in PH3. Q. H2O is a liquid and H2S a gas. R. NH3 forms hydrogen bond but PH3 does not. S. NH3 is a stronger reducing agent than BiH3.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

H2O has oxygen as the central atom. Oxygen has smaller size and higher electronegativity as compared to sulphur. Therefore, there is extensive hydrogen bonding in H2O, which is absent in H2S.  Hence, H2O exists as a liquid while H2S as a gas. Nitrogen is highly electronegative as compared to phosphorus. This causes a greater attraction of electrons towards nitrogen in NH3 than towards phosphorus in PH3. Hence, NH3 form hydrogen bond but PH3 does not.

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