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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
s Block Elements

NTA Abhyas 2020 · Chemistry · s Block Elements

Among Ca H _ 2 , N H _ 3 , NaHand B _ 2 H _ 6 , which are covalent...

Among CaH2,NH3,NaHandB2H6,Ca{H}_{2}, N{H}_{3}, NaHand{B}_{2}{H}_{6}, which are covalent hydride?

Options

  1. ANH3andB2H6N{H}_{3}and{B}_{2}{H}_{6}
  2. BNaHandCaH2NaHandCa{H}_{2}
  3. CNaHandNH3NaHandN{H}_{3}
  4. DCaH2andB2H6Ca{H}_{2}and{B}_{2}{H}_{6}

Correct answer

A. NH3andB2H6N{H}_{3}and{B}_{2}{H}_{6}

Step-by-step solution

Hydrides are binary compounds of hydrogen. These can be classified in four groups viz :

(i) Ionic hydrides e.g., NaH,CaH2,LiHetc.NaH, Ca{H}_{2}, LiHetc.

(ii) Covalent hydrides e.g., B2H6,NH3,SbH3etc.{B}_{2}{H}_{6}, N{H}_{3}, Sb{H}_{3}etc.

(iii) Polynuclear hydrides e.g., LiAlH4,NaBH4etc.LiAl{H}_{4}, NaB{H}_{4}etc.

(iv) Interstitial hydrides, in which hydrogen is trapped in the interstial spaces of transition metals.
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