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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

NTA Abhyas 2020 · Chemistry · p Block Elements (Group 13 & 14)

Which of the following set is having correct statements here...

Which of the following set is having correct statements here regarding both B and Al?
1.1. They combine with nitrogen to form nitrides
2.2. They react with HCl to form chlorides
3.3. They burn in oxygen to give oxides at high temperature
4.4. Their halides are Lewis acids

Options

  1. A1, 4
  2. B3, 4
  3. C1, 3, 4
  4. D1, 2, 3, 4

Correct answer

C. 1, 3, 4

Step-by-step solution

Both B and Al can react with nitrogen to form nitride as follows
2B+N2→2BN2B + {N}_{2} \to 2BN
2Al+N2→2AlN2Al + {N}_{2} \to 2AlN
Boron is not attacked by HCl; while Al reacts with HCl to from AlCl3AlC{l}_{3} and H2(g){H}_{2} ( g ).
Both B and Al can react with oxygen to form their oxides.
4B+3O2→2B2O34B + 3{O}_{2} \to 2{B}_{2}{O}_{3}
4Al+3O2→2Al2O34Al + 3{O}_{2} \to 2A{l}_{2}{O}_{3}
Halides of both (BX3,AlX3)( B{X}_{3}, Al{X}_{3} ) are electron deficient molecule, so they act as Lewis acids.
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