One Mark => CHAPTER 11 The p-block elements Short Questions Answers

ONE MARK QUESTIONS
Q.1. Why is boron used in nuclear reactions?
Ans: Because Boron can absorb neutrons.

Q.2. By giving a balanced equation show how B(OH)₃ behaves as an acid in water.
Ans:-B(OH)₃ +    2H₂O  ==>   [B(OH)₄]^-     +     H₃O⁺

Q.3.Name the element of group 14 which exhibits maximum tendency for catenation?
Ans: Carbon

Q.4. What is the basic building unit of all silicates?
Ans: (SiO₄)^4-is the basic unit of all silicates.

Q.5. What happens when NaBH₄ reacts with iodine?
Ans: 2NaBH₄     +     I₂      ==>     B₂H₆     +     2NaI    +    H2.
Q.6. What happens when boric acid is heated
Ans:       4H₃BO₃    ==>   4HBO₂    ==>    H₂B₄O₇.

Q.7. What is producer gas?
Ans: Producer gas is a mixture of CO and N₂ in the ratio of 2:1.

Q.8.Write the state of hybridization of ‘B‘ in BF₃.
Ans: Hybridisation of ‘B‘ in BF₃ is Sp².

Q.9.Mention the state of hybridization in B in (BH₄)^-.
Ans: Sp³.

Q.10. Which oxide of carbon is regarded as anhydride of carbonic acid.
Ans: CO₂ is regarded as a hydride of carbonic acid .
Because H₂CO₃    →      H₂O + CO_2.