THE P-BLOCK ELEMENTS
ONE MARK QUESTIONS
1. Why is boron used in nuclear reactions? Ans:-Because Boron can absorb neutrons.
2. By giving a balanced equation show how B(OH)3 behaves as an acid in water.
Ans:-B(OH)3 +2HOH [B(OH)4]- +H3O+
3.Name the element of group 14 which exhibits maximum tendency for catenation?
Ans:-Carbon
4. What is the basic building unit of all silicates? Ans:-SiO44-is the basic unit of all silicates.
5. What happens when NaBH4 reacts with iodine?
| Ans:-2NaBH4 +I | | B2H6 +2NaI +H2. | |
| 6. | What happens when boric acid is heated | ||
| Ans:-4H3BO3 | 4HBO | H2B4O7. | |
| 7. | What is producer gas? | | |
Ans:-Producer gas is a mixture of CO and N2 in the ratio of 2:1.
8.Write the state of hybridization of ‘B’ in BF3. ANS:-Hybridisation of ‘B’ in BF3is Sp2.
9.Mention the state of hybridization in B in BH4-. Ans:-Sp3.
10. Which oxide of carbon is regarded as anhydride of carbonic acid. Ans:-CO2is regarded as a hydride of carbonic acid .
Because H2CO3→ H2O + CO2
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