The p-Block Elements

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Question

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Question 1 : Red phosphorus is chemically less reactive because
1. It does not catch fire in air even upto 400°C
2. It does not contain P – P bonds
3. It has a polymeric structure
4. None of these
Answer
8730

Question 2 :

Which of the following will not produce hydrogen gas?

1. Reaction between Zn and NaOH
2. Reaction between Zn and conc. H₂SO₄
3. Electrolysis of NaCl in Nelsons cell
4. Reaction between Fe and dil. HCl
Answer
8731

Question 3 :

The structure of diBorane contains ______________

1. Two 2c – 2e bonds and two 3c – 2e bonds
2. Four 2c – 2e bonds and two 3c – 2e bonds
3. Four 2c – 2e bonds and four 3c – 2e bonds
4. Two 2c – 2e bonds and two 3c – 3e bonds
Answer
8732

Question 4 :

Oxygen gas can be prepared from solid KMnO₄ by ____________

1. Strongly heating the solid
2. Dissolving the solid in conc. H₂SO₄
3. Treating the solid with H₂ gases
4. Dissolving the solid in dil. HCl
Answer
8733

Question 5 :

n the upper layers of atmosphere ozone is formed _______________

1. By action of ultraviolet rays on oxygen molecule
2. By action of electric discharge on oxygen molecule
3. Due to sudden drops of pressure
4. By action of infrared rays on oxygen molecule
Answer
8734