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The p-Block Elements

Short Answer Type

151.

Why dilute H₂SO₄ cannot be used for the laboratory preparation of carbon dioxide?

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152.

Why is it dangerous to sleep in a closed room in which coal is burning ?

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153.

Explain the following phenomenon by means of balanced equations:
(i) When exhaling is made through a tube passing into a solution of lime water, solution becomes turgid.
(ii) The turbidity of the above solution.
(iii) eventually disappears when continued exhaling is made through it.

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154.

What is dry ice? Why is it so called?

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155. Suggest a reason as to why CO is poisonous.

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156.

How is excessive content of CO₂responsible for global warming?

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157.

Write the resonance structures of $CO subscript 3 superscript 2 minus end superscript space and space HCO subscript 3 superscript minus$

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158.

What is the state of hybridization of carbon in (a) $CO subscript 3 superscript 2 minus end superscript$ (b) diamond (c) graphite?

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Long Answer Type

159.

Explain why silicon tetrachloride is hydrolyzed but carbon tetrachloride is not hydrolysed.

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Short Answer Type

160.
Contrast the structure and properties of CO₂ and SiO_2.

Carbon dioxide(CO₂)	Silica (SiO₂)
1. It is a monomeric linear gaseous molecule as O =C = O	1. It is a solid network having a three-dimensional structure in which each silicon atom is tetrahedrally surrounded by four oxygen atoms.
2. It is soluble in water.	2. It is insoluble in water.
3. On reduction with coke (carbon), it forms carbon monoxide	3. On reduction with carbon in an electric furnace, it produces silicon carbide.