Question

Give reason .
1) Concentrate nitric acid can be transpoted in Aluminum container.
2)graphite is used as lubricant

3) explain why there is phenomenal decrease in ionization energy from Carbon To Silicon ​

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Answer 1

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1) Concentrate nitric acid can be transpoted in Aluminum container.

$\longrightarrow \:$ Aluminium reacts with nitric acid to form Aluminium oxide on its surface which protect it from further action and hence conc. nitric acid can be transported in Aluminum container.

Reaction :

$\boxed{\sf{ \blue{ 2Al \: + \: 6HNO_3 \longrightarrow \: Al_2 O_3 \: + \: 6NO_2 \: + \: 3H_2 O}}}$

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2) Graphite is used as lubricant.

$\longrightarrow \:$ Graphite has a layer structure, which are held by weak vander waal forces and hence can be made to sleep one another. Therefore, graphite acts as a lubricant.

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3) Explain, Why there is phenomenal decrease in ionization energy from Carbon To Silicon ?

$\longrightarrow \:$ Both Carbon(C) and Silicon(Si) belongs to 13th Group of Modern Periodic Table and are of p-block elements. As due to increase in atomic size and screening effect, effective nuclear charges decreases from C To Si. Thus, there is a phenomenal decrease in ionization energy of C to Si.

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