In an atmosphere with industrial smog, copper corrodes to:
I. $C u_{2} (O H)_{2} S O_{4}$
II. $C u_{2} (O H)_{2} C O_{3}$
III. $C u S O_{4}$
IV. $C u C O_{3}$

I and III

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II and IV

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I and IV

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I and II

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Solution

The correct option is D I and II
Corrosion of Copper gives $C u_{2} (O H)_{2} S O_{4}$ and $C u_{2} (O H)_{2} C O_{3}$

$2 C u + H_{2} O + S O_{3} + O_{2} \to C u_{2} (O H)_{2} S O_{4}$

$2 C u_{2} + H_{2} O + C O_{2} + O_{2} \to C u_{2} (O H)_{2} C O_{3}$

Option D is correct.

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Choose the forms in which most plants absorb nitrogen

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(ii) Nitrates and Nitrites
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(iv) Atmospheric nitrogen

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(b) (ii) and (iii)
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Question 30
Choose the forms in which most plants absorb nitrogen

(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

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