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Metals

When a copper...

Question

When a copper vessel is exposed to moist air for long, it acquires a coating of

जब कॉपर के पात्र को लम्बे समय तक नम वायु में खुला रखा जाता है, तो इसके ऊपर किसकी परत जम जाती है?

A

CuO

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B

Cu₂S

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C

Cu(OH)₂ + CuCO₃

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D

CuCO₃ + CuO

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Solution

The correct option is C Cu(OH)₂ + CuCO₃

Solution

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Similar questions

Q. When a vessel made up of ‘Z’ is exposed to air for long, it acquires a dull green coating. Similarly when a vessel made up of ‘W’ is exposed to moist air for long it acquires a brown coloured coating.

Now, consider the following reactions.

ZSO₄ + M → A colourless solution of ‘MSO₄’ + Z

ZSO₄ + W → A green coloured solution of ‘WSO₄’ + Z

M, W and Z respectively can be

जब ‘Z’ से बने एक पात्र को लम्बे समय तक वायु में खुला रखा जाता है, तो उस पर एक हल्के हरे रंग की परत जम जाती है। इसी प्रकार, जब ‘W’ से बने पात्र को लम्बे समय तक नम वायु में खुला रखा जाता है, तो उस पर भूरे रंग की परत जम जाती है।

अब, निम्नलिखित अभिक्रियाओं पर विचार कीजिए।

ZSO₄ + M → ‘MSO₄’ का रंगहीन विलयन + Z

ZSO₄ + W → ‘WSO₄’ का हरे रंग का विलयन + Z

M, W तथा Z क्रमशः हो सकते हैं

Assertion : For drying $H_{2} S$ , Conc. $H_{2} S O_{4}$ cannot be used.

Reason: Moist $H_{2} S$ is oxidized by Conc. $H_{2} S O_{4}$

Q. Iron can liberate

H_{2}

H_{2} {S O}_{4}

but copper cannot liberate

H_{2}

H_{2} {S O}_{4}

The correct statement with regard to $H_{2}^{+}$ & $H_{2}^{-}$ is

Q. The reaction of

ClC H_{2} OC H_{2} C H_{3}

with ethanol to form

C H_{3} C H_{2} - O - C H_{2} - OC H_{2} C H_{3}

S_{N} 2

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