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Tests for Sulphuric Acid

While testing...

Question

While testing for second group, after the addition of hydrogen sulphide if yellow colour appears then it confirms the presence of :

A

Cadmium

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B

lead

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C

Tin and cadmium

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D

tin

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Solution

The correct option is C Tin and cadmium
2nd group is detected by adding the salt in water and then dilute hydrochloric acid followed by hydrogen sulfide. If it forms a reddish-brown or black precipitate then Bi³⁺, Cu²⁺, Hg²⁺ or Pb²⁺ is present if it forms a yellow precipitate, then Cd²⁺ or Sn⁴⁺ is present.

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Q. A test for complete removal of

C u^{2 +}

N H_{3}

(aq). A blue colour signifies the formation of complex

[C u (N H_{3})_{4}]^{2 +}

K_{f}

\times

10^{13}

and thus confirms the presence of

C u^{2 +}

in solution. 250 mL of 0.1 M

C u S O_{4}

(aq) is electorlysed by passing a current of 3.512 ampere for 1368 second. After passage of this charge sufficient quantity of

N H_{3}

(aq) is added to electrolysed solution maintaining

[N H_{3}]

[C u (N H_{3})_{4}]^{2 +}

is detectable upto its concentration as low as 1

\times 10^{- 5}

, would a blue colour be shown by the electrolysed solution on addition of

N H_{3}

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