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Chemistry MCQs for NEET — Practice Questions with Answers

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Iodine is decolourised by:

$Z n C l_{2}$

$H g C l_{2}$

$S n C l_{2}$

$A l C l_{3}$

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Explanation

(C)

$S n C l_{2} + d r o p b y d r o p I_{2} \underset{}{\to} D e c o l o r i z a t i o n o f I o d i n e S n C l_{2} I_{2}$

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Addition of excess of sodium hydroxide solution to stannous chloride solution, gives:

$S n {(O H)}_{2}$

$S n O_{2} . H_{2} O$

$N a_{2} S n O_{3}$

$N a_{2} S n O_{2}$

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When $S n C l_{2}$ reacts with $H g C l_{2}$ , the product formed are:

$S n + H g C l_{4}$

$S n + C l_{2} + H g_{2} C l_{2}$

$S n C l_{4} a n d H g_{2} C l_{2}$

None of these

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Explanation

Sn will oxidise and Hg will get reduce

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The soldiers of Napolean army while at Alps during freezing winner suffered a serious problem as regards to the tin buttons of their uniforms. White Metallic tin buttons get converted to grey powder. This transformation is related to:

an interaction with water vapour contained in humid air

a change in crystalline structure of tin

a change in the partial pressure of $O_{2}$ in air

an interaction with $N_{2}$ of air low temperature

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Explanation

White tin crumbles into powder due to formation of grey tin at low temperature.

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Which of the following oxide is amphoteric?

CaO

$C O_{2}$

$S i O_{2}$

$S n O_{2}$

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Most ionic chloride is:

$P b C l_{2}$

$C C l_{4}$

$P b C l_{4}$

$S i C l_{4}$

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Explanation

lower the oxidation no , higher is the ionic character.

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Which of the following is amphoteric?

${CO}_{2}$

$P b O_{2}$

$S i O_{2}$

$S e O_{2}$

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Explanation

Lead oxide (PbO₂) is amphoteric oxide and thus reacts with both acids and bases.
- PbO₂ reacts with HCl to form PbCl₂ and H₂O.
PbO₂ + 2HCl $\to$ PbCl₂ + H₂O
- PbO₂ reacts with NaOH to form Na₂PbO₃ and H₂O
PbO₂ + 2NaOH $\to$ Na₂PbO₃ + H₂O

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Which is not used as pigment in paints?

Lead dioxide

White lead

Lead chromate

$P b_{3} O_{4}$

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Lead pipes are corroded by:

$H_{2} S O_{4}$

HCl

$C H_{3} C O O H$

Pure water

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Compound of lead used in match industry is:

PbO

$P b O_{2}$

$P b C l_{2}$

None of these

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Explanation

Lead (II) oxide (PbO2) is the compound of lead used in the match industry. It acts as an oxidizing agent in the ignition mixture of match heads, providing the oxygen needed for combustion.

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