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Hydrogen question bank (Chemistry)

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Q1.

An indicator ‘ $X$ ’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $H_{2} O_{2}$ at room temp. The indicator ‘ $X$ ’ forms blue colored complex with compound ‘ $A$ ’ present in the solution. The indicator ‘ $X$ ’ and compound ‘ $A$ ’ respectively are

(A)

Starch and iodine

(B)

Methyl orange and

H_{2} O_{2}

(C)

Starch and

H_{2} O_{2}

(D)

Methyl orange and iodine

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Q2.

The products obtained during treatment of hard water using Clark's method are

(A)

{CaCO}_{3}

and

{MgCO}_{3}

(B)

Ca {(OH)}_{2}

and

Mg {(OH)}_{2}

(C)

{CaCO}_{3}

and

Mg {(OH)}_{2}

(D)

Ca {(OH)}_{2}

and

{MgCO}_{3}

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