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Byju's Answer

Standard XII

Chemistry

Classification of Alcohols

Among stateme...

Question

Among statements I-IV, the correct ones are:
(I) Decomposition of hydrogen peroxide gives dioxygen
(II) Like hydrogen peroxide, compounds, such as $K C l O_{3}, P b (N O_{3})_{2}$ and $N a N O_{3}$ when heated liberate dioxygen.
(III) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
(IV) Hydrogen peroxide is used for the manufacture of sodium perborate

I,II, III and IV

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I, II and III only

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I, III and IV only

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I and III only

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Solution

The correct option is A I,II, III and IV
Decomposition of $H_{2} O_{2} : 2 H_{2} O_{2} (l) \to O_{2} (g) + 2 H_{2} O (l)$

Industrially, $H_{2} O_{2}$ is prepared by the auto-oxidation of 2-alklylanthraquinols. $2 K C l O_{3} 150 - 300^{\circ} C - ------ \to 2 K C l + 3 O_{2}$

$2 P b (N O_{3})_{2} 200 - 470^{\circ} C - ------ \to 2 P b O + 4 N O_{2} + O_{2}$

$2 N a N O_{3} \to 2 N a N O_{2} + O_{2}$

Synthesis of sodium perborate:
$N a_{2} B_{4} O_{7} + 2 N a O H + 4 H_{2} O_{2} \to 2 N a B O_{3} + 5 H_{2} O$

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Similar questions

Q. Among the statements (a) - (d), the correct ones are -
(a) Decomposition of hydrogen peroxide gives dioxygen.
(b) Like hydrogen peroxide, compounds , such as

K C l O_{3}, P b (N O_{3})_{2}

and

N a N O_{3}

when heated liberated dioxygen.
(c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
(d) Hydrogen peroxide is used for the manufacture of sodium perborate.

Q. Which of the following reaction(s) can be used for the preparation of alkyl halides ?
(I)

C H_{3} C H_{2} O H + H C l a n h . Z n C l_{2} - ----- \to

(II)

C H_{3} C H_{2} O H + H C l \to

(III)

(C H_{3})_{3} C O H + H C l \to

(IV)

(C H_{3})_{2} C H O H + H C l a n h . Z n C l_{2} - ----- \to

(a) Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare

(i) hydrogen chloride

(ii) water

(iii) sodium hydroxide

(iv) hydrochloric acid

(b) The metal which reacts with cold water to produce hydrogen is

(i) magnesium

(ii) aluminium

(iii) calcium

(iv) iron

(i) top

(ii) bottom

(iii) middle

(iv) none

(d) Hydrogen is responsible for producing

(i) heat and light

(ii) hydrogenated oil

(iii) fertilizers

(iv) all of the above

(e) Hydrogen is

(i) combustible

(ii) non-combustible

(iii) supporter of combustion

(iv) neither supporter nor combustible

(f) Water gas is a mixture of

(i) carbon monoxide and oxygen

(ii) carbon monoxide and hydrogen

(iii) hydrogen and oxygen

(iv) hydrogen and nitrogen

Q. Mark the following statements as true or false
(i) Ordinary hydrogen is a mixture of

75

% ortho and

25

% para- forms
(ii) All the four atoms of moleculle of

H_{2} O_{2}

lie in the same plane.
(iii) Hydrogen peroxide is neutral like water.
(iv)

H_{2} O_{2}

can be prepared from

B a O_{2}

but not from

M n O_{2}

and

P b O_{2}

Q. Give balanced equations for the following reactions:
(i) Potassium permanganate is heated with concentrated hydrochloric acid.
(ii) Lead sulphide is heated with hydrogen peroxide.
(iii) Ozone is treated with potassium iodide solution.

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