The lightest gas is :

(a) nitrogen

(b) helium

(c) oxygen

(d) hydrogen

Subtopic:  Preparation & Properties |
 82%
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The critical temperature of water is higher than that of O2 because H2O molecule has:

(a) fewer electrons than oxygen

(b) two covalent bonds

(c) V-shape

(d) dipole moment

Subtopic:  Water |
 68%
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Benzene is oxidized by H2O2 in presence of FeSO4 to:

(a) phenol

(b) cyclohexane

(c) benzaldehyde

(d) benzoic acid

Subtopic:  H2O2 (Hydrogen Peroxide) |
 61%
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The oxidizing property of H2O2 is best explained by assuming that two oxygen atoms in its molecule are:

(a) bonded differently

(b) bonded similarly

(c) bonded covalently

(d) bonded by hydrogen bonds

Subtopic:  H2O2 (Hydrogen Peroxide) |
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10 volumes of H2O2 has a strength of approximately:

(1) 3%

(2) 30%

(3) 10%

(4) 5%

Subtopic:  H2O2 (Hydrogen Peroxide) |
 69%
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From the following statements regarding H2O2, choose the incorrect statement:

(1) It can act only as an oxidising agent

(2) It decomposes on exposure to light

(3) It has to be stored in plastic or wax lined glass bottles in dark

(4) It has to be kept away from dust

Subtopic:  H2O2 (Hydrogen Peroxide) |
 82%
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H2O2 turns an acidified solution of ........ to orange red.

(a) BaO2

(b) PbO2

(c) Na2O2

(d) TiO2

Subtopic:  H2O2 (Hydrogen Peroxide) |
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Which is not true in case of H2O2?

(1) It is more stable in basic solution

(2) It acts as strong oxidising agent in acid and basic solutions

(3) It is decomposed by MnO2

(4) It behaves as reducing agent towards KMnO4

Subtopic:  H2O2 (Hydrogen Peroxide) |
 59%
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Decmposition of H2O2 is retarded by:

(a) acetanilide

(b) alcohol

(c) H3PO4

(d) all of these

Subtopic:  H2O2 (Hydrogen Peroxide) |
 86%
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Point out the incorrect statement.

(1) Hardness of water depends upon its soap consuming power

(2) Temporary hardness is due to bicarbonates of calcium and magnesium

(3) Permanent hardness is due to soluble sulphates, chlorides and nitrates of Ca and Mg

(4) Permanent hardness can be removed by boiling water

Subtopic:  H2O2 (Hydrogen Peroxide) |
 83%
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