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NEET • CHEMISTRY • HYDROGEN

Hydrogen practice · Medium

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Showing 91-94 of 94 questions

91 Medium

91 of 94

Application +4 | -1

5 g of zinc is treated separately with an excess of
(1) dilute hydrochloric acid and
(2) aqueous sodium hydroxide
The ratio of the volume of

{H_2}

evolved in these two reactions is

View answer and explanation

Correct option: B

0.042361111

Option B (0.042361111) is correct. The moles of H2 produced are the same in both reactions, so the ratio of volumes is 1:1. Calculating the moles of Zn and then the volume of H2 allows for the ratio calculation.

92 Medium

92 of 94

Remembering +4 | -1

Hydrogen peroxide is prepared in the laboratory by

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Correct option: A

Passing

\mathrm{C}{\mathrm{O}_2}

into

{\mathrm{Ba}{\mathrm{O}_2}}

Option A is correct because passing

\mathrm{C}{\mathrm{O}_2}

into

{\mathrm{Ba}{\mathrm{O}_2}}

is a method for the laboratory preparation of hydrogen peroxide.

93 Medium

93 of 94

Remembering +4 | -1

Saline hydrides are :

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Correct option: B

Strong reductants

Option B is correct because saline hydrides, formed by alkali and alkaline earth metals, readily donate electrons and thus act as strong reducing agents.

94 Medium

94 of 94

Application +4 | -1

A commercial sample of Hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly

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Correct option: B

0.03

Option B (0.03) is correct because the percentage strength of 10 volume

H_2O_2

is approximately 3%.

Revision notes and key takeaways

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