Hydrogen

JEE Chemistry · 84 questions · Page 9 of 9 · Click an option or "Show Solution" to reveal answer

Q81

If the boiling point of H2O is 373 K, the boiling point of H2S will be :

A greater than 300 K but less than 373 K

B equal to 373 K

C more than 373 K

D less than 300 K

Correct Answer

Option D

Solution

Boiling point of H2S < Boiling point of H2O Boiling point of H2S = 213 K

Q82

The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are :

A Mg(HCO3)2 and MgCO3

B Ca(HO3)2 and CaO

C Ca(HCO3)2 and Ca(OH)2

D Mg(HCO3)2 and Mg(OH)2

Correct Answer

Option D

Solution

Accoring to NCERT this is the right reaction Mg(HCO3)2

\overset{\Delta}\longrightarrow

Mg(OH)2 $\downarrow$ + CO2 $\uparrow$ + H2O But right reaction should be, Mg(HCO3)2

\overset{\Delta}\longrightarrow

MgCO3 $\downarrow$ + CO2 $\uparrow$ + H2O

Q83

Match List I with List II .tg .tg LIST I Type of Hydride LIST II Example A. Electron deficient hydride I.

\mathrm{MgH_2}

B. Electron rich hydride II.

\mathrm{HF}

C. Electron precise hydride III.

\mathrm{B_2H_6}

D. Saline hydride IV.

\mathrm{CH_4}

Choose the correct answer from the options given below:

A A-III, B-II, C-I, D-IV

B A-II, B-III, C-I, D-IV

C A-III, B-II, C-IV, D-I

D A-II, B-III, C-IV, D-I

Correct Answer

Option C

Solution

A Electron deficient hydride -> III $\mathrm{B}_2 \mathrm{H}_6$ B Electron rich hydride -> II $\mathrm{HF}$ C Electron precise hydride -> IV $\mathrm{CH}_4$ D Saline hydride -> I $\mathrm{MgH}_2$

Q84

The volume strength of 1M H2O2 is : (Molar mass of H2O2 = 34 g mol–1)

A 5.6

B 22.4

C 11.35

D 16.8

Correct Answer

Option C

Solution

At STP, Volume strength = 11.35 $\times$ Molarity $\therefore$ Volume strength of H2O2 = 11.35 $\times$ 1 = 11.35

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