NCERT Solutions for Class 11 Chemistry Chapter 9: Hydrogen

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NCERT Solutions for Class 11 Chemistry Chapter 9 Hydrogen is provided in this article. Some of the important topics of Hydrogen chapter include:

As this topic has been omitted from the new CBSE Class 11 syllabus, no questions can be expected from this chapter. But it would be useful for other competitive exams.

Download PDF: NCERT Solutions for Class 11 Chemistry Chapter 9 pdf

NCERT Solutions for Class 11 Chemistry Chapter 9

NCERT Solutions for Class 11 Chemistry Chapter 9 Hydrogen is given below.

Class 11 Chemistry Chapter 9 Hydrogen – Important Questions

Hydrogen is the lightest atom and has only one proton and no neutrons. The three stable isotopes of hydrogen are:

Protium
Deuterium
Tritium

The first element in the periodic table is Hydrogen. It is placed in 'Group 1' of the periodic table on the basis of its configuration (1s¹).

Properties of Hydrogen:

Hydrogen is a colourless and odourless non-toxic gas.
It has the lowest density among all the other gases.
Hydrogen is the most abundant element in the universe.
Melting point of Hydrogen is -259.16° C.
Boiling point of Hydrogen is -252.879° C.
Density of Hydrogen is 0.000082 gram cm^-3.
Atomic mass of Hydrogen is 1.008.

Hydrides are the compounds of hydrogen with less electronegative elements. Hydrides are of three types:

Ionic Hydrides
Covalent or Molecular Hydrides
Metallic Hydrides

Related Articles:

Hard Water and Soft Water	Heavy Water	Hydrogen Peroxide
Chemical Properties of Water	Physical Properties of Water	Barium Hydroxide
Hydrofluoric Acid	Potassium Dihydrogen Phosphate	Potassium Hydrogen Phosphate

Class 11 CBSE Chemistry Study Guides:

NCERT Solutions for Class 11 Chemistry	Important Chemistry Formulas	Chemistry Study Material
Difference between Articles in Chemistry	Important Named Reactions	Chemistry Notes
NCERT Solutions for Class 11 Biology	NCERT Solutions for Class 11 Physics	NCERT Solutions for Class 11 Maths

CBSE CLASS XII Related Questions

1.
(i) A first order reaction is 20% complete in 10 minutes. Calculate the time taken when 80% of the reaction will be completed.
[Given : log 5 = 0.7, log 4 = 0.6]
(ii) For a chemical reaction \( \mathrm{R \rightarrow P} \), variation in \( \ln[\mathrm{R}] \) vs. time (t) graph is given below :
(I) Predict the order of the reaction.
(II) Write the slope of the curve.
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2.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.
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3.
(i) Why do Zr and Hf exhibit similar properties ?
(ii) "\( E^\circ \) for \( \mathrm{Mn^{3+}/Mn^{2+}} \) couple is more positive than that for \( \mathrm{Fe^{3+}/Fe^{2+}} \)." Justify the statement.
[Atomic number : Mn = 25, Fe = 26]
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4.
Draw the structure of 'X' in the following reaction:
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5.
Which of the following curve represents the first order reaction?
- A
- B
- C
- D
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6.
Consider the decomposition of hydrogen peroxide \( (\mathrm{H_2O_2}) \) as per the equation given below : \[ 2\mathrm{H_2O_2} \xrightarrow[\text{Alkaline medium}]{I^-} 2\mathrm{H_2O} + \mathrm{O_2} \] The mechanism for this reaction was found to be : Step I : \( \mathrm{H_2O_2} + I^- \longrightarrow \mathrm{H_2O} + IO^- \) (slow) Step II : \( \mathrm{H_2O_2} + IO^- \longrightarrow \mathrm{H_2O} + I^- + \mathrm{O_2} \) (fast) (a) Write the rate law expression. (b) Determine the order of reaction with respect to \( \mathrm{H_2O_2} \), \( I^- \) and overall order of reaction. (c) What is the molecularity of the reaction in Step II ?
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