Question 1

Why is catalyst frequently required for the reactions involving H2 as a reactant?

Accepted Answer

A)  Hydrogen is a gas, it has low solubility. Catalyst can increase its solubility. 
B)  Hydrogen is a small molecule that can easily escape any reaction. Catalyst prevents this by rapidly reacting with H2. 
C)  Due to the strong H-H bond, the reactions with H2 have high activation energy. Catalyst is used to lower this activation energy. 
A)  Hydrogen is a gas, it has low solubility. Catalyst can increase its solubility. 
B)  Hydrogen is a small molecule that can easily escape any reaction. Catalyst prevents this by rapidly reacting with H2. 
C)  Due to the strong H-H bond, the reactions with H2 have high activation energy. Catalyst is used to lower this activation energy. C

Question 2

Find the most common industrial process for the production of H2:

Accepted Answer

A)  using electrolysis of water 
B)  using fossil fuels and water 
C)  using biological methods 
A)  using electrolysis of water 
B)  using fossil fuels and water 
C)  using biological methods B

Question 3

Which of the following statements is not correct:

Accepted Answer

A)  Hydride ligand can bridge two metallic centres in a polynuclear complex 
B)  Since hydride is considered an anionic ligand, d-block hydrides cannot behave as acids. 
C)  Both hydride and dihydrogen can be ligands to the same metal atom. 
A)  Hydride ligand can bridge two metallic centres in a polynuclear complex 
B)  Since hydride is considered an anionic ligand, d-block hydrides cannot behave as acids. 
C)  Both hydride and dihydrogen can be ligands to the same metal atom. B

Question 4

Classify the following molecular hydrides: (i) SiH4 (ii) PH3 and (iii) AsH3.

Accepted Answer

A)  (i) is an electron-precise hydride, (ii) is an electron rich hydride, (iii) is an electron deficient hydride 
B)  All three are electron rich hydrides 
C)  (i) is an electron precise hydride, (ii) and (iii) are electron rich hydrides 
A)  (i) is an electron-precise hydride, (ii) is an electron rich hydride, (iii) is an electron deficient hydride 
B)  All three are electron rich hydrides 
C)  (i) is an electron precise hydride, (ii) and (iii) are electron rich hydrides

Question 5

Which of the following reactions can be used for small-scale (laboratory) production of H2:
(i) Copper and concentrated HCl.
(ii) Aluminium and warm concentrated NaOH solution.
(iii) Group 17 hydride and water.

Accepted Answer

A)  (i) and (iii) 
B)  Only (i) 
C)  Only (ii) 
A)  (i) and (iii) 
B)  Only (i) 
C)  Only (ii)

Question 6

Under which conditions does hydrogen react via a radical mechanism?

Accepted Answer

A)  in a presence of a catalyst 
B)  thermal or photochemical activation 
C)  under high-pressure conditions. 
A)  in a presence of a catalyst 
B)  thermal or photochemical activation 
C)  under high-pressure conditions.

Question 7

The metallic hydrides frequently have ____________ and ____________.

Accepted Answer

A)  (constant composition) and (are hard materials) 
B)  (non-stoichiometry) and (metallic lustre) 
C)  (good solubility) and (low reactivity) 
A)  (constant composition) and (are hard materials) 
B)  (non-stoichiometry) and (metallic lustre) 
C)  (good solubility) and (low reactivity)

Question 8

Hydrogen forms ___________ with the majority of elements from groups 1 and 2.

Accepted Answer

A)  molecular hydrides 
B)  metallic hydrides 
C)  saline hydrides 
A)  molecular hydrides 
B)  metallic hydrides 
C)  saline hydrides

Question 9

Find the correct statement:

Accepted Answer

A)  Tritium is an isotope of hydrogen with three nucleons. 
B)  Deuterium, 2H, forms weaker bonds than 1H. 
C)  Ortho- and para-hydrogen are isotopes of H2 molecule. 
A)  Tritium is an isotope of hydrogen with three nucleons. 
B)  Deuterium, 2H, forms weaker bonds than 1H. 
C)  Ortho- and para-hydrogen are isotopes of H2 molecule.

Question 10

Hydrogen bonding is important for:

Accepted Answer

A)  molecular hydrides 
B)  metallic hydrides 
C)  saline hydrides 
A)  molecular hydrides 
B)  metallic hydrides 
C)  saline hydrides

Why is catalyst frequently required for the reactions involving H₂ as a reactant?

Find the most common industrial process for the production of H₂:

Which of the following statements is not correct:

Classify the following molecular hydrides: (i) SiH₄ (ii) PH₃ and (iii) AsH₃.

Which of the following reactions can be used for small-scale (laboratory) production of H₂: (i) Copper and concentrated HCl. (ii) Aluminium and warm concentrated NaOH solution. (iii) Group 17 hydride and water.

Under which conditions does hydrogen react via a radical mechanism?

The metallic hydrides frequently have and .

Hydrogen forms ___________ with the majority of elements from groups 1 and 2.

Find the correct statement:

Hydrogen bonding is important for:

Atomic Structure

Molecular Structure and Bonding

Molecular Symmetry

The Structures of Simple Solids

Acids and Bases

Oxidation and Reduction

An Introduction to Coordination Compounds

Physical Techniques in Inorganic Chemistry

Periodic Trends

The Group 1 Elements

The Group 2 Elements

The Group 13 Elements

The Group 14 Elements

The Group 15 Elements

The Group 16 Elements

The Group 17 Elements

The Group 18 Elements

The D-Block Elements

The D-Metal Complexes: Electronic Structure and Spectra

Coordination Chemistry: Reactions of Complexes

D-Metal Organometallic Chemistry

The F-Block Metals

Materials Chemistry and Nanomaterials

Green Chemistry

Biological Inorganic Chemistry

Inorganic Chemistry in Medicine

Filters

Exam 10: Hydrogen

Why is catalyst frequently required for the reactions involving H2 as a reactant?

Find the most common industrial process for the production of H2:

Which of the following statements is not correct:

Classify the following molecular hydrides: (i) SiH4 (ii) PH3 and (iii) AsH3.

Which of the following reactions can be used for small-scale (laboratory) production of H2: (i) Copper and concentrated HCl. (ii) Aluminium and warm concentrated NaOH solution. (iii) Group 17 hydride and water.

Under which conditions does hydrogen react via a radical mechanism?

The metallic hydrides frequently have ____________ and ____________.

Hydrogen forms ___________ with the majority of elements from groups 1 and 2.

Find the correct statement:

Hydrogen bonding is important for:

Atomic Structure

Molecular Structure and Bonding

Molecular Symmetry

The Structures of Simple Solids

Acids and Bases

Oxidation and Reduction

An Introduction to Coordination Compounds

Physical Techniques in Inorganic Chemistry

Periodic Trends

The Group 1 Elements

The Group 2 Elements

The Group 13 Elements

The Group 14 Elements

The Group 15 Elements

The Group 16 Elements

The Group 17 Elements

The Group 18 Elements

The D-Block Elements

The D-Metal Complexes: Electronic Structure and Spectra

Coordination Chemistry: Reactions of Complexes

D-Metal Organometallic Chemistry

The F-Block Metals

Materials Chemistry and Nanomaterials

Green Chemistry

Biological Inorganic Chemistry

Inorganic Chemistry in Medicine

Filters

Why is catalyst frequently required for the reactions involving H₂ as a reactant?

Find the most common industrial process for the production of H₂:

Classify the following molecular hydrides: (i) SiH₄ (ii) PH₃ and (iii) AsH₃.

Which of the following reactions can be used for small-scale (laboratory) production of H₂: (i) Copper and concentrated HCl. (ii) Aluminium and warm concentrated NaOH solution. (iii) Group 17 hydride and water.

The metallic hydrides frequently have and .