Question 1

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

Accepted Answer

A)   molecular hydrides
B)   metallic hydrides
C)   saline hydridesD) A) and B)
E) A) and C)

Question 2

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.D) B) and C)
E) All of the above

Question 3

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.D) A) and B)
E) A) and C) C

Question 4

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.D) All of the above
E) B) and C)

Question 5

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 methodsD) A) and C)
E) A) and B) B

Question 6

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 hydridesD) B) and C)
E) None of the above

Question 7

Hydrogen bonding is important for:

Accepted Answer

A)   molecular hydrides
B)   metallic hydrides
C)   saline hydridesD) All of the above
E) B) and C)

Question 8

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) D) B) and C)
E) A) and C)

Question 9

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.D) All of the above
E) B) and C) B

Question 10

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) D) All of the above
E) A) and B)

Exam 10: Hydrogen

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

Correct Answer
verified

Find the correct statement:

Correct Answer
verified

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

Correct Answer
verified
C

Under which conditions does hydrogen react via a radical mechanism?

Correct Answer
verified

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

Correct Answer
verified
B

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

Correct Answer
verified

Hydrogen bonding is important for:

Correct Answer
verified

The metallic hydrides frequently have and .

Correct Answer
verified

Which of the following statements is not correct:

Correct Answer
verified
B

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.

Correct Answer
verified

Exam 10: Hydrogen

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

Correct AnswerverifiedShow Answer

Find the correct statement:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Under which conditions does hydrogen react via a radical mechanism?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

Hydrogen bonding is important for:

Correct AnswerverifiedShow Answer

The metallic hydrides frequently have ____________ and ____________.

Correct AnswerverifiedShow Answer

Which of the following statements is not correct:

Correct AnswerverifiedB

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.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified
C

Correct Answer
verified

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

Correct Answer
verified
B

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

Correct Answer
verified

Correct Answer
verified

The metallic hydrides frequently have and .

Correct Answer
verified

Correct Answer
verified
B

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.

Correct Answer
verified