MCQs on Hydrogen Bonding

Hydrogen forms a special type of bond called a “hydrogen bond.” This is encountered in many structures composed of molecules that contain H atoms, such as organic molecules and water. A special type of intermolecular force called hydrogen bonds are the attractive forces that exist between the water molecules. Hydrogen bonds occur if F, O or N bind to hydrogen. They are the three most electronegative elements and as such they “trap” electrons to such a degree that the hydrogen bound to them is basically naked protons, undisturbed on the side facing off the bond. Hydrogen bonds are stronger than any other type of intermolecular attraction and much weaker than any ionic or covalent bond.

1. Which one of the following is not an isotope of hydrogen?

1. Deuterium
2. Tritium
3. Ortho hydrogen
4. None of these

Answer: (c)

2. Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy is

1. ortho
2. meta
3. para
4. All have the same energy

Answer: (c)

3. Non-stoichiometric hydrides are produced by

1. palladium, vanadium
2. manganese, lithium
3. nitrogen, fluorine
4. carbon, nickel

Answer: (a)

4. The boiling point of water is exceptionally high because

1. there is a covalent bond between H and O
2. water molecule is linear
3. water molecules associate due to hydrogen bonding
4. water molecules are not linear

Answer: (c)

5. Hydrogen can behave as a metal

1. at very high temperature
2. at very low temperature
3. at very high pressure
4. at very low pressure

Answer: (c)

6. When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together?

1. hydrogen bond formation
2. van der Waals forces
3. covalent attraction
4. ionic interaction

Answer: (a)

7. Hydrogen will not reduce

1. heated cupric oxide
2. heated ferric oxide
3. heated stannic oxide
4. heated aluminium oxide

Answer: (d)

8. Which is true about different forms of hydrogen?

1. ortho hydrogen has same spins of two nuclei clockwise or anticlockwise
2. Para hydrogen has different spins of two nuclei
3. At absolute zero temperature, there is a 100% para form and at high temperature, there is 75% ortho form
4. all are correct

Answer: (d)

9. The reagent commonly used to determine hardness of water titrimetrically is

1. oxalic acid
2. sodium thiosulphate
3. sodium citrate
4. disodium salt of EDTA

Answer: (d)

10. Metal which does not react with cold water but evolves H₂ with steam is

1. Na
2. K
3. Pt
4. Mg

Answer: (d)