Quiz for Water

Q1: What is the bond angle in a water molecule?

A. 104.5° B. 120° C. 109.5° D. 180°

Q2: Water is a good solvent due to:

A. Its high boiling point B. Hydrogen bonding C. Its polarity D. Both B and C

Q3: Which form of water is most dense?

A. Ice B. Liquid water at 0°C C. Liquid water at 4°C D. Steam

Q4: In water molecule, the hybridization of oxygen is:

A. sp B. sp² C. sp³ D. sp³d

Q5: Heavy water is chemically written as:

A. H₂O B. D₂O C. HDO D. T₂O

Q6: Which of the following is true about heavy water?

A. It is less dense than normal water B. It is more basic C. It has higher boiling point D. It reacts violently with acids

Q7: Water acts as an acid and base in:

A. Redox reactions B. Amphoteric reactions C. Neutralization D. Autoprotolysis

Q8: pH of pure water at 25°C is:

A. 7 B. 6 C. 8 D. 10

Q9: Which is not a property of water?

A. High surface tension B. Low heat of vaporization C. Anomalous expansion D. High specific heat

Q10: Which one is used in nuclear reactors as a moderator?

A. Heavy water B. Salt water C. Pure water D. Distilled water

Q11: In ice, each oxygen atom is surrounded by:

A. 4 hydrogen atoms B. 3 hydrogen atoms C. 2 hydrogen atoms D. 1 hydrogen atom

Q12: Water has maximum density at:

A. 0°C B. 100°C C. 4°C D. 25°C

Q13: Hardness of water is due to presence of:

A. Na⁺ and K⁺ B. Ca²⁺ and Mg²⁺ C. Fe²⁺ and Fe³⁺ D. Zn²⁺ and Cu²⁺

Q14: Boiling point of water is unusually high due to:

A. Van der Waals forces B. Covalent bonding C. Hydrogen bonding D. Dipole-dipole interaction

Q15: Temporary hardness can be removed by:

A. Adding lime B. Boiling C. Adding washing soda D. Adding acid

Q16: Permanent hardness is due to:

A. Chlorides and sulfates of Ca and Mg B. Bicarbonates of Ca and Mg C. Na⁺ and K⁺ salts D. Presence of CO₂

Q17: Soft water lathers easily with soap because:

A. It has more salts B. It has no Ca²⁺ or Mg²⁺ ions C. It has more alkali D. It has more H⁺ ions

Q18: Which process removes both types of hardness?

A. Boiling B. Ion exchange C. Sedimentation D. Filtration

Q19: Which type of bond is present between O and H in water?

A. Ionic B. Hydrogen C. Coordinate D. Covalent

Q20: Water can exist in:

A. Solid state only B. Liquid state only C. Gas state only D. All three states