page 8 | Chemistry - DDCET MCQ - Electrical Engineering Objective

Q81. The pair of elements which on combination are most likely to form an ionic compound is:

Na and Ca

K and O

O and Cl

Al and I

Q82. The high boiling point of water compared to its similar-sized hydrides \((H_2S, H_2Se, H_2Te)\) is primarily due to

dipole-dipole interactions

covalent bonding

hydrogen bonding

metallic bond

Q83. Which of the following is an example of a weak electrolyte?

Hydrochloric acid \((HCl)\)

Acetic acid \((CH_3COOH)\)

Sodium hydroxide\( (NaOH)\)

Potassium nitrate \((KNO_3)\)

Q84. A buffer solution maintains a constant pH because it...

has a high concentration of acid or base

has equal concentrations of a weak acid and its conjugate base

has a limited capacity to neutralize added acid or base

reacts with water to produce hydroxide ions

Q85. Which of the following factors strengthens metallic bonds?

Increased number of valence electrons per atom

Decreased electronegativity of the metal atoms

Smaller atomic radius of the metal atoms

Presence of non-metallic elements in the metal

Q86. Which of the following factors can increase the solubility of a non-electrolyte in water?

Increasing the temperature

Adding a polar co-solvent

Both (a) and (b)

None of the above

Q87. Which of the following statements about reduction is FALSE?

Gain of electrons

Decrease in oxidation state

Release of H+ ions

Increase in electronegativity

Q88. Which of the following statements is true about coordinate covalent bonds?

They are weaker than ionic bonds.

They are stronger than covalent bonds.

They have the same strength as covalent bonds.

Their strength varies depending on the specific atoms involved.

Q89. Which of the following is a characteristic of a coordinate covalent bond?

It involves the complete transfer of electrons from one atom to another.

It involves the sharing of electrons between atoms of equal electronegativity.

It involves the sharing of electrons between atoms of different electronegativity.

It involves the sharing of electrons where both electrons are donated by one atom.

Q90. Which of the following factors does NOT affect the efficiency of an electrochemical cell?

Surface area of the electrodes

Concentration of the electrolytes

Temperature of the cell

Type of material used for the electrodes

MCQ

Chemistry (DDCET)