page 7 | Chemistry - DDCET MCQ - Electrical Engineering Objective

Q71. Which of the following substances is a non-electrolyte?

Sodium chloride \((NaCl)\)

Hydrochloric acid \((HCl)\)

Sugar\( (C_{12}H_{22}O_{11})\)

Ethanol \((CH_3CH_2OH)\)

Q72. A solution is prepared by dissolving 5 g of glucose \((C_6H_{12}O_6)\) in 350 mL of water. What is the molality (m) of the solution?

0.142 m

0.79 m

0.125 m

0.0026 m

Q73. Which one of the following is the weakest type of chemical bond?

Ionic bond

Covalent bond

Metallic bond

Van der Waals force

Q74. Which solution will have the highest electrical conductivity?

\( NH_3\)

\(NaCl\)

\(C_{12}H_{22}O_{11}\)

None of above

Q75. The cell potential of an electrochemical cell will decrease as the reaction proceeds due to:

Increased concentration of reactants

Decreased concentration of products

Internal resistance of the cell

All of the above

Q76. Which of the following factors will increase the degree of ionization of a weak acid?

Higher initial concentration of the acid

Lower pH of the solution

Smaller acid dissociation constant (Ka)

Addition of a common ion

Q77. The "sea of electrons" model in metallic bonding refers to:

A fixed number of electrons surrounding each metal atom.

A cloud of delocalized electrons that move freely throughout the metal.

Electrons tightly bound to the nuclei of individual metal atoms.

Electrons paired up in covalent bonds between metal atoms.

Q78. Which of the following pairs of elements is most likely to form a covalent bond?

Na and Cl

H and F

Mg and S

K and Br

Q79. How do electrolytes differ from non-electrolytes in terms of their effect on boiling point and freezing point of water?

Electrolytes do not affect boiling point or freezing point, while non-electrolytes do.

Electrolytes cause both boiling point and freezing point elevation, while non-electrolytes have no effect.

Electrolytes cause boiling point elevation but freezing point depression, while non-electrolytes do the opposite.

Both electrolytes and non-electrolytes cause boiling point and freezing point elevation in proportion to their concentration.

Q80. What type of electrolyte conducts electricity through the movement of both positive and negative ions?

Ionic electrolyte

Covalent electrolyte

Weak electrolyte

Strong electrolyte

MCQ

Chemistry (DDCET)