MCQOPTIONS
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MCQOPTIONS
This section includes 181 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
In electrolysis of dilute HCl, at cathode |
| A. | oxygen gas is given off |
| B. | hydrogen gas is given off |
| C. | chlorine gas is given off at anode |
| D. | hydrogen chloride is given off |
| Answer» C. chlorine gas is given off at anode | |
| 102. |
Graphite is a conductor of electricity because |
| A. | it has valence electrons |
| B. | it is a non-metal form of Carbon |
| C. | it is an allotrope of Carbon |
| D. | both a and b |
| Answer» E. | |
| 103. |
Examples of non-electrolyte includes |
| A. | oil |
| B. | paraffin |
| C. | alcohol |
| D. | all of these |
| Answer» E. | |
| 104. |
Electrolysis refers to the |
| A. | passing of cathode in molten solid |
| B. | passing electricity through a solution or molten solid |
| C. | substance that does not allow the flow of electricity |
| D. | copper plating of utensils |
| Answer» C. substance that does not allow the flow of electricity | |
| 105. |
Anodic oxidation refers to the |
| A. | loss of electrons at the anode |
| B. | gain of electrons at the cathode |
| C. | loss of electrons at the cathode |
| D. | gain of electrons at the anode |
| Answer» B. gain of electrons at the cathode | |
| 106. |
Electricity is not conducted by |
| A. | plastic |
| B. | non-metals |
| C. | solid ionic substances |
| D. | all of these |
| Answer» E. | |
| 107. |
A strong electrolyte solution makes a bulb |
| A. | shine brightly |
| B. | shine dimly |
| C. | does not shine at all |
| D. | burst or fuse |
| Answer» B. shine dimly | |
| 108. |
A non-electrolyte |
| A. | does not conduct electricity |
| B. | is a covalent substance |
| C. | does not form ions |
| D. | all of these |
| Answer» E. | |
| 109. |
Weak electrolytes include |
| A. | limewater Ca(OH)₂ |
| B. | ammonia solution NH₃ |
| C. | Carbonic acid H₂CO₃ |
| D. | all of these |
| Answer» E. | |
| 110. |
Battery is |
| A. | 99.5% pure copper |
| B. | collection of cells |
| C. | pure lead |
| D. | pure zinc |
| Answer» C. pure lead | |
| 111. |
Ethanoic acid (CH₃COOH) is included in |
| A. | strong electrolyte |
| B. | non-electrolyte |
| C. | weak electrolyte |
| D. | good conductors |
| Answer» D. good conductors | |
| 112. |
Faraday unit is named after a scientist |
| A. | Michael Faraday |
| B. | Faraday John |
| C. | Samuel faraday |
| D. | George Smith |
| Answer» B. Faraday John | |
| 113. |
The quantity of electricity is expressed in a unit called |
| A. | Faraday |
| B. | mol |
| C. | gram |
| D. | watts |
| Answer» B. mol | |
| 114. |
1 mole of Cl₂ requires electricity of |
| A. | 2 faraday |
| B. | 1 faraday |
| C. | 4 faraday |
| D. | 3 faraday |
| Answer» B. 1 faraday | |
| 115. |
Number of faradays required to discharge 1 mole of an ion is equal to charge on that ion is |
| A. | Faraday's first law |
| B. | Faraday's second law |
| C. | Lenz's first law |
| D. | Lenz's second law |
| Answer» C. Lenz's first law | |
| 116. |
Polarization occurs due to |
| A. | rapid dissolving of magnesium in dilute acid |
| B. | slow dissolving of magnesium in conc. Acid |
| C. | copper electrode gets covered with bubbles of hydrogen gas |
| D. | copper electrode gets covered with bubbles of ammonia gas |
| Answer» D. copper electrode gets covered with bubbles of ammonia gas | |
| 117. |
Conventionally, negative terminals is shown as |
| A. | a long thin line |
| B. | a short fat line |
| C. | a long wavy line |
| D. | a short wavy line |
| Answer» C. a long wavy line | |
| 118. |
Cations are |
| A. | positively charged ions |
| B. | negatively charged ions |
| C. | travel towards anode during electrolysis |
| D. | travel towards anode during polarization |
| Answer» B. negatively charged ions | |
| 119. |
Duration of bright-bulb is shorter in a magnesium-copper battery because |
| A. | the difference of copper ad magnesium in reactivity series is lesser |
| B. | the polarization occurs too quickly |
| C. | magnesium is highly reactive and dissolves very rapidly in acid |
| D. | all of these |
| Answer» D. all of these | |
| 120. |
Examples of non-conductors include |
| A. | sulphur |
| B. | phosphorus |
| C. | wood |
| D. | all of these |
| Answer» E. | |
| 121. |
Duration of bright-bulb can be enhanced, if along with copper |
| A. | magnesium is used |
| B. | the acid is more dilute |
| C. | zinc |
| D. | graphite |
| Answer» D. graphite | |
| 122. |
In a dry cell, leaking occurs because |
| A. | zinc electrode has dissolved away |
| B. | carbon electrode has dissolved away |
| C. | magnese oxide has been used up |
| D. | polarization cannot more be prevented at carbon electrode |
| Answer» B. carbon electrode has dissolved away | |
| 123. |
In electrolysis of concentrated HCl, Cl₂ is given off at cathode due to |
| A. | difficulty of discharging hydroxide ions |
| B. | difficulty of discharging chloride ions |
| C. | due to high concentration of Chloride ions |
| D. | ease of discharging chloride ions compared to the hydroxide ions |
| Answer» D. ease of discharging chloride ions compared to the hydroxide ions | |
| 124. |
Ethanol C₂H₅OH(I) is an example of |
| A. | strong electrolyte |
| B. | non-electrolyte |
| C. | weak electrolyte |
| D. | carboxylic acid |
| Answer» C. weak electrolyte | |
| 125. |
Purpose of a voltmeter is to |
| A. | ensure constant flow of electricity |
| B. | measure amount of current |
| C. | measure voltage of cells and batteries |
| D. | help bulbs to glow |
| Answer» D. help bulbs to glow | |
| 126. |
Difficulty of discharge is lowest in |
| A. | calcium ions |
| B. | sodium ions |
| C. | magnesium ions |
| D. | zinc ions |
| Answer» E. | |
| 127. |
In a dry cell, polarization |
| A. | cannot be prevented |
| B. | is prevented through ammonium nitrate mixture |
| C. | is prevented through magnese oxide |
| D. | is prevented through a NaOH mixture |
| Answer» D. is prevented through a NaOH mixture | |
| 128. |
Hydrogen gas is given off at cathode, if solution |
| A. | contains dilute HCl |
| B. | contains concentrated HCl |
| C. | is non-electrolyte |
| D. | both a and b |
| Answer» E. | |
| 129. |
Electrodes may be made up of metals like |
| A. | Gold |
| B. | Silver |
| C. | Graphite |
| D. | Manganese |
| Answer» D. Manganese | |
| 130. |
Amount of current can be measured in |
| A. | kilojoules |
| B. | Amperes |
| C. | Horsepower |
| D. | therbligs |
| Answer» C. Horsepower | |
| 131. |
Least reactive metal in given series is |
| A. | tin |
| B. | copper |
| C. | lead |
| D. | silver |
| Answer» E. | |
| 132. |
A substance which conducts electricity but is not changed during electrolysis is |
| A. | electrode |
| B. | conductor |
| C. | insulator |
| D. | catalyst |
| Answer» C. insulator | |
| 133. |
Pure water (H₂O) is an example of |
| A. | strong electrolyte |
| B. | non-electrolyte |
| C. | weak electrolyte |
| D. | poor insulator |
| Answer» C. weak electrolyte | |
| 134. |
Easy to shape materials like ceramics are used as |
| A. | conductors |
| B. | insulators |
| C. | electrodes |
| D. | catalysts |
| Answer» C. electrodes | |
| 135. |
Sulfurous Acid (H₂SO₃) is |
| A. | strong electrolyte |
| B. | non-electrolyte |
| C. | weak electrolyte |
| D. | white in color |
| Answer» D. white in color | |
| 136. |
Selective discharge occurs |
| A. | if more difference is in the reactivity series |
| B. | if low difference is in the activity series |
| C. | if more than one type of anions is attracted to cathode |
| D. | if more than one type of anions or Cations are attracted to the cathode or anode |
| Answer» E. | |
| 137. |
In electrolysis of aqueous solutions of dilute acids or dilute alkalis, amount of hydrogen given off is |
| A. | roughly half of the oxygen given off at the anode |
| B. | roughly the same as of oxygen given off at anode |
| C. | is roughly twice the oxygen given off at anode |
| D. | is roughly twice the oxygen given off at cathode |
| Answer» D. is roughly twice the oxygen given off at cathode | |
| 138. |
In non-metals, half cells of electricity are conducted via solution by |
| A. | platinum wire only |
| B. | platinum foil only |
| C. | aluminum foil |
| D. | platinum wire and foil |
| Answer» E. | |
| 139. |
Electrode may not be made up of |
| A. | Mercury |
| B. | Gold |
| C. | Platinum |
| D. | Copper |
| Answer» C. Platinum | |
| 140. |
The standard electrode potential for any half-cell is the measurement of |
| A. | voltage |
| B. | ions apart |
| C. | radii of ions |
| D. | deposited ions |
| Answer» B. ions apart | |
| 141. |
The cathode production the electrolysis of zinc iodide is |
| A. | iodine |
| B. | zinc |
| C. | zinc oxide |
| D. | chloride |
| Answer» C. zinc oxide | |
| 142. |
A conductor |
| A. | changes while conducting electricity |
| B. | does not change while conducting electricity |
| C. | does not allow flow of electricity |
| D. | cannot operate at high pressures |
| Answer» C. does not allow flow of electricity | |
| 143. |
Brightness of battery light depends on the |
| A. | polarization |
| B. | difference in the reactivity series of two metals in the battery |
| C. | volts of bulb attached to the battery |
| D. | all of these |
| Answer» C. volts of bulb attached to the battery | |
| 144. |
Most reactive metal in given series is |
| A. | magnesium |
| B. | zinc |
| C. | iron |
| D. | tin |
| Answer» B. zinc | |
| 145. |
The origin of word ceramic is a Greek word Keramikos which mean |
| A. | pottery |
| B. | painting |
| C. | knitting |
| D. | metal |
| Answer» B. painting | |
| 146. |
Examples of conductors include |
| A. | platinum |
| B. | sulphur |
| C. | phosphorus |
| D. | wood |
| Answer» B. sulphur | |
| 147. |
For an overhead power cable, preferable metal conductor is |
| A. | steel |
| B. | aluminum |
| C. | mercury |
| D. | graphite |
| Answer» C. mercury | |
| 148. |
Aqueous Sulfuric Acid (H₂SO₄(aq)) contains |
| A. | Hydrogen ions |
| B. | hydro oxide ions |
| C. | sulfate ions |
| D. | all of these |
| Answer» E. | |
| 149. |
Electrode is |
| A. | the substance which conducts electricity but remains unchanged chemically |
| B. | plate which carried electricity into the liquid |
| C. | a fully ionized liquid that undergoes electrolysis |
| D. | all of these |
| Answer» C. a fully ionized liquid that undergoes electrolysis | |
| 150. |
Non-electrolytes include |
| A. | Molten Sulphur |
| B. | Tetra chloromethane (CCl₄) |
| C. | Trichloromethane (CHCl₃) |
| D. | all of the above |
| Answer» E. | |