MCQOPTIONS
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MCQOPTIONS
This section includes 168 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Distilled water may also be called as |
| A. | immiscible |
| B. | solute |
| C. | solution |
| D. | distillate |
| Answer» E. | |
| 102. |
Presence of impurities in ethanol (C₂H₅OH) will cause |
| A. | lower the boiling point |
| B. | raise the boiling point |
| C. | the boiling at an exact temperature |
| D. | lower rate of evaporation |
| Answer» C. the boiling at an exact temperature | |
| 103. |
To filter HCL solution crucible is covered with |
| A. | tissue |
| B. | paper |
| C. | asbestos |
| D. | wax |
| Answer» D. wax | |
| 104. |
Solvent used for crystallization must be |
| A. | expensive |
| B. | inexpensie |
| C. | moderate |
| D. | low quality |
| Answer» C. moderate | |
| 105. |
Chromatography refers to the |
| A. | concentration of chromium in a substance |
| B. | mass of chromium |
| C. | testing of additives |
| D. | testing of the alkalinity or acidity |
| Answer» D. testing of the alkalinity or acidity | |
| 106. |
Crucible which is made up of porcelain is |
| A. | Gooch crucible |
| B. | sintered glass crucible |
| C. | clay crucible |
| D. | none of these |
| Answer» B. sintered glass crucible | |
| 107. |
Range of −5 oC to −25 oC is of |
| A. | depression of freezing point of ice |
| B. | latent heat of freezing |
| C. | melting salted ice |
| D. | melting pure ice |
| Answer» D. melting pure ice | |
| 108. |
While forming crystals, it is important to |
| A. | evaporate to dryness to get purest possible crystals |
| B. | attach the gas syringes to collect fumes |
| C. | not evaporate the water of crystallization |
| D. | use high flames |
| Answer» D. use high flames | |
| 109. |
Alternative techniques to crystallization involve |
| A. | decanting |
| B. | centrifuging |
| C. | filtration |
| D. | both a and b |
| Answer» E. | |
| 110. |
Medium used for filtration is |
| A. | Filter paper |
| B. | paper |
| C. | wax |
| D. | tissue paper |
| Answer» B. paper | |
| 111. |
Condensed solid produced during sublimation is |
| A. | crystals |
| B. | sublimate |
| C. | residue |
| D. | insoluble |
| Answer» C. residue | |
| 112. |
Example of drying agent is |
| A. | silicon dioxide |
| B. | acetic acid |
| C. | sulphuric acid |
| D. | phosphorus pentaoxide |
| Answer» E. | |
| 113. |
After centrifugation when sublimate settles, clear liquid |
| A. | can be allowed to rest |
| B. | can be allowed to form crystals |
| C. | can be decanted off |
| D. | can be evaporated |
| Answer» D. can be evaporated | |
| 114. |
Unit for volumes does not include |
| A. | ccm |
| B. | cdm |
| C. | liters |
| D. | tones |
| Answer» E. | |
| 115. |
Fresh sea water is referred to as impure because |
| A. | it contains only oxygen |
| B. | it contains aquatic animals |
| C. | it contains aquatic plants |
| D. | it contains dissolved salts |
| Answer» E. | |
| 116. |
Law of distribution in solvent extraction works irrespective of amount of |
| A. | solid |
| B. | solution |
| C. | solvent |
| D. | solute |
| Answer» E. | |
| 117. |
In chromatography, different pigments can be separated through |
| A. | solubility differences |
| B. | diffusion differences |
| C. | attraction among particles |
| D. | capillary action of the chromatography paper |
| Answer» B. diffusion differences | |
| 118. |
When hot molten liquid cools, |
| A. | the first crystals are the most pure |
| B. | impure substances may also form the crystals |
| C. | it turns into gas |
| D. | it turns into aqueous solution |
| Answer» B. impure substances may also form the crystals | |
| 119. |
Gases denser than air do not include |
| A. | chlorine |
| B. | carbon dioxide |
| C. | hydrogen chloride |
| D. | ammonia |
| Answer» E. | |
| 120. |
A solid that reappears from solution is called |
| A. | sublimate |
| B. | residue |
| C. | immiscible |
| D. | crystal |
| Answer» E. | |
| 121. |
Colored gas includes |
| A. | ammonia |
| B. | chlorine |
| C. | hydrogen chloride |
| D. | hydrogen |
| Answer» C. hydrogen chloride | |
| 122. |
Components which have small value of K have affinity for |
| A. | mobile phase |
| B. | stationary phase |
| C. | no phase |
| D. | solution |
| Answer» C. no phase | |
| 123. |
Crystals refers to |
| A. | a solid that can be dissolved in liquids |
| B. | a solid that re appears from other substances |
| C. | a solid that reappears from the solution |
| D. | can be obtained through sublimation |
| Answer» D. can be obtained through sublimation | |
| 124. |
Pure ice melts at exactly |
| A. | −100 °C |
| B. | zero °C |
| C. | 10 °C |
| D. | 20°C |
| Answer» C. 10 °C | |
| 125. |
A brine solution is |
| A. | low in salts |
| B. | concentrated in salts |
| C. | highly concentrated in salts |
| D. | contains a lot of water |
| Answer» D. contains a lot of water | |
| 126. |
An impure substance |
| A. | lowers the boiling point |
| B. | increases the boiling point |
| C. | lowers the melting point |
| D. | increases the melting point |
| Answer» D. increases the melting point | |
| 127. |
Solvent extraction is more good if repeated extractions are done using |
| A. | Large solvent |
| B. | small solvent |
| C. | extra solvent |
| D. | normal solvent |
| Answer» C. extra solvent | |
| 128. |
Gases heavier than air can be collected through |
| A. | upward delivery |
| B. | downward delivery |
| C. | downward displacement of air |
| D. | upwards displacement of air |
| Answer» C. downward displacement of air | |
| 129. |
Ether layer is used to separate |
| A. | fibres |
| B. | inorganic impurities |
| C. | organic impurities |
| D. | gases |
| Answer» D. gases | |
| 130. |
For crystallization we use solution that should be |
| A. | Saturated |
| B. | supersaturated |
| C. | dilute |
| D. | binary |
| Answer» B. supersaturated | |
| 131. |
Mobile phase can be |
| A. | gas or liquid |
| B. | solid or liquid |
| C. | only solid |
| D. | only gas |
| Answer» B. solid or liquid | |
| 132. |
Filter paper should fit tightly to provide |
| A. | Flow |
| B. | suction |
| C. | force |
| D. | pressure |
| Answer» C. force | |
| 133. |
Bigger crystals are yield by |
| A. | heating |
| B. | no cooling |
| C. | fast cooling |
| D. | slow cooling |
| Answer» E. | |
| 134. |
Filter paper must be folded |
| A. | five times |
| B. | four times |
| C. | thrice |
| D. | twice |
| Answer» E. | |
| 135. |
Distribution co efficient is related to |
| A. | decreasing factor |
| B. | colouring factor |
| C. | retardation factor |
| D. | separating factor |
| Answer» D. separating factor | |
| 136. |
Pore size of filter paper depends upon size of |
| A. | funnel |
| B. | medium |
| C. | precipitate |
| D. | solvent |
| Answer» D. solvent | |
| 137. |
Greek word from which chromatography is derived is |
| A. | chroma |
| B. | chroming |
| C. | cromatus |
| D. | Khromatos |
| Answer» E. | |
| 138. |
Stem of funnel should have length of few |
| A. | millimeters |
| B. | meters |
| C. | cm |
| D. | inches |
| Answer» E. | |
| 139. |
Whatmann filter paper used for paper chromatography is about |
| A. | 30 cm |
| B. | 20 cm |
| C. | 50 cm |
| D. | 35cm |
| Answer» C. 50 cm | |
| 140. |
Electronic thermometers |
| A. | are mercury in glass thermometer |
| B. | alcohol in glass thermometer |
| C. | are used to reduce the risk of mercury poisoning if broken |
| D. | are greatly replaced by alcohol in glass thermometer |
| Answer» D. are greatly replaced by alcohol in glass thermometer | |
| 141. |
To prepare fluted filter paper arrangement formed is |
| A. | fan like |
| B. | fish like |
| C. | star like |
| D. | flask like |
| Answer» B. fish like | |
| 142. |
Relative amounts of elements are discussed in |
| A. | Testing |
| B. | quantitative analysis |
| C. | Qualitative analysis |
| D. | Physical test |
| Answer» C. Qualitative analysis | |
| 143. |
Distillate formed after distillation is |
| A. | a diluted solution |
| B. | may contain impurities |
| C. | a condensed solution |
| D. | a concentrated solution |
| Answer» D. a concentrated solution | |
| 144. |
Type of crucibles used for filtration is usually |
| A. | two |
| B. | seven |
| C. | six |
| D. | five |
| Answer» C. six | |
| 145. |
Crystallization is used to |
| A. | purify sugar |
| B. | purify fertilizers |
| C. | separate salt from solution |
| D. | both a and b |
| Answer» E. | |
| 146. |
Fermented liquor can be purified and separated through |
| A. | simple distillation |
| B. | fractional distillation |
| C. | sublimation |
| D. | centrifugation |
| Answer» C. sublimation | |
| 147. |
Impurities, |
| A. | lower the boiling point |
| B. | lower the freezing point |
| C. | lower melting points |
| D. | raise the melting point |
| Answer» D. raise the melting point | |
| 148. |
If Ammonium Chloride (NH₄Cl) and Sodium Chloride (NaCl) are heated gently, |
| A. | ammonium salt becomes a gas |
| B. | gaseous ammonia will become solid on a glass funnel |
| C. | sodium chloride is left behind |
| D. | all of these |
| Answer» E. | |
| 149. |
Insoluble impurities from solution during crystallization are removed by |
| A. | drying |
| B. | filtration |
| C. | heating |
| D. | cooling |
| Answer» C. heating | |
| 150. |
Elevation of boiling points occur due to |
| A. | presence of impurities |
| B. | a reduced pressure |
| C. | a high pressure |
| D. | lower rate of evaporation |
| Answer» B. a reduced pressure | |