MCQOPTIONS
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MCQOPTIONS
This section includes 376 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Group-IV element that has the lowest bond energy is |
| A. | C-C Bond |
| B. | Si-Si Bond |
| C. | Ge-Ge Bond |
| D. | H-H Bond |
| Answer» D. H-H Bond | |
| 102. |
Decoy magnesium flares give off heat confuses the infrared detection system in missiles so the enemy can not |
| A. | focus the aircraft only |
| B. | target aircraft only |
| C. | lift the aircraft |
| D. | focus the aircraft and target the aircraft |
| Answer» E. | |
| 103. |
Elements of D-block are good conductors of |
| A. | heat only |
| B. | electricity only |
| C. | pressure |
| D. | heat and electricity |
| Answer» E. | |
| 104. |
The conductivity of electric current increases across metals of period 3 from sodium to |
| A. | potassium |
| B. | aluminum |
| C. | boron |
| D. | carbon |
| Answer» C. boron | |
| 105. |
Additional polymerization will have monomers with no repeating functional units in the actual chain which forms |
| A. | backbone |
| B. | products |
| C. | opposite groups |
| D. | reactants |
| Answer» B. products | |
| 106. |
Elements with giant molecular structures and strong covalent bonds include |
| A. | diamond |
| B. | silicon |
| C. | geranium |
| D. | all of above |
| Answer» E. | |
| 107. |
In Group IV, after Carbon, the highest melting point is of |
| A. | Tin (Sn) |
| B. | Lead (Pb) |
| C. | Silicon (Si) |
| D. | Germanium (Ge) |
| Answer» D. Germanium (Ge) | |
| 108. |
The metal ions and chloride ions are called |
| A. | hydrated ions |
| B. | metallic ions |
| C. | chloride ions |
| D. | non metallic ions |
| Answer» B. metallic ions | |
| 109. |
Chlorine reacts with cold hydroxides ions in a disproportionation reaction and results in |
| A. | lowering the acidity of soil |
| B. | killing the bacteria and germs in drinking water |
| C. | formation of commercial bleach |
| D. | none of above |
| Answer» D. none of above | |
| 110. |
As the metallic radii increases in Group-II, the melting point |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may vary |
| Answer» C. remains constant | |
| 111. |
The smallest element in Group-VII is |
| A. | iodine |
| B. | fluorine |
| C. | chlorine |
| D. | bromine |
| Answer» C. chlorine | |
| 112. |
In the carbonyl group, Oxygen atom has high electronegativity which makes it |
| A. | stable |
| B. | non-polar |
| C. | polarized |
| D. | unstable |
| Answer» D. unstable | |
| 113. |
The element of group IV which is metal is |
| A. | Carbon (C ) |
| B. | Germanium (Ge) |
| C. | Lead (Pb) |
| D. | Silicon (Si) |
| Answer» D. Silicon (Si) | |
| 114. |
Non-metal elements with diatomic molecules are from |
| A. | Group-II |
| B. | Group-IV |
| C. | Group-VII |
| D. | Group-III |
| Answer» D. Group-III | |
| 115. |
Volatile CFCs are used as |
| A. | aerosols |
| B. | propellants |
| C. | solvents |
| D. | all of above |
| Answer» E. | |
| 116. |
There is a decrease down the group in radius of |
| A. | atom only |
| B. | ion only |
| C. | nucleus |
| D. | atom and ion |
| Answer» E. | |
| 117. |
Hydrogen bromide have comparatively more resistant to decomposition than |
| A. | hydrogen iodide |
| B. | hydrogen fluoride |
| C. | hydrogen chloride |
| D. | none of above |
| Answer» B. hydrogen fluoride | |
| 118. |
Each transition element have more than one |
| A. | ion only |
| B. | oxidation state only |
| C. | nucleus |
| D. | ion and oxidation state |
| Answer» E. | |
| 119. |
Apple green flames are produced by the compounds of |
| A. | Strontium |
| B. | calcium |
| C. | barium |
| D. | beryllium |
| Answer» D. beryllium | |
| 120. |
Melting point of phenol is relatively high for an aryl compound because of the |
| A. | hydrogen bonding |
| B. | ionic bonding |
| C. | covalent bonding |
| D. | metallic bonding |
| Answer» B. ionic bonding | |
| 121. |
Going down the group, the colors of the halogens become |
| A. | natural |
| B. | darker |
| C. | lighter |
| D. | neutral |
| Answer» C. lighter | |
| 122. |
The lowest melting point among these elements is of |
| A. | Be |
| B. | Ca |
| C. | Sr |
| D. | Mg |
| Answer» D. Mg | |
| 123. |
The elements of group II are |
| A. | metals |
| B. | non-metals |
| C. | alkalis |
| D. | noble gases |
| Answer» B. non-metals | |
| 124. |
Processed foods, pickles, syrups and fruit juices are stored in |
| A. | SO₂ |
| B. | CO₂ |
| C. | NO |
| D. | NO₂ |
| Answer» B. CO₂ | |
| 125. |
The oxidation of primary alcohols give |
| A. | aldehydes |
| B. | ketones |
| C. | alcohols |
| D. | alkanes |
| Answer» B. ketones | |
| 126. |
The atomic radius of nickel is |
| A. | 0.115/nm |
| B. | 0.105/nm |
| C. | 0.117/nm |
| D. | 0.132/nm |
| Answer» B. 0.105/nm | |
| 127. |
Halogens dissolve well in |
| A. | pentane |
| B. | ethane |
| C. | cyclohexane |
| D. | water |
| Answer» D. water | |
| 128. |
The percentage of a sample of HBr decomposes at 430 °C. is |
| A. | 0.2 |
| B. | 0.1 |
| C. | 0.22 |
| D. | 0.11 |
| Answer» C. 0.22 | |
| 129. |
The volatility of the Halogens indicates the |
| A. | difficulty with which they react |
| B. | the ease with which they evaporate |
| C. | the density of the Halogens |
| D. | none of above |
| Answer» C. the density of the Halogens | |
| 130. |
Silicon is in the center of period 3 and has a structure of |
| A. | giant molecule |
| B. | smaller molecule |
| C. | medium molecule |
| D. | small electron |
| Answer» B. smaller molecule | |
| 131. |
Among period 3 elements, an element which has a higher electronegativity than others is |
| A. | chlorine |
| B. | argon |
| C. | sulfuric acid |
| D. | silicon |
| Answer» B. argon | |
| 132. |
In SN₂ mechanism 'S' stands for |
| A. | subordinate |
| B. | substitution |
| C. | sub-reaction |
| D. | systemic reaction |
| Answer» C. sub-reaction | |
| 133. |
Element of Group-IV, that is a metal is called |
| A. | Silicon (Si) |
| B. | Tin (Sn) |
| C. | Carbon (C ) |
| D. | Germanium (Ge) |
| Answer» C. Carbon (C ) | |
| 134. |
Which of these Halogens have lowest Melting Point? |
| A. | F₂ |
| B. | Cl₂ |
| C. | Br₂ |
| D. | I₂ |
| Answer» B. Cl₂ | |
| 135. |
HCl is mostly visible in the form of |
| A. | blue fumes |
| B. | white fumes |
| C. | grey fumes |
| D. | purple fumes |
| Answer» C. grey fumes | |
| 136. |
The outermost electrons in the elements of Group II are in |
| A. | d-orbital |
| B. | s-orbital |
| C. | p-orbital |
| D. | f-orbital |
| Answer» C. p-orbital | |
| 137. |
(Chloro Fluoro Carbons) CFCs are not |
| A. | flammable only |
| B. | toxic only |
| C. | harmful |
| D. | flammable and toxic |
| Answer» E. | |
| 138. |
The protection of earth from harmful rays of the sun is done by |
| A. | ozone layer |
| B. | UV rays |
| C. | stratosphere |
| D. | exosphere |
| Answer» B. UV rays | |
| 139. |
Number of electrons in valence shell of carbon is |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» E. | |
| 140. |
A precipitate will be formed if an unknown compound is added in dilute |
| A. | nitric acid only |
| B. | silver nitrate only |
| C. | sulfuric acid |
| D. | nitric acid and silver nitrate |
| Answer» E. | |
| 141. |
Halogen that has pale yellow color is |
| A. | F₂ |
| B. | Cl₂ |
| C. | Br₂ |
| D. | I₂ |
| Answer» B. Cl₂ | |
| 142. |
Higher oxidation states are generally found in compounds of |
| A. | oxygen and fluorine |
| B. | carbon and oxygen |
| C. | nitrogen and carbon |
| D. | oxygen and hydrogen |
| Answer» B. carbon and oxygen | |
| 143. |
Nitrates (-NO₃) of Group-II down the group require for their decomposition, is high in |
| A. | pressure |
| B. | temperature |
| C. | electricity |
| D. | altitude |
| Answer» C. electricity | |
| 144. |
Metal oxide that turns into cement upon roasting with clay is |
| A. | NO |
| B. | CaO |
| C. | BaO |
| D. | MgO |
| Answer» C. BaO | |
| 145. |
A gas which has a strong foul smell of bad eggs is |
| A. | hydrogen sulfide |
| B. | bromine |
| C. | chlorine |
| D. | methane |
| Answer» B. bromine | |
| 146. |
Oxides of group IV behave as |
| A. | acid |
| B. | base |
| C. | amphoteric |
| D. | alkalis |
| Answer» D. alkalis | |
| 147. |
The application of Law of Thermodynamics to the enthalpy changes was done by |
| A. | Newton |
| B. | Hess's |
| C. | Lewis |
| D. | Sophocles |
| Answer» C. Lewis | |
| 148. |
Sulfur dioxide is added to foods to stop |
| A. | oxidation of fats only |
| B. | over ripening only |
| C. | reduction of sugars |
| D. | oxidation of fats and over ripening |
| Answer» E. | |
| 149. |
Gases do not obey ideal gas equation at |
| A. | low temperature only |
| B. | high pressure only |
| C. | high temperature |
| D. | low temperature and high pressure |
| Answer» E. | |
| 150. |
Products manufactured by using phenol as their staring material includes |
| A. | compact discs |
| B. | TCP antiseptics |
| C. | araldite adhesive |
| D. | all of above |
| Answer» E. | |