MCQOPTIONS
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MCQOPTIONS
This section includes 265 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
If the proportion of particles with energy is greater than activation energy, the reaction will |
| A. | slow down |
| B. | speed up |
| C. | remains constant |
| D. | end up |
| Answer» B. speed up | |
| 102. |
The alternative mechanism by which particles react possesses a lower |
| A. | activation energy |
| B. | chemical energy |
| C. | speed |
| D. | reaction |
| Answer» B. chemical energy | |
| 103. |
A nucleophile is considered as |
| A. | acceptor |
| B. | donator |
| C. | mutual share |
| D. | spectator |
| Answer» C. mutual share | |
| 104. |
Transmission of light through mixture is measured by |
| A. | spectrometer |
| B. | calorimeter |
| C. | colorimeter |
| D. | none of above |
| Answer» D. none of above | |
| 105. |
Consider the reaction: S(s) + O₂(g) → SO₂. If oxidation is allowed to continue, the product formed is |
| A. | SO₂ (g) |
| B. | SO₃(g) |
| C. | S₂O₃(s) |
| D. | S₂O₄(aq) |
| Answer» C. S₂O₃(s) | |
| 106. |
Halogen that has the lowest electronegativity is |
| A. | Bromine (Br₂) |
| B. | Chlorine (Cl₂) |
| C. | Iodine (I₂) |
| D. | Fluorine (F₂) |
| Answer» D. Fluorine (F₂) | |
| 107. |
The order of the reaction is the power to which concentration of reactant is |
| A. | lowered |
| B. | raised |
| C. | stopped |
| D. | constant |
| Answer» C. stopped | |
| 108. |
Covalent bonds can be broken by |
| A. | homolytic fission only |
| B. | heterolysis fission only |
| C. | homolytic fusion |
| D. | homolytic and heterolysis fission |
| Answer» E. | |
| 109. |
The bond breaking in which the atoms at each end of bond is left with one electron (e⁻) from the pair forming covalent bond is |
| A. | homolytic fission |
| B. | heterolytic fission |
| C. | homolytic fusion |
| D. | heterolytic fusion |
| Answer» B. heterolytic fission | |
| 110. |
As we go down the Group-II, metals become |
| A. | more reactive |
| B. | less reactive |
| C. | non-reactive |
| D. | hyperactive |
| Answer» B. less reactive | |
| 111. |
The units of solubility depend upon number and type of |
| A. | ion |
| B. | atoms |
| C. | moles |
| D. | molecules |
| Answer» B. atoms | |
| 112. |
Fluorine (F₂) can be stored in containers of |
| A. | glass |
| B. | metals |
| C. | both of these |
| D. | none of above |
| Answer» E. | |
| 113. |
After Fluorine (F₂), a halogen that has the higher electronegativity is |
| A. | I |
| B. | F |
| C. | Br |
| D. | Cl |
| Answer» E. | |
| 114. |
If Mg(s) is allowed to react with H₂O(l), the product other than H₂(g) will be |
| A. | MgO(s) |
| B. | MgO(aq) |
| C. | Mg(OH)₂ (aq) |
| D. | Mg₂O₃(s) |
| Answer» D. Mg₂O₃(s) | |
| 115. |
The occurrence of three species at the same time is unlikely to be found because they will |
| A. | collide |
| B. | attract |
| C. | react |
| D. | repel |
| Answer» B. attract | |
| 116. |
The Group-II elements are metals which form |
| A. | ionic compounds |
| B. | covalent compounds |
| C. | metallic compounds |
| D. | dative compounds |
| Answer» B. covalent compounds | |
| 117. |
Consider the reaction: CaO(s) + H₂O(l) → Ca(OH)₂. The state of the product in this reaction should be |
| A. | solid |
| B. | liquid |
| C. | aqueous |
| D. | Gaseous |
| Answer» B. liquid | |
| 118. |
When an electron enters into the outermost shell of fluorine, it experiences |
| A. | least shielding from the positive nuclear charge |
| B. | most shielding from the positive nuclear charge |
| C. | least shielding from the negative nuclear charge |
| D. | most shielding from the negative nuclear charge |
| Answer» B. most shielding from the positive nuclear charge | |
| 119. |
1 mol of a hydrated salt is obtained from 1 mol of |
| A. | hydrated solvent |
| B. | hydrated solute |
| C. | anhydrous salt |
| D. | none of above |
| Answer» D. none of above | |
| 120. |
The position of equilibrium explains the amounts of |
| A. | products only |
| B. | reactants only |
| C. | catalyst |
| D. | products and reactants |
| Answer» E. | |
| 121. |
An increase in the nuclear charge down the Group II |
| A. | makes the loss of outer electrons possible |
| B. | shielding effect decreases |
| C. | distance from the outer electrons increases |
| D. | none of above |
| Answer» C. distance from the outer electrons increases | |
| 122. |
In concentration of gases, the molecules are further apart due to the decrease in |
| A. | volume |
| B. | pressure |
| C. | density |
| D. | inert |
| Answer» C. density | |
| 123. |
The increase in the rate of reaction due to the increase in temperature is due to |
| A. | increased energy only |
| B. | successful collision only |
| C. | elastic collisions |
| D. | increased energy and successful collisions |
| Answer» E. | |
| 124. |
Consider the reaction: SiCl₄(l) + H₂O(l) → SiO₂ (s) + HCl. Moles of HCl produced after balancing the equation is |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 125. |
What is correct about halogens? |
| A. | they loose one electron while reacting with metal atoms |
| B. | they are oxidizing agents |
| C. | they are reducing agents |
| D. | they are least volatile of all other elements |
| Answer» C. they are reducing agents | |
| 126. |
Propan-2-ol will get oxidized to give |
| A. | aldehyde |
| B. | ketone |
| C. | alcohol |
| D. | carbonyl |
| Answer» C. alcohol | |
| 127. |
During a reaction, the formation of the mirror inside the tube is due to |
| A. | silver ions |
| B. | silver atoms |
| C. | silver compounds |
| D. | silver nitrate |
| Answer» C. silver compounds | |
| 128. |
Eo Values provides information that |
| A. | reaction is possible only |
| B. | reverse reaction does not occur only |
| C. | reaction will not proceed |
| D. | reaction is possible and reverse reaction does not occur |
| Answer» E. | |
| 129. |
Alcohols react with oxygen to form |
| A. | water |
| B. | carbon dioxide |
| C. | carbon monoxide |
| D. | carbon trioxide |
| Answer» D. carbon trioxide | |
| 130. |
The standard enthalpy change information of any element in the standard state is |
| A. | unit |
| B. | zero |
| C. | stable |
| D. | unstable |
| Answer» C. stable | |
| 131. |
Consider the reaction: S(s) + O₂(g) → SO₂. The state of SO₂ in this reaction is |
| A. | liquid |
| B. | solid |
| C. | gaseous |
| D. | semi solid |
| Answer» D. semi solid | |
| 132. |
In equilibrium state, the backward and forward reactions take place at |
| A. | same time |
| B. | simultaneously |
| C. | one time |
| D. | all of above |
| Answer» E. | |
| 133. |
A substance which increases the rate of reaction but itself remain chemically unchanged is called a |
| A. | substrate |
| B. | enzyme |
| C. | reactant |
| D. | product |
| Answer» C. reactant | |
| 134. |
Carbon monoxide (CO) poisoning can cause which of the following in a person. |
| A. | dizziness only |
| B. | unconsciousness only |
| C. | heart attack |
| D. | dizziness and unconsciousness |
| Answer» E. | |
| 135. |
The change in color of the particular reactant can be detected in |
| A. | spectrometer |
| B. | calorimeter |
| C. | colorimeter |
| D. | none of above |
| Answer» D. none of above | |
| 136. |
Upon the reaction between PCl₅(l) and H₂O(l), the products include an acid and |
| A. | HPO₃ (aq) |
| B. | H₂PO₂ (aq) |
| C. | H₃PO₄ (aq) |
| D. | H₂PO₄ |
| Answer» D. H₂PO₄ | |
| 137. |
Order of reaction can be identified by plotting graphs of |
| A. | reaction only |
| B. | concentration only |
| C. | pH value |
| D. | reaction and concentration |
| Answer» E. | |
| 138. |
Down the Halogen Group (Group-VII), the reactivity |
| A. | increases |
| B. | decreases |
| C. | becomes zero |
| D. | constant |
| Answer» C. becomes zero | |
| 139. |
Reactions with a mechanism involving trimolecular step are |
| A. | common |
| B. | rare |
| C. | profound |
| D. | general |
| Answer» C. profound | |
| 140. |
Free radical substitution is the over all reaction alkanes (saturated hydrocarbons) and halogens (Group-VII elements) involving |
| A. | initiation step |
| B. | propagation step |
| C. | termination step |
| D. | all of above |
| Answer» E. | |
| 141. |
Alkane molecules are not attacked by electrophiles or neutrophils because they are |
| A. | polar |
| B. | non-polar |
| C. | volatile |
| D. | unstable |
| Answer» C. volatile | |
| 142. |
Ultra-fast laser technique was first used by |
| A. | Ahmed Zewail |
| B. | Fredrick Ostwald |
| C. | Bin-e-Al-Haytham |
| D. | Ahmed Farabi |
| Answer» B. Fredrick Ostwald | |
| 143. |
The rate-determining step containing single specie (atom, ion or molecule) will make reaction |
| A. | molecular |
| B. | unimolecular |
| C. | polymolecular |
| D. | multimolecular |
| Answer» C. polymolecular | |
| 144. |
Consider the reaction: P(s) + O₂(g) → P₄O₁₀(s). Moles of P(s) needed to balance the equation are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 145. |
Oxidation of chloride ions (Cl⁻) to chlorine (Cl₂) is done by |
| A. | nitric acid |
| B. | acidified MnO₄⁻ |
| C. | sulfuric acid |
| D. | acidified ClO₂⁻³ |
| Answer» C. sulfuric acid | |
| 146. |
Free radicals are not produced in the step of |
| A. | initiation step |
| B. | propagation step |
| C. | termination step |
| D. | none of above |
| Answer» D. none of above | |
| 147. |
As electrons acceptors, strongest halogen is |
| A. | F |
| B. | Cl |
| C. | Br |
| D. | I |
| Answer» B. Cl | |
| 148. |
CaCl₂ is an example of |
| A. | Ionic bond |
| B. | Covalent bond |
| C. | Metallic bond |
| D. | Dative bond |
| Answer» B. Covalent bond | |
| 149. |
Hydrogenation of alkenes in margarine manufacturing requires catalyst of |
| A. | vanadium oxide |
| B. | iron |
| C. | platinum |
| D. | nickel |
| Answer» E. | |
| 150. |
Nitric Acid (HNO₃) manufacturing requires catalyst of |
| A. | vanadium oxide |
| B. | iron |
| C. | platinum |
| D. | nickel |
| Answer» D. nickel | |