MCQOPTIONS
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MCQOPTIONS
This section includes 255 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Formula of Nitric Acid is |
| A. | H(NO₃)₂ |
| B. | HNO₂ |
| C. | HNO₃ |
| D. | H₂NO₄ |
| Answer» D. H₂NO₄ | |
| 102. |
Chemical formula of anhydrous Monosodium Phosphate is |
| A. | NaPO₃ |
| B. | NaH₂PO₄ |
| C. | Na₂CO₃.10H₂O |
| D. | NaH₂PO₄.H₂O |
| Answer» C. Na₂CO₃.10H₂O | |
| 103. |
Valency is also referred to as |
| A. | the combining power |
| B. | the volatility |
| C. | the rigidity |
| D. | the number of electron shells |
| Answer» B. the volatility | |
| 104. |
Formula of Zinc Chloride (ZnCl₂) indicates that charge on Zinc ion (Zn+2) is |
| A. | +1 |
| B. | +2 |
| C. | −1 |
| D. | −2 |
| Answer» C. −1 | |
| 105. |
Chemical formula of butane is |
| A. | CH₄ |
| B. | C₂H₄ |
| C. | C₃H₈ |
| D. | C₄H₁₀ |
| Answer» E. | |
| 106. |
Stannum is Latin name of |
| A. | Tin |
| B. | Sulphur |
| C. | Sodium |
| D. | Nickel |
| Answer» B. Sulphur | |
| 107. |
Haber process is carried out to synthesize |
| A. | ammonia |
| B. | sulfuric acid |
| C. | hydrochloric acid |
| D. | nitrous acid |
| Answer» B. sulfuric acid | |
| 108. |
Na₂SO₄ stands for |
| A. | ammonium sulphate |
| B. | sodium sulphite |
| C. | sodium sulphate |
| D. | sodium monosulphate oxidate |
| Answer» D. sodium monosulphate oxidate | |
| 109. |
In Na₂CO₃, relative atomic mass of sodium is |
| A. | 23 |
| B. | 46 |
| C. | 48 |
| D. | 58 |
| Answer» C. 48 | |
| 110. |
Equilibrium reactions are found in large scale in the production of |
| A. | ammonia only |
| B. | sulfuric acid only |
| C. | lactic acid |
| D. | ammonia and sulfuric acid |
| Answer» E. | |
| 111. |
Butane (C₄H₁₀)molecular weight is |
| A. | 58.122g/mol |
| B. | 63.71g/mol |
| C. | 55.12g/mol |
| D. | 51.19g/mol |
| Answer» B. 63.71g/mol | |
| 112. |
Alcohol (CₙH₂ₙ₊₁OH) with lowest molecular mass at room temperature is |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | vapor |
| Answer» C. gas | |
| 113. |
Chemical formula of aluminum nitrate is |
| A. | AlNi₃ |
| B. | Al₃Ni₂ |
| C. | Al(NO₂)₃ |
| D. | Al(NO₃)₃ |
| Answer» E. | |
| 114. |
NH₄ has |
| A. | positive charge |
| B. | double positive charge |
| C. | negative charge |
| D. | double negative charge |
| Answer» B. double positive charge | |
| 115. |
Expression of ratio of combining number of atoms or ions is called as |
| A. | valency |
| B. | exponential notation |
| C. | formula |
| D. | isotopic charges |
| Answer» D. isotopic charges | |
| 116. |
Acids are always |
| A. | solid crystals |
| B. | aqueous |
| C. | gases |
| D. | liquid |
| Answer» C. gases | |
| 117. |
Molar mass of Calcium Carbonate CaCO₃ is |
| A. | 100.0869 g/mol |
| B. | 99.0154g/mol |
| C. | 110.018g/mol |
| D. | 101.087g/mol |
| Answer» B. 99.0154g/mol | |
| 118. |
In one molecule of Sulfuric Acid (H₂SO₄), |
| A. | one ion of hydrogen combines with one ion of sulphate |
| B. | two ions of sulphate combine with one ion of hydrogen |
| C. | two ions of hydrogen combine with one ion of sulphate |
| D. | two ions of hydrogen combine with two ions of sulphate |
| Answer» D. two ions of hydrogen combine with two ions of sulphate | |
| 119. |
While calculating empirical formula, simplest ratio is obtained by dividing |
| A. | the smallest number |
| B. | the largest number |
| C. | the relative atomic mass |
| D. | the relative mass of a covalent compound |
| Answer» B. the largest number | |
| 120. |
To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of HNO₃ molecules required will be |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 121. |
In additional polymerization, unsaturated monomers contain |
| A. | single bond |
| B. | double bond |
| C. | triple bond |
| D. | quadrant bond |
| Answer» C. triple bond | |
| 122. |
Valency of all these ions is -2, except |
| A. | SO₄ |
| B. | SO₃ |
| C. | CO₃ |
| D. | HCO₃ |
| Answer» E. | |
| 123. |
When magnesium ions (Mg+2) react with Nitric acid (HNO₃), resulting Magnesium Nitrate (Mg(NO₃)₂) will be |
| A. | solid |
| B. | liquid |
| C. | aqueous |
| D. | gas |
| Answer» D. gas | |
| 124. |
Radical refers to a |
| A. | positive valency |
| B. | negative valency |
| C. | group of atoms |
| D. | numbers of electron shells |
| Answer» D. numbers of electron shells | |
| 125. |
Formula Al(NO₃)₃ indicates that |
| A. | three molecules of aluminum are combined with three molecules of Nitrogen oxide |
| B. | three molecules of aluminum are combined with three molecules of Nitrate ion |
| C. | one molecules of aluminum is combined with three molecules of Nitrate ion |
| D. | one molecules of aluminum is combined with one molecules of Nitrate ion |
| Answer» D. one molecules of aluminum is combined with one molecules of Nitrate ion | |
| 126. |
If waters relative molecular mass is 36, molecular formula will turn out to be |
| A. | H₂O |
| B. | H₂O₂ |
| C. | H₂O₄ |
| D. | H₈O₄ |
| Answer» D. H₈O₄ | |
| 127. |
Ions remaining unchanged in both reactants and products are called as |
| A. | residual ions |
| B. | sublimates |
| C. | spectator ions |
| D. | radical ions |
| Answer» D. radical ions | |
| 128. |
One molecule each of Magnesium Chloride (MgCl₂), Water (H₂O) and Carbon dioxide (CO₂) results if reactants are |
| A. | MgCO₃ and HCl |
| B. | MgCO₃ and 2HCl |
| C. | MgHCO₃ and HCl |
| D. | MgHCO₃ and 2HCl |
| Answer» C. MgHCO₃ and HCl | |
| 129. |
If valency of both Calcium and Sulphate ion is 2, formula of calcium sulphate will be |
| A. | CaSO₃ |
| B. | CaSO₄ |
| C. | Ca₂(SO₄)2 |
| D. | Ca₂SO₄ |
| Answer» C. Ca₂(SO₄)2 | |
| 130. |
The formula of an ionic compound by rule is always its |
| A. | molecular formula |
| B. | empirical formula |
| C. | structural formula |
| D. | model |
| Answer» C. structural formula | |
| 131. |
Vanillin is used to give flavor in |
| A. | ice-cream |
| B. | chocolate |
| C. | frozen yogurt |
| D. | sweets |
| Answer» D. sweets | |
| 132. |
The ions which do not take part in any activity step during a chemical reaction are called |
| A. | positive ions |
| B. | negative ions |
| C. | neutral ions |
| D. | spectators ions |
| Answer» E. | |
| 133. |
The mass of each element in a compound helps in determining |
| A. | empirical formula |
| B. | molecular formula |
| C. | structural formula |
| D. | model |
| Answer» B. molecular formula | |
| 134. |
During a chemical reaction, atoms can not be |
| A. | created only |
| B. | destroyed only |
| C. | converted |
| D. | created and destroyed |
| Answer» E. | |
| 135. |
Relative molecular masses can be calculated |
| A. | by the relative atomic mass |
| B. | by the relative mass of a covalent compound |
| C. | if individual relative atomic masses are added |
| D. | by adding relative compound masses |
| Answer» D. by adding relative compound masses | |
| 136. |
Molar mass of (NH₄)₂SO₄ is |
| A. | 113.19g/mol |
| B. | 124.21g/mol |
| C. | 141.39g/mol |
| D. | 132.139 g/mol |
| Answer» E. | |
| 137. |
Valency of Phosphate ion PO₄ is |
| A. | -1 |
| B. | -2 |
| C. | -3 |
| D. | -4 |
| Answer» D. -4 | |
| 138. |
The formation of a single product from two reactant molecules is known as |
| A. | addition reaction |
| B. | elimination reaction |
| C. | substitution reaction |
| D. | oxidation |
| Answer» B. elimination reaction | |
| 139. |
The molecular formula of different compounds shows actual numbers of |
| A. | atoms |
| B. | molecules |
| C. | moles |
| D. | ions |
| Answer» B. molecules | |
| 140. |
Molar mass of urea NH₂CONH₂ is |
| A. | 59.51g/mol |
| B. | 55.89g/mol |
| C. | 60.055 g/mol |
| D. | 65.32g/mol |
| Answer» D. 65.32g/mol | |
| 141. |
Spectator ions, |
| A. | take active part in forming new products |
| B. | remain chemically unchanged in an ionic equation |
| C. | act as catalysts |
| D. | form suspensions in the liquid |
| Answer» C. act as catalysts | |
| 142. |
Consider Calcium Carbonate (CaCO₃) and Hydrochloric Acid (HCl) as reactants, molecules of Hydrochloric Acid (HCl) required to balance equation will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 143. |
Amino acids react to form peptides and proteins, this process is known as |
| A. | addition polymerization |
| B. | substitution polymerization |
| C. | condensation polymerization |
| D. | hydration polymerization |
| Answer» D. hydration polymerization | |
| 144. |
On reduction of 798g of iron oxide by profound carbon monoxide, will release a mass of iron equal to |
| A. | 558g |
| B. | 588g |
| C. | 575g |
| D. | 585g |
| Answer» B. 588g | |
| 145. |
The representation of a chemical reaction in shorthand way is via a |
| A. | symbol equation |
| B. | formula |
| C. | covalent bonds |
| D. | word equation |
| Answer» B. formula | |
| 146. |
Consider chemical reaction ZnCO₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of HNO₃ molecules required for a balanced equation will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 147. |
In Copper Oxide (Cu₂O), charge on Copper (Cu) is |
| A. | +1 |
| B. | +2 |
| C. | −1 |
| D. | −2 |
| Answer» B. +2 | |
| 148. |
The general formula for alkanes is |
| A. | CₙH₂ₙ |
| B. | CₙH₂ₙ₊₂ |
| C. | CₙH |
| D. | CH₂ₙ |
| Answer» B. CₙH₂ₙ₊₂ | |
| 149. |
When two aqueous solutions react together to give off solid product, this reaction is known as |
| A. | precipitation reaction |
| B. | oxidation |
| C. | reduction |
| D. | redox reaction |
| Answer» B. oxidation | |
| 150. |
There is often a difference in the empirical and molecular formula of |
| A. | ionic compounds |
| B. | inorganic molecules |
| C. | organic molecules |
| D. | co-ordinate compounds |
| Answer» D. co-ordinate compounds | |