MCQOPTIONS
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MCQOPTIONS
This section includes 150 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Water of crystallization is found in |
| A. | Potassium chloride KCl |
| B. | Zinc Sulphate ZnSO₄ |
| C. | Copper Sulphate CuSO₄ |
| D. | Sodium Chloride NaCl |
| Answer» D. Sodium Chloride NaCl | |
| 52. |
Consider equation: Cu+2(aq) + 2OH-(aq) → Cu(OH)₂(s). precipitate of Copper Hydroxide (Cu(OH)₂) will be of |
| A. | green color |
| B. | blue color |
| C. | brown color |
| D. | white color |
| Answer» C. brown color | |
| 53. |
Consider reaction: CuO + H₂SO₄ → CuSO₄ + H₂O. salt is obtained through the |
| A. | crystallization |
| B. | fractional distillation |
| C. | vacuum distillation |
| D. | centrifugation |
| Answer» E. | |
| 54. |
Soluble salt is |
| A. | silver chloride AgCl |
| B. | Lead Chloride PbCl₂ |
| C. | Sodium chloride NaCl |
| D. | mercury chloride HgCl₂ |
| Answer» D. mercury chloride HgCl₂ | |
| 55. |
Consider equation: Ca+2 (aq) + 2OH- (aq) → Ca(OH)₂ (s). precipitate of calcium hydroxide will be of |
| A. | green color |
| B. | blue color |
| C. | brown color |
| D. | white color |
| Answer» E. | |
| 56. |
In order to test presence of nitrates, |
| A. | dilute HNO₃ shall be added |
| B. | dilute HCl shall be added |
| C. | dilute NaOH s + Aluminum powder shall be added |
| D. | dilute KOH with Al₂O₃ shall be added |
| Answer» D. dilute KOH with Al₂O₃ shall be added | |
| 57. |
Acid salt formed by Phosphoric acid and sodium phosphate is |
| A. | sodium hydrogen phosphate NaHPO₄ |
| B. | sodium dihydrogen phosphate NaH₂PO₄ |
| C. | sodium trihydrogen phosphate Na₂H₃PO₄ |
| D. | sodium tetrachloro phosphate NaCH₄Cl₄ |
| Answer» C. sodium trihydrogen phosphate Na₂H₃PO₄ | |
| 58. |
Chemical formula of Disodium Hydrogen Phosphate is |
| A. | Na₂HPO₄ |
| B. | Na₂H₃PO₃ |
| C. | Na₂HPO₄ |
| D. | Na₂H₃PO₄ |
| Answer» E. | |
| 59. |
In order to test presence of sulphates, |
| A. | dilute HNO₃ + Ba(NO₃)₂ shall be added |
| B. | dilute HCl shall be added |
| C. | dilute NaOH shall be added |
| D. | Diazo agent shall be used |
| Answer» B. dilute HCl shall be added | |
| 60. |
Number of acid salt formed by HCl is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 61. |
In the chemical equation, the symbol 'aq' represents |
| A. | aqueous only |
| B. | large amount of water only |
| C. | concentrated |
| D. | aqueous and large amount of water |
| Answer» E. | |
| 62. |
Electrons needed by a carbon atom to complete its outermost shell are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 63. |
Insoluble salts can be made by |
| A. | reaction of a metal and an acid |
| B. | reaction of a metal oxide and an acid |
| C. | reaction of a metal hydroxide and an acid |
| D. | ionic precipitation |
| Answer» E. | |
| 64. |
Acid salts are formed by |
| A. | Phosphoric acid |
| B. | Carbonic acid |
| C. | Sulphuric acid |
| D. | all of these |
| Answer» E. | |
| 65. |
CuO + H₂SO₄ → CuSO₄. other by product is |
| A. | water |
| B. | hydrogen gas |
| C. | oxygen gas |
| D. | Copper crystals |
| Answer» C. oxygen gas | |
| 66. |
While forming soluble salts, acid is added to metal until there is no more |
| A. | precipitation |
| B. | polymerization |
| C. | H₂ gas |
| D. | saturation |
| Answer» D. saturation | |
| 67. |
The attempt in ionic bond formation is to |
| A. | get rid of excess electrons |
| B. | attain configuration of noble gases |
| C. | avoid further reactions |
| D. | none of above |
| Answer» C. avoid further reactions | |
| 68. |
In magnesium oxide, the electronic configuration of magnesium is that of |
| A. | hydrogen(g) |
| B. | Helium(g) |
| C. | Neon(g) |
| D. | Argon(g) |
| Answer» D. Argon(g) | |
| 69. |
Sharing of outer electrons (e⁻) forms |
| A. | ionic bonds |
| B. | covalent bonds |
| C. | metallic bonding |
| D. | Co-ordinate bonding |
| Answer» C. metallic bonding | |
| 70. |
In order to test presence of carbonates (CO₃-2) |
| A. | dilute HNO₃ shall be added |
| B. | dilute HCl shall be added |
| C. | dilute NaOH shall be added |
| D. | dilute nitric acid is added accompanied by aluminum foil |
| Answer» C. dilute NaOH shall be added | |
| 71. |
Pairs of outer shell electrons not used in bonding are called as |
| A. | valence electrons |
| B. | loner electrons |
| C. | electrovalent electrons |
| D. | lone pairs |
| Answer» E. | |
| 72. |
In calcium chloride, Calcium looses |
| A. | one electron |
| B. | two electrons |
| C. | three electrons |
| D. | four electrons |
| Answer» C. three electrons | |
| 73. |
Hydrogen of acids is replaced by |
| A. | different metals |
| B. | different non-metals |
| C. | different gases |
| D. | all of the above |
| Answer» B. different non-metals | |
| 74. |
Metal oxides and acids can be reactants to form salts if |
| A. | the metals are transition |
| B. | the metals are at risk of sublimation |
| C. | the metals themselves do not react with acids |
| D. | all of these |
| Answer» D. all of these | |
| 75. |
Water has very low extent of |
| A. | ionization |
| B. | bonding |
| C. | temperature |
| D. | none of above |
| Answer» B. bonding | |
| 76. |
In order to get product of lead nitrate, lead oxide shall react with |
| A. | H₂SO₄ |
| B. | HNO₃ |
| C. | CH₃COOH |
| D. | H₂CO₃ |
| Answer» C. CH₃COOH | |
| 77. |
Insoluble salt is |
| A. | PbCl₂ |
| B. | HgCl₂ |
| C. | NaCl |
| D. | both a and b |
| Answer» E. | |
| 78. |
Copper Sulfate CuSO₄ is produced when reaction occurs between warm Sulfuric Acid (H₂SO₄) and |
| A. | Copper(s) (Cu) |
| B. | Copper Hydroxide (Cu(OH)₂) |
| C. | Copper Oxide (CuO) |
| D. | all of these |
| Answer» D. all of these | |
| 79. |
Titration is process to |
| A. | get salts by acids reacting with metals |
| B. | get salts by acids reacting with alkalis |
| C. | get salts by acids reacting with metal oxides |
| D. | all of these |
| Answer» C. get salts by acids reacting with metal oxides | |
| 80. |
In titration, end point is indicated through |
| A. | precipitation of salt |
| B. | crystallization of salt |
| C. | change in the color of solution |
| D. | a pink color |
| Answer» D. a pink color | |
| 81. |
Electrovalent bond is another name for |
| A. | covalent bond |
| B. | ionic bond |
| C. | co-ordinate bond |
| D. | metallic bond |
| Answer» C. co-ordinate bond | |
| 82. |
In ammonium ion, the electrons required between hydrogen ion and nitrogen ion are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 83. |
When ionic solid dissolves in water |
| A. | crystal lattice break |
| B. | ions depart |
| C. | water acidifies |
| D. | water turns alkaline |
| Answer» D. water turns alkaline | |
| 84. |
AlCl₃ converts to Al₂Cl₆ at |
| A. | high pressure |
| B. | low pressure |
| C. | high temperature |
| D. | low temperature |
| Answer» E. | |
| 85. |
The Group-II cations increase in ionic radius |
| A. | down the group |
| B. | across the period (left to right) |
| C. | across the period (right to left) |
| D. | up the group |
| Answer» B. across the period (left to right) | |
| 86. |
The process by which electrons spin and pair up against each other is called |
| A. | spin-pair repulsion |
| B. | pair-spin repulsion |
| C. | spin-repulsion |
| D. | paired-spin repulsion |
| Answer» B. pair-spin repulsion | |
| 87. |
If reactants are Calcium and Nitric acid, method of salt preparation will be |
| A. | metal + acid |
| B. | metal Oxide + acid |
| C. | metal hydroxide and acid |
| D. | metal carbonate and acid |
| Answer» B. metal Oxide + acid | |
| 88. |
Consider equation: Pb+2 (aq) + 2OH- (aq) → Pb(OH)₂ (s). precipitate of lead (II) hydroxide will be of |
| A. | green color |
| B. | blue color |
| C. | brown color |
| D. | white color |
| Answer» E. | |
| 89. |
In titration, color of indicator can be removed by |
| A. | not adding indicator in the beginning |
| B. | repeating the process again |
| C. | boiling the solution with some animal charcoal |
| D. | all of these |
| Answer» D. all of these | |
| 90. |
Intermolecular forces include |
| A. | van der Waal's forces |
| B. | permanent dipole-dipole forces |
| C. | hydrogen bonds |
| D. | all of above |
| Answer» E. | |
| 91. |
Chemical formula of sodium dihydrogen phosphate is |
| A. | NaH₂PO₃ |
| B. | NaH₂PO₄ |
| C. | Na₂H₂PO₄ |
| D. | Na₃H₂PO₄ |
| Answer» C. Na₂H₂PO₄ | |
| 92. |
People requiring an x-ray of stomach are given a porridge of |
| A. | PbSO₄ |
| B. | BaSO₄ |
| C. | Na₂CO₃ |
| D. | K₂CO₃ |
| Answer» C. Na₂CO₃ | |
| 93. |
If reactants are CuCO₃ + H₂SO₄, products will be |
| A. | CuSO₄ |
| B. | H₂O |
| C. | CO₂ |
| D. | all of these |
| Answer» E. | |
| 94. |
Consider equation: Fe+3(aq) + 3OH-(aq) → Fe(OH)₃(s). precipitate of Iron(III) Hydroxide will be of |
| A. | green color |
| B. | blue color |
| C. | brown color |
| D. | white color |
| Answer» D. white color | |
| 95. |
Soluble Carbonates (CO₃-2) are |
| A. | Na₂CO₃ |
| B. | K₂CO₃ |
| C. | (NH₄)₂CO₃ |
| D. | all of these |
| Answer» E. | |
| 96. |
In Al₂Cl₆ molecule, the ion pair of electrons are provided by |
| A. | Aluminum |
| B. | Chlorine |
| C. | Aluminum Chloride |
| D. | none of above |
| Answer» C. Aluminum Chloride | |
| 97. |
Under standard conditions the energy with enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions is |
| A. | bond energy |
| B. | crystal energy |
| C. | lattice energy |
| D. | structural energy |
| Answer» D. structural energy | |
| 98. |
Upon reaction of O₂ with metals of Period 3 elements, ionic bonds are formed if the |
| A. | electronegativity of Period 3 elements is more then 0.5 |
| B. | electronegativity of Period 3 elements is above 3.5 |
| C. | electronegativity of Period 3 elements is lower than 1.7 |
| D. | higher the difference in electronegativity of O₂ and Period 3 elements. |
| Answer» E. | |
| 99. |
The number of lobes in p-orbital is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 100. |
The lattice energy is always |
| A. | endothermic |
| B. | exothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» C. ectothermic | |