MCQOPTIONS
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MCQOPTIONS
This section includes 229 Mcqs, each offering curated multiple-choice questions to sharpen your Grade9 knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A mole of any substance contains |
| A. | 6.022 * 1022 particles |
| B. | 6.022 * 1023 particles |
| C. | 6.022 * 1024 particles |
| D. | 6.022 * 1025 particles |
| Answer» C. 6.022 * 1024 particles | |
| 52. |
The mass number of an atom is |
| A. | number of protons only |
| B. | number of neutrons only |
| C. | number of electrons |
| D. | number of protons and neutrons |
| Answer» E. | |
| 53. |
Biochemistry deals with |
| A. | physical changes in living organisms only |
| B. | chemical changes in living organisms only |
| C. | genetically changes in living organisms |
| D. | physical and chemical changes in living organisms |
| Answer» E. | |
| 54. |
Ca on losing 2 electrons becomes |
| A. | Ca-2 |
| B. | Ca-1 |
| C. | Ca+2 |
| D. | Ca-2 |
| Answer» D. Ca-2 | |
| 55. |
If 9.05 moles of ozone is formed in a storm then the mass of ozone is |
| A. | 435g |
| B. | 450g |
| C. | 434.4g |
| D. | 480g |
| Answer» D. 480g | |
| 56. |
The formula which gives the simplest whole-number ratio of atoms is |
| A. | empirical formula |
| B. | molecular formula |
| C. | chemical formula |
| D. | actual formula |
| Answer» B. molecular formula | |
| 57. |
The matter is anything that occupies |
| A. | space only |
| B. | mass only |
| C. | time |
| D. | space and mass |
| Answer» E. | |
| 58. |
The mass of 1 mole of sucrose is |
| A. | 320g |
| B. | 342g |
| C. | 341g |
| D. | 340g |
| Answer» C. 341g | |
| 59. |
The branch of chemistry which deals with a substance containing carbon is called |
| A. | carbon chemistry |
| B. | inorganic chemistry |
| C. | organic chemistry |
| D. | environmental chemistry |
| Answer» D. environmental chemistry | |
| 60. |
The number of atoms in 5 moles of nitrogen atom is |
| A. | 3.01 * 1024 |
| B. | 4.1 * 1030 |
| C. | 3.9 * 1032 |
| D. | 5 * 1056 |
| Answer» B. 4.1 * 1030 | |
| 61. |
The solubility of Na2SO4 |
| A. | increases with increase in temperature |
| B. | decreases with increase in temperature |
| C. | no effect on solubility with change in temperature |
| D. | none of above |
| Answer» C. no effect on solubility with change in temperature | |
| 62. |
Solutions that contain solid solutes in liquid solvents are called |
| A. | liquids in solids |
| B. | solids in liquids |
| C. | solids in solids |
| D. | solids in gas |
| Answer» C. solids in solids | |
| 63. |
When NaCl is dissolved in water, the negative end of water molecules is attracted towards |
| A. | Cl |
| B. | H |
| C. | He |
| D. | Na |
| Answer» E. | |
| 64. |
Colloids can |
| A. | scatter light |
| B. | not scatter light |
| C. | absorb heat |
| D. | evolve heat |
| Answer» B. not scatter light | |
| 65. |
The concentration of the solution is the quantity of |
| A. | solvent in solute |
| B. | solute in given solvent |
| C. | gas dissolved in liquid |
| D. | none of above |
| Answer» C. gas dissolved in liquid | |
| 66. |
By losing one or two electrons the atoms of metal are |
| A. | oxidized |
| B. | reduced |
| C. | hydrogenated |
| D. | sublimated |
| Answer» B. reduced | |
| 67. |
A reactant containing the element that is oxidized is called |
| A. | reducing agent |
| B. | oxidizing agent |
| C. | hydrogen |
| D. | sublime |
| Answer» B. oxidizing agent | |
| 68. |
Electrolysis of brine produces |
| A. | chlorine gas |
| B. | hydrogen gas |
| C. | sodium hydroxide |
| D. | all of above |
| Answer» E. | |
| 69. |
When zinc is plated on steel, the anode is made up of |
| A. | steel |
| B. | oxygen |
| C. | zinc |
| D. | carbon |
| Answer» D. carbon | |
| 70. |
Galvanic cells are also named as |
| A. | electrolytic cells |
| B. | battery cells |
| C. | Daniel cells |
| D. | John cells |
| Answer» D. John cells | |
| 71. |
Species present in a substance refers to |
| A. | atoms |
| B. | ions |
| C. | molecules |
| D. | representative particles |
| Answer» E. | |
| 72. |
The formula mass of NaCl is |
| A. | 57.5 amu |
| B. | 58.5 amu |
| C. | 59.5 amu |
| D. | 60.0 amu |
| Answer» C. 59.5 amu | |
| 73. |
In glucose the simplest ratio between C, H and O is |
| A. | 0.0840625 |
| B. | 0.126400463 |
| C. | 0.04306713 |
| D. | 0.127789352 |
| Answer» D. 0.127789352 | |
| 74. |
Gram molecular mass of C6H12O6 is |
| A. | 18.016g |
| B. | 180.096g |
| C. | 58.5g |
| D. | 70g |
| Answer» C. 58.5g | |
| 75. |
An ionic compound is electrically |
| A. | neutral |
| B. | positively charged |
| C. | negatively charged |
| D. | none of above |
| Answer» B. positively charged | |
| 76. |
As we move across the period the basic character of oxides |
| A. | increases |
| B. | remains same |
| C. | decreases |
| D. | becomes zero |
| Answer» D. becomes zero | |
| 77. |
Boron is a |
| A. | metal |
| B. | metalloid |
| C. | non-metal |
| D. | gas |
| Answer» C. non-metal | |
| 78. |
Metallic oxides are |
| A. | basic in nature |
| B. | acidic in nature |
| C. | slightly acidic in nature |
| D. | neutral |
| Answer» B. acidic in nature | |
| 79. |
Protium has |
| A. | one neutron |
| B. | two neutrons |
| C. | no neutron |
| D. | 3 neutrons |
| Answer» D. 3 neutrons | |
| 80. |
Chlorine-35 exists in nature about |
| A. | 0.35 |
| B. | 0.4 |
| C. | 0.5 |
| D. | 0.75 |
| Answer» E. | |
| 81. |
D sub-shell can accommodate maximum |
| A. | 2 electrons |
| B. | 10 electrons |
| C. | 14 electrons |
| D. | 6 electrons |
| Answer» C. 14 electrons | |
| 82. |
When Uranium-238 emits α particles it decays in to |
| A. | Helium |
| B. | Carbon |
| C. | Thorium-234 |
| D. | Uranium-235 |
| Answer» D. Uranium-235 | |
| 83. |
The lowest energy orbital among the following is |
| A. | 2s |
| B. | 2p |
| C. | 3s |
| D. | 3p |
| Answer» B. 2p | |
| 84. |
The decrease in the force of attraction between valence electrons and nucleus by inner electrons is called |
| A. | screening effect |
| B. | shielding effect |
| C. | photoelectric effect |
| D. | dopler effect |
| Answer» C. photoelectric effect | |
| 85. |
Elements are arranged in order of |
| A. | decreasing atomic number |
| B. | decreasing atomic mass |
| C. | increasing atomic number |
| D. | increasing atomic mass |
| Answer» D. increasing atomic mass | |
| 86. |
As we go from left to right across the period, the electron affinity |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | all of above |
| Answer» B. decreases | |
| 87. |
Elements that lie in the same column have |
| A. | similar properties |
| B. | different properties |
| C. | same physical properties |
| D. | different chemical properties |
| Answer» B. different properties | |
| 88. |
Physical properties depend on the |
| A. | size of atom |
| B. | size of proton |
| C. | size of neutron |
| D. | no. of electrons |
| Answer» B. size of proton | |
| 89. |
Non-metals are poor conductors of |
| A. | heat only |
| B. | electricity only |
| C. | temperature |
| D. | heat and electricity |
| Answer» E. | |
| 90. |
The tendency of a metal to lose electron is called |
| A. | electronegativity |
| B. | electro positivity |
| C. | electroplating |
| D. | electrolysis |
| Answer» C. electroplating | |
| 91. |
The most acidic among the following is |
| A. | HF |
| B. | HCl |
| C. | HBr |
| D. | HI |
| Answer» E. | |
| 92. |
Halogens react with metals to form |
| A. | Halides |
| B. | oxides |
| C. | halogen compounds |
| D. | hydrogenated compounds |
| Answer» B. oxides | |
| 93. |
The oxide of aluminum is |
| A. | acidic |
| B. | basic |
| C. | neutral |
| D. | amphoteric |
| Answer» E. | |
| 94. |
If the liquid is heated to increase the kinetic energy then the liquid will |
| A. | evaporate slowly |
| B. | evaporate faster |
| C. | not evaporate |
| D. | boil |
| Answer» C. not evaporate | |
| 95. |
The melting and freezing of a substance occurs as |
| A. | same temperature |
| B. | more than melting point |
| C. | more than freezing point |
| D. | less than boiling point |
| Answer» B. more than melting point | |
| 96. |
The barometer is invented by |
| A. | Galileo |
| B. | Robert Boyle |
| C. | Charles |
| D. | Torricelli |
| Answer» E. | |
| 97. |
At Mount Everest, the water boils at |
| A. | 100 °C |
| B. | 90 °C |
| C. | 80 °C |
| D. | 70 °C |
| Answer» E. | |
| 98. |
The movement of molecules from higher concentration to lower concentration is called |
| A. | diffusion |
| B. | concentration |
| C. | effusion |
| D. | mobility |
| Answer» B. concentration | |
| 99. |
In graphite, the carbon atoms are arranged in layers of |
| A. | pentagonal arrays |
| B. | heptagonal arrays |
| C. | octagonal arrays |
| D. | hexagonal arrays |
| Answer» E. | |
| 100. |
A gas that shields living things on the surface of the earth from harmful UV radiation is |
| A. | N2 |
| B. | SO2 |
| C. | O2 |
| D. | O3 |
| Answer» E. | |