MCQOPTIONS
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MCQOPTIONS
This section includes 1300 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Which of the following processes is used to remove reducible oxides from the metal? |
| A. | Liquation |
| B. | Cupellation |
| C. | Poling |
| D. | Electro refining |
| Answer» D. Electro refining | |
| 102. |
Leakage of which of the following gases caused the Bhopal gas tragedy ? |
| A. | Carbon monoxide |
| B. | Methyl isocyanate |
| C. | Nitrous oxide |
| D. | Hydrogen sulphide |
| Answer» C. Nitrous oxide | |
| 103. |
Formation of anions occurs by |
| A. | Loss of neutrons |
| B. | Gain of protons |
| C. | Gain of electrons |
| D. | None |
| Answer» D. None | |
| 104. |
A bond formed by the transfer of electrons betwwen atoms of the elements is called |
| A. | Ionic bond |
| B. | Covalent bond |
| C. | Co ordinate bond |
| D. | None |
| Answer» B. Covalent bond | |
| 105. |
The law of constant proportions was enunciated by |
| A. | Dalton |
| B. | Berthelot |
| C. | Avogadro |
| D. | Proust |
| Answer» E. | |
| 106. |
Species containing same number of electrons are called |
| A. | Isotopes |
| B. | Isobars |
| C. | Isoelectronic |
| D. | Isotones |
| Answer» D. Isotones | |
| 107. |
Ethanol is converted into ethoxy ethane, |
| A. | By heating excess of ethanol with conc. h2so4 at 140 c |
| B. | By treating with conc. h2so4 at room temperature |
| C. | By treating with conc. h2so4 at 273 k |
| D. | By heating ethanol with excess of conc. h2so4 at 443 k |
| Answer» B. By treating with conc. h2so4 at room temperature | |
| 108. |
ATP stands for - |
| A. | Adenosine triphosphate |
| B. | Alanine triphosphate |
| C. | Adrenalin triphosphate |
| D. | Asparagine triphosphate |
| Answer» B. Alanine triphosphate | |
| 109. |
The number of neutrons in dipositive Zinc ion is |
| A. | 34 |
| B. | 36 |
| C. | 38 |
| D. | 40 |
| Answer» E. | |
| 110. |
A pure substance can only be |
| A. | Compound |
| B. | An element |
| C. | An element or a compound |
| D. | A heterogeneous mixture |
| Answer» D. A heterogeneous mixture | |
| 111. |
Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not |
| A. | Microscope |
| B. | Scintillation counter |
| C. | Lead plate |
| D. | Pectrophotometer |
| Answer» C. Lead plate | |
| 112. |
Recycled plant matter is known as ? |
| A. | Decomposed |
| B. | Carbide |
| C. | Compost |
| D. | None |
| Answer» D. None | |
| 113. |
TEL minimise the knocking effect when mixed with petrol, it acts as_______ |
| A. | Positive catalyst |
| B. | Negative catalyst |
| C. | Auto catalyst |
| D. | Induced catalyst |
| Answer» C. Auto catalyst | |
| 114. |
Chloroform used as anaesthetic should be preserved in the dark in tightly stoppered bottles because otherwise |
| A. | It becomes coloured |
| B. | It gets evaporated in air |
| C. | It gets oxidised to phosgene |
| D. | It gets decomposed to chloropicrin |
| Answer» D. It gets decomposed to chloropicrin | |
| 115. |
Which of the following acts both as oxidising and reducing agent? |
| A. | Nitric acid |
| B. | Ammonia |
| C. | Nitrous acid |
| D. | Nitrogen peroxide |
| Answer» D. Nitrogen peroxide | |
| 116. |
Silver Mirror test is given by which one of the following compounds? |
| A. | Only 1 |
| B. | Only 2 |
| C. | 1 and 3 |
| D. | 2 and 4 |
| Answer» E. | |
| 117. |
Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to |
| A. | Dehydration |
| B. | Oxidation |
| C. | Reduction |
| D. | Dehydrogenation |
| Answer» C. Reduction | |
| 118. |
Positive ions are formed from neutral atoms by loss of |
| A. | Neutrons |
| B. | Protons |
| C. | Nuclear charge |
| D. | Electrons |
| Answer» E. | |
| 119. |
The first indication that a stable nucleus can be broken down was afforded by |
| A. | Rutherford |
| B. | Madam curie |
| C. | Soddy |
| D. | Schmidt |
| Answer» B. Madam curie | |
| 120. |
Blue litmus paper is converted into red in solution of _______ |
| A. | Acid |
| B. | Base |
| C. | Alkali |
| D. | Salt |
| Answer» B. Base | |
| 121. |
Formation of cation occurs by |
| A. | Gain of electron |
| B. | Loss of electron |
| C. | Gain of proton |
| D. | Loss of proton |
| Answer» C. Gain of proton | |
| 122. |
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at : |
| A. | 518 nm |
| B. | 1035 nm |
| C. | 325 nm |
| D. | 743 nm |
| Answer» E. | |
| 123. |
The charge on positron is equal to the charge on |
| A. | Proton |
| B. | Electron |
| C. | Alpha- particle |
| D. | Neutron |
| Answer» B. Electron | |
| 124. |
The maximum number of hydrogen bonds in a water molecule is........... |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 125. |
An element which is preserved under water is |
| A. | Sodium |
| B. | Sulphur |
| C. | Red phosphorus |
| D. | White phosphorus |
| Answer» E. | |
| 126. |
Which of the following is a radioactive element |
| A. | Sulphur |
| B. | Polonium |
| C. | Tellurium |
| D. | Selenium |
| Answer» C. Tellurium | |
| 127. |
Which one of the following is used to induce artificial rain ? |
| A. | Potassium nitrate |
| B. | Ammonium chloride |
| C. | Calcium carbonate |
| D. | Silver lodide |
| Answer» E. | |
| 128. |
Neutron was discovered by |
| A. | J.j.thomson |
| B. | Chadwick |
| C. | Rrutherford |
| D. | Priestley |
| Answer» C. Rrutherford | |
| 129. |
Triple point of water corresponds to |
| A. | 1 atm, 0 c |
| B. | 1 atm, 0.01 c |
| C. | 1 atm, 0 k |
| D. | 4.58 torr, 0.01 c |
| Answer» E. | |
| 130. |
The particle with 13 protons and 10 electrons is |
| A. | Al -atom |
| B. | Al3+ ion |
| C. | Nitrogen isotope |
| D. | None of these |
| Answer» C. Nitrogen isotope | |
| 131. |
Standard Electrode potential is measured in terms of |
| A. | Pyrometer |
| B. | Electrometer |
| C. | Thermometer |
| D. | Voltmeter |
| Answer» E. | |
| 132. |
Cathode rays have |
| A. | Mass only |
| B. | Charge only |
| C. | No mass and no charge |
| D. | Mass and charge both |
| Answer» E. | |
| 133. |
The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ? |
| A. | 4th |
| B. | 2nd |
| C. | 3rd |
| D. | 1st |
| Answer» C. 3rd | |
| 134. |
Which of the following carbon compounds is used as a fire- extinguisher? |
| A. | Carbon disulphide |
| B. | Chloroform |
| C. | Carbon tetrachloride |
| D. | Methyl ene chloride |
| Answer» D. Methyl ene chloride | |
| 135. |
Which among the following is the most electronegative element? |
| A. | Flourine |
| B. | Bromine |
| C. | Iodine |
| D. | Oxygen |
| Answer» B. Bromine | |
| 136. |
One method by which the components of air can be seperated is |
| A. | Shaking with caustic soda solution |
| B. | Shaking with water |
| C. | Fractional distillation of liquid air |
| D. | Passing air over heated magnesium |
| Answer» D. Passing air over heated magnesium | |
| 137. |
Leakage in LP gas cylinders is easily detected by adding |
| A. | Mercaptans |
| B. | Propylene |
| C. | Carbon disulphide |
| D. | Phosgene |
| Answer» B. Propylene | |
| 138. |
The substances that are composed of to or more different elements in fixed proportion by mass are called |
| A. | Mixture |
| B. | Compound |
| C. | Element |
| D. | None of these |
| Answer» C. Element | |
| 139. |
Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate andanother compound. The other compound is : |
| A. | Chloroform |
| B. | 2, 2, 2-trichloroethanol |
| C. | Trichloromethanol |
| D. | 2, 2, 2-trichloropropanol |
| Answer» C. Trichloromethanol | |
| 140. |
Which of the following does not contain the material particles |
| A. | Alpha - rays |
| B. | Beta - rays |
| C. | Gamma - rays |
| D. | Anode rays |
| Answer» D. Anode rays | |
| 141. |
Which of the properties of the element is a whole number |
| A. | Atomic mass |
| B. | Atomic number |
| C. | Atomic radius |
| D. | Atomic volume |
| Answer» C. Atomic radius | |
| 142. |
Which of the following is a non metal that remains liquid at room temperature ? |
| A. | Chlorine |
| B. | Phosphorous |
| C. | Bromine |
| D. | Helium |
| Answer» D. Helium | |
| 143. |
According to the modern Periodic Law, the properties of elements are periodic functions of their |
| A. | Volency |
| B. | Atomic mass |
| C. | Number of neutrons |
| D. | Atomic number |
| Answer» E. | |
| 144. |
The electrochemical cell stops working after some time because ________ |
| A. | Electrode potential of both the electrodes becomes zero |
| B. | One of electrodes completely vanishes |
| C. | Electrode potential of both electrodes equalizes |
| D. | The reaction reverses its direction |
| Answer» D. The reaction reverses its direction | |
| 145. |
Which gas is known as "Fuel of Future" ? |
| A. | Methane |
| B. | Oxygen |
| C. | Neon |
| D. | Hydrogen |
| Answer» E. | |
| 146. |
Wavelength of which of the following colours of the visible spectrum of light are maximally absorbed by green plants________ |
| A. | Green and yellow |
| B. | Red and blue |
| C. | Green and red |
| D. | Blue and yellow |
| Answer» C. Green and red | |
| 147. |
Which one of the following substances does not have a melting point |
| A. | Bromine |
| B. | Sodium chloride |
| C. | Mercury |
| D. | Glass |
| Answer» E. | |
| 148. |
All of the following are constituents of RNA molecule except _____ |
| A. | Thymine |
| B. | Adenine |
| C. | Uracil |
| D. | Guanine |
| Answer» B. Adenine | |
| 149. |
Water always contains hydrogen and oxygen in the ratio 1:8 by weight.This is in accordance with the |
| A. | Law of multiple proportions |
| B. | Law of definite proportion |
| C. | Law of conservation of mass |
| D. | Law of reciprocal proportions |
| Answer» C. Law of conservation of mass | |
| 150. |
A particle which is four times in mass and two times in charge that of proton is |
| A. | Helium atom |
| B. | An alpha particle |
| C. | Deuteron |
| D. | Tritium |
| Answer» C. Deuteron | |