MCQOPTIONS
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MCQOPTIONS
This section includes 279 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Copper pyrites (CuFeS |
| A. | electromagnetic method |
| B. | gravity method |
| C. | froth floatation method |
| D. | all of above methods |
| Answer» D. all of above methods | |
| 102. |
In electro-refining the impure metal is made |
| A. | cathode |
| B. | anode |
| C. | both |
| D. | none |
| Answer» C. both | |
| 103. |
In metallurgy flux is a substance used to convert |
| A. | infusible impurities to fusible material |
| B. | soluble impurities to insoluble impurities |
| C. | fusible impurities to infusible impurities |
| D. | mineral to silicate |
| Answer» B. soluble impurities to insoluble impurities | |
| 104. |
In the electrolytic refining of a metal |
| A. | crude metal is made anode |
| B. | crude metal is made cathode |
| C. | crude ore is made eathode |
| D. | crude ore is made anode |
| Answer» B. crude metal is made cathode | |
| 105. |
The metallurgical process in which metal is obtained in fused state is known as |
| A. | froth floatation process |
| B. | calcination |
| C. | roasting |
| D. | smelting |
| Answer» E. | |
| 106. |
The oxidation state of chromium in K |
| A. | +6 |
| B. | +3 |
| C. | +7 |
| D. | +4 |
| Answer» B. +3 | |
| 107. |
The most common actinide is |
| A. | thorium |
| B. | europium |
| C. | lanthanum |
| D. | samarium |
| Answer» B. europium | |
| 108. |
The oxidation number of Fe in Fe |
| A. | +2 |
| B. | 2/3 |
| C. | +3 |
| D. | 8/3 |
| Answer» E. | |
| 109. |
The nature of an aqueous solution of FeCl |
| A. | basic |
| B. | acidic |
| C. | amphoteric |
| D. | neutral |
| Answer» C. amphoteric | |
| 110. |
Which metal shows more than one oxidation state ? |
| A. | Na |
| B. | Mg |
| C. | Fe |
| D. | None of these |
| Answer» D. None of these | |
| 111. |
Gold is extracted by hydrometallurgical process, based on its property |
| A. | of being electropositive |
| B. | of being less reactive |
| C. | to form complexes which are soluble |
| D. | to form salts which are water soluble |
| Answer» D. to form salts which are water soluble | |
| 112. |
In the blast furnace, iron oxide is reduced by |
| A. | carbon |
| B. | carbon monoxide |
| C. | silica |
| D. | hot blast of air |
| Answer» C. silica | |
| 113. |
Number of water molecules present in Mohr's salt is |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 114. |
The process of converting hydrate Al |
| A. | Smelting |
| B. | Roasting |
| C. | Calcination |
| D. | Dressing |
| Answer» D. Dressing | |
| 115. |
Certain (at number 58) is a member of |
| A. | s-block elements |
| B. | p-block elements |
| C. | d-block elements |
| D. | f-block elements |
| Answer» E. | |
| 116. |
Transition metals |
| A. | are diamagnetic |
| B. | show inert pair effect |
| C. | do not form alloys |
| D. | show variable valency |
| Answer» E. | |
| 117. |
The process of ore dressing is carried out to |
| A. | add flux to the mineral |
| B. | convert the ore to oxide |
| C. | removal of the siliceous materials |
| D. | remove the poisonous impurities |
| Answer» D. remove the poisonous impurities | |
| 118. |
Why are stainless steel cooking pans fabricated with copper bottom ? |
| A. | Copper is cheaper |
| B. | Conductivities of copper is more than the stainless steel |
| C. | Copper increases durability of the cooking pan |
| D. | Copper is a good reflector of heat |
| Answer» C. Copper increases durability of the cooking pan | |
| 119. |
Which is the used in storage batteries |
| A. | Cu |
| B. | lead |
| C. | tin |
| D. | zinc |
| Answer» C. tin | |
| 120. |
Parke's process is used |
| A. | to extract Cu using CuFeS |
| B. | <sub>2</sub> |
| C. | to extract Ag from argentiferrous lead |
| D. | to extract Ag by forming amalgam |
| E. | to extract Ag using NaCN |
| Answer» C. to extract Ag from argentiferrous lead | |
| 121. |
The substance used as an activator in froth floatation process is |
| A. | Pine oil |
| B. | Potassium ethyl xanthate |
| C. | Copper sulphate |
| D. | Sodium Cyanide |
| Answer» D. Sodium Cyanide | |
| 122. |
Tin and lead can be refined by |
| A. | Poling |
| B. | Liquation |
| C. | Bessemerisation |
| D. | Cupellation |
| Answer» C. Bessemerisation | |
| 123. |
The element which is sometimes found in native state |
| A. | Al |
| B. | Cu |
| C. | Fe |
| D. | Si |
| Answer» C. Fe | |
| 124. |
When sodium and chlorine react |
| A. | energy released and ionic bond is formed |
| B. | energy released and covalent bond is formed |
| C. | energy absorbed and ionic bond is formed |
| D. | None of these |
| Answer» B. energy released and covalent bond is formed | |
| 125. |
An important ore for iron is |
| A. | pitch blende |
| B. | galena |
| C. | malachite |
| D. | heamatite |
| Answer» E. | |
| 126. |
Purification of aluminium by electrolyte refining is known as |
| A. | Hoop's process |
| B. | Serpeck's process |
| C. | Hall's process |
| D. | Baeyer's process |
| Answer» B. Serpeck's process | |
| 127. |
The atomic number (Z) of an element is 25. In its ground state, how many electrons are present in the 'N' shell ? |
| A. | 2 |
| B. | 3 |
| C. | 13 |
| D. | 15 |
| Answer» B. 3 | |
| 128. |
The essential metal of an amalgam is |
| A. | Any base |
| B. | Any alkali metal |
| C. | Copper |
| D. | Mercury |
| Answer» E. | |
| 129. |
Which of the following alkaline earth metal is used in manufacture of aeroplane parts ? |
| A. | Se |
| B. | Ca |
| C. | Mg |
| D. | Be |
| Answer» D. Be | |
| 130. |
The main constituents of bronze are |
| A. | Cu and Sn |
| B. | Cu and Ni |
| C. | Cu and Zn |
| D. | Zn and Sn |
| Answer» B. Cu and Ni | |
| 131. |
Transition metals mostly are |
| A. | Paramagnetic |
| B. | diamagnetic |
| C. | both paramagnetic and diamagnetic |
| D. | neither paramagnetic nor diamagnetic |
| Answer» B. diamagnetic | |
| 132. |
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 | |
| 133. |
The metal used in incandescent lamps is |
| A. | Mo |
| B. | Pt |
| C. | W |
| D. | Cr |
| Answer» D. Cr | |
| 134. |
the paramagnetic character of the metals is due to |
| A. | Completely filled orbitals |
| B. | Unpaired electrons |
| C. | Variable valency |
| D. | Low melting and boiling point |
| Answer» C. Variable valency | |
| 135. |
Which of the following cannot form peroxides and superoxides ? |
| A. | Na |
| B. | Li |
| C. | K |
| D. | Rb |
| Answer» C. K | |
| 136. |
Alkali metals in each period have |
| A. | Lowest IE |
| B. | Highest IE |
| C. | High electro-negativity |
| D. | None of these |
| Answer» B. Highest IE | |
| 137. |
Steel differs from pig iron and wrought iron that it contains |
| A. | Less carbon |
| B. | More carbon |
| C. | Amount of carbon intermediate between these tow |
| D. | No carbon at all |
| Answer» D. No carbon at all | |
| 138. |
The elements of group I are known as alkali metals as |
| A. | Their oxides are alkaline |
| B. | Their hydrides are strongly alkaline |
| C. | The metals are corroded by alkali |
| D. | None of the above |
| Answer» B. Their hydrides are strongly alkaline | |
| 139. |
Which of the following are not concentrated by froth floatation method ? |
| A. | Copper pyrite |
| B. | Pentlandite |
| C. | Pyrolusite |
| D. | Zinc blende |
| Answer» C. Pyrolusite | |
| 140. |
An example of halide ores is |
| A. | Bauxite |
| B. | Cinnabar |
| C. | Cryolite |
| D. | Galena |
| Answer» D. Galena | |
| 141. |
Malachite is a mineral of |
| A. | Mg |
| B. | Cu |
| C. | Al |
| D. | Fe |
| Answer» C. Al | |
| 142. |
Calamine is an ore of |
| A. | Ag |
| B. | Cu |
| C. | Fe |
| D. | Zn |
| Answer» E. | |
| 143. |
The colour of iodine solution is discharged by shaking it with aqueous solution of |
| A. | sodium sulphate |
| B. | sodium sulphite |
| C. | sodium thiosulphate |
| D. | sulphuric acid |
| Answer» D. sulphuric acid | |
| 144. |
Ni is purified by |
| A. | Mond process |
| B. | Zone refining process |
| C. | Nan-arkel process |
| D. | none |
| Answer» B. Zone refining process | |
| 145. |
Lanthanides and actinides resemble in |
| A. | oxidation state |
| B. | ionization energy |
| C. | formation of complexes |
| D. | electron configuration |
| Answer» E. | |
| 146. |
The most abundant element on earth curst is |
| A. | hydrogen |
| B. | oxygen |
| C. | silicon |
| D. | carbon |
| Answer» C. silicon | |
| 147. |
Which of the following processes is not used for the purification of solid impurities ? |
| A. | sublimation |
| B. | distillation |
| C. | vaporisation |
| D. | crystallization |
| Answer» C. vaporisation | |
| 148. |
Which of the following is an ore of copper here ? |
| A. | Malachite |
| B. | Bauxite |
| C. | Dolomite |
| D. | Cinnabar |
| Answer» B. Bauxite | |
| 149. |
Which of the following is a fluoride mineral of aluminium ? |
| A. | felspar |
| B. | cryolite |
| C. | mica |
| D. | porcels |
| Answer» C. mica | |
| 150. |
Which of the following methods is used to purify tin ? |
| A. | poling |
| B. | electrolytic refining |
| C. | liquation |
| D. | all of these |
| Answer» E. | |