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MCQOPTIONS
This section includes 1187 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Before introducing \[FeO\]in blast furnace , it is converted to \[F{{e}_{2}}{{O}_{3}}\] by roasting so that |
| A. | it may not be removed as slag with silica |
| B. | it may not evaporate in the furnace |
| C. | presence of it may increase the m.pt. of charge |
| D. | None of these |
| Answer» B. it may not evaporate in the furnace | |
| 302. |
During smelting an additional substance is added which combines with impurities to form a fusible product. It is known as |
| A. | slag |
| B. | mud |
| C. | gangue |
| D. | flux |
| Answer» E. | |
| 303. |
Among the following statements the incorrect one is |
| A. | Calamine and siderite are carbonates |
| B. | Argentite and cuprite are oxides |
| C. | Zinc blende and iron pyrites are sulphides |
| D. | Malachite and azurite are ores of copper. |
| Answer» C. Zinc blende and iron pyrites are sulphides | |
| 304. |
In Goldschmidt aluminothermic process which of the following reducing agents is used: |
| A. | calcium |
| B. | coke |
| C. | Al-powder |
| D. | sodium |
| Answer» D. sodium | |
| 305. |
Calcination is the process in which: |
| A. | ore is heated above its melting point to expel \[{{H}_{2}}O\] or \[C{{O}_{2}}\] or \[S{{O}_{2}}\] |
| B. | ore is heated below its melting point to expel volatile impurities |
| C. | ore is heated above its melting point to remove S, As and Sb as \[S{{O}_{2}},\,\,A{{s}_{2}}{{O}_{3}}\] and \[S{{b}_{2}}{{O}_{3}}\] respectively |
| D. | ore is heated below its melting point to expel \[{{H}_{2}}O\] or \[C{{O}_{2}}\] |
| Answer» E. | |
| 306. |
A coupled reaction takes place as follow- \[A+B\xrightarrow{{}}C+D\] \[\Delta G{}^\circ =+xkj\] \[D+E\xrightarrow{{}}F\] \[\Delta G{}^\circ =-ykj\] for the spontaneity of reaction \[A+B+E\xrightarrow{{}}C+F\], which of the following is correct? |
| A. | \[2x=y\] |
| B. | \[x<y\] |
| C. | \[x>y\] |
| D. | \[x=\left( y \right)\times T\Delta S\] |
| Answer» C. \[x>y\] | |
| 307. |
Which of the following statement(s) is/are correct? (i) Cast iron is used in the manufacture of railway sleepers (ii) Wrought iron is used in the manufacture of anchors, bolts, chains etc. (iii) Nickel steel is used in making pendulums. |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i),(ii) and (iii) |
| D. | Only (iii) |
| Answer» D. Only (iii) | |
| 308. |
One of the processes used for concentration of ores is Froth floatation process. This process is generally used for concentration of sulphide ores. Sometimes in this process we add NaCN as a depressant. NaCN is generally added in case of ZnS and PbS minerals. What is the purpose of addition of NaCN during the process of Froth floatation? |
| A. | NaCN causes reduction by precipitation |
| B. | A soluble complex is formed by reaction between NaCN and ZnS while PbS forms froth |
| C. | A soluble complex is formed by reaction between NaCN and PbS while ZnS forms froth |
| D. | A precipitate of \[Pb{{(CN)}_{2}}\] is produced while ZnS remain unaffected. |
| Answer» C. A soluble complex is formed by reaction between NaCN and PbS while ZnS forms froth | |
| 309. |
When copper pyrites is roasted in excess of air, a mixture of \[CuO+FeO\] is formed. \[FeO\] is present as impurity. This can be removed as slag during reduction of \[FeO\]. The flux added to form slag is |
| A. | \[Si{{O}_{2}}\] which is an acidic flux |
| B. | Limestone, which is a basic flux |
| C. | \[Si{{O}_{2}}\] which is the basic flux |
| D. | CaO, which is a basic flux |
| Answer» B. Limestone, which is a basic flux | |
| 310. |
Correct match is: |
| A. | Bayer's method - \[N{{a}_{2}}C{{O}_{3}}\] |
| B. | Matte - 98% \[C{{u}_{2}}S+2\]% \[FeS\] |
| C. | van Arkel method - AgI |
| D. | Thomas slag - Raw material for cement industry |
| Answer» C. van Arkel method - AgI | |
| 311. |
Aluminium is extracted from alumina \[(A{{l}_{2}}{{O}_{3}})\] by electrolysis of a molten mixture of |
| A. | \[A{{l}_{2}}{{O}_{3}}+HF+NaAl{{F}_{4}}\] |
| B. | \[A{{l}_{2}}{{O}_{3}}+Ca{{F}_{2}}+NaAl{{F}_{4}}\] |
| C. | \[A{{l}_{2}}{{O}_{3}}+N{{a}_{3}}Al{{F}_{6}}+Ca{{F}_{2}}\] |
| D. | \[A{{l}_{2}}{{O}_{3}}+KF+N{{a}_{3}}Al{{F}_{6}}\] |
| Answer» D. \[A{{l}_{2}}{{O}_{3}}+KF+N{{a}_{3}}Al{{F}_{6}}\] | |
| 312. |
Which of the following pairs of metals is purified by van Arkel method? |
| A. | Ga and in |
| B. | Zr and Ti |
| C. | Ag and Au |
| D. | Ni and Fe |
| Answer» C. Ag and Au | |
| 313. |
The impurities associated with mineral used in metallurgy are called collectively? |
| A. | Slag |
| B. | Flux |
| C. | Gangue |
| D. | Ore |
| Answer» D. Ore | |
| 314. |
Which of the following elements is present as the impurity to the maximum extent in the pig iron? |
| A. | Manganese |
| B. | Carbon |
| C. | Silicon |
| D. | Phosphorus |
| Answer» C. Silicon | |
| 315. |
Pb and Sn are extracted from their chief ore by |
| A. | carbon reduction and self reduction. |
| B. | self reduction and carbon reduction. |
| C. | electrolysis and self reduction. |
| D. | self-reduction and electrolysis. |
| Answer» C. electrolysis and self reduction. | |
| 316. |
Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching? |
| A. | Galena |
| B. | Copper pyrite |
| C. | Sphalerite |
| D. | Argentite |
| Answer» E. | |
| 317. |
Which of the following metal is leached by cyanide process |
| A. | Ag |
| B. | Na |
| C. | Al |
| D. | Cu |
| Answer» B. Na | |
| 318. |
Froth floatation process is used for the metallurgy of |
| A. | chloride ores |
| B. | amalgams |
| C. | oxide ores |
| D. | sulphide ores |
| Answer» E. | |
| 319. |
Cryolite is |
| A. | \[N{{a}_{3}}Al{{F}_{6}}\] and used in the electrolysis of alumina for decreasing electrical conductivity |
| B. | \[N{{a}_{3}}Al{{F}_{6}}\]and used in the electrolysis of alumina for lowering the melting point of alumina |
| C. | \[N{{a}_{3}}Al{{F}_{6}}\]and used in the electrolytic purification of alumina |
| D. | \[N{{a}_{3}}Al{{F}_{6}}\] and used in the electrolysis of alumina |
| Answer» C. \[N{{a}_{3}}Al{{F}_{6}}\]and used in the electrolytic purification of alumina | |
| 320. |
In the isolation of metals, calcination process usually results in: |
| A. | metal hydroxide |
| B. | metal sulphide |
| C. | metal oxide |
| D. | metal carbonate |
| Answer» D. metal carbonate | |
| 321. |
Calamine is an ore of: |
| A. | zinc |
| B. | aluminium |
| C. | iron |
| D. | copper |
| Answer» B. aluminium | |
| 322. |
Which one of the following ores is known as Malachite: |
| A. | \[C{{u}_{2}}O\] |
| B. | \[C{{u}_{2}}S\] |
| C. | \[CuFe{{S}_{2}}\] |
| D. | \[Cu{{\left( OH \right)}_{2}}.CuC{{O}_{3}}\] |
| Answer» E. | |
| 323. |
In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with |
| A. | iron (II) sulphide |
| B. | carbon monoxide |
| C. | copper (I) sulphide |
| D. | sulphur dioxide |
| Answer» B. carbon monoxide | |
| 324. |
Aluminothermic process is used for the extraction of metals, whose oxides are |
| A. | fusible |
| B. | not easily reduced by carbon |
| C. | not easily reduced by hydrogen |
| D. | strongly basic. |
| Answer» C. not easily reduced by hydrogen | |
| 325. |
When \[CuS{{O}_{4}}\] is electrolysed using platinum electrodes, |
| A. | copper is liberated at cathode, sulphur at anode |
| B. | copper is liberated at cathode, oxygen at anode |
| C. | sulphur is liberated at cathode; oxygen anode |
| D. | oxygen is liberated at cathode, copper at anode |
| Answer» C. sulphur is liberated at cathode; oxygen anode | |
| 326. |
Iron is obtained on large scale from \[F{{e}_{2}}{{O}_{3}}\] by |
| A. | Reduction with CO |
| B. | Reduction with Al |
| C. | Calcination |
| D. | Passing \[{{H}_{2}}\] |
| Answer» B. Reduction with Al | |
| 327. |
Which of the following statement is not correct about Ellingham diagram? |
| A. | \[\Delta G\] increases with an increase in temperature |
| B. | It consists of plots of \[{{\Delta }_{f}}G{}^\circ \] Vs T for formation of oxides |
| C. | A coupling reaction can be well expressed by this diagram |
| D. | It express the kinetics of the reduction process |
| Answer» E. | |
| 328. |
The value of \[{{\Delta }_{f}}G{}^\circ \] for formation of \[C{{r}_{2}}{{O}_{3}}\] is \[-540\text{ }kJmo{{l}^{-1}}\] and that of \[A{{l}_{2}}{{O}_{3}}\] is \[-827\text{ }kJ\text{ }mo{{l}^{-1}}\] What is the value of \[{{\Delta }_{f}}G{}^\circ \] for the reaction? \[\frac{4}{3}Al(s)+\frac{2}{3}C{{r}_{2}}{{O}_{3}}(s)\to \frac{2}{3}A{{l}_{2}}{{O}_{3}}(s)+\frac{4}{3}Cr(s).\] |
| A. | \[-574\text{ }kJ\,mo{{l}^{-1}}\] |
| B. | \[-287\,kJ\,mo{{l}^{-1}}\] |
| C. | \[+574\text{ }kJ\,mo{{l}^{-1}}\] |
| D. | \[+287kJ\,mo{{l}^{-1}}\] |
| Answer» C. \[+574\text{ }kJ\,mo{{l}^{-1}}\] | |
| 329. |
van Arkel method of purification of metals involves converting the metal to a |
| A. | volatile stable compound |
| B. | volatile unstable compound |
| C. | non volatile stable compound |
| D. | None of the above |
| Answer» B. volatile unstable compound | |
| 330. |
In order to refine "blister copper" it is melted in a furnace and is stirred with green logs of wood. The purpose is |
| A. | to expel the dissolved gases in blister copper. |
| B. | to bring the impurities to surface and oxidize them. |
| C. | to increase the carbon content of copper. |
| D. | to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood. |
| Answer» E. | |
| 331. |
Which one of the following is not a sulphide ore? |
| A. | Magnetite |
| B. | Iron pyrites |
| C. | Copper glance |
| D. | Sphalerite |
| Answer» B. Iron pyrites | |
| 332. |
Which of the following is/are the hazardous pollutant(s) present in automobile exhaust gases? (i) \[{{N}_{2}}\] (ii) CO (iii) \[C{{H}_{4}}\] (iv) Oxides of nitrogen |
| A. | (ii) and (iii) |
| B. | (i) and (ii) |
| C. | (ii) and (iv) |
| D. | (i) and (iii) |
| Answer» D. (i) and (iii) | |
| 333. |
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal? |
| A. | \[{{O}_{3}}\] and \[C{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] and \[N{{O}_{2}}\] |
| C. | \[S{{O}_{2}}\] and\[N{{O}_{2}}\] |
| D. | \[S{{O}_{2}}\] and \[{{O}_{3}}\] |
| Answer» D. \[S{{O}_{2}}\] and \[{{O}_{3}}\] | |
| 334. |
Which of the following is/are formed when ozone reacts with the unburnt hydrocarbons in polluted air? (i) Formaldehyde (ii) Acrolein (iii) Peroxyacetyl nitrate (iv) Formic acid |
| A. | (i) and (iv) |
| B. | (ii) only |
| C. | (iii) only |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 335. |
In almost all Indian metropolitan cities like Delhi, the major atmospheric pollutant(s) is/are |
| A. | suspended particulate matter (SPM) |
| B. | oxides of sulphur |
| C. | carbon dioxide and carbon monoxide |
| D. | oxides of nitrogen |
| Answer» B. oxides of sulphur | |
| 336. |
Which one of the following pairs is mismatched |
| A. | Fossil fuel burning - release of \[C{{O}_{2}}\] |
| B. | Nuclear power - radioactive wastes |
| C. | Solar energy - Greenhouse effect |
| D. | Biomass burning - release of \[C{{O}_{2}}\] |
| Answer» D. Biomass burning - release of \[C{{O}_{2}}\] | |
| 337. |
Which of the following statement(s) is/are correct?(i) Classical smog is a mixture of smoke fog and sulphur dioxide.(ii) Classical smog is also called oxidising smog (iii) Hydrocarbons \[N{{O}_{2}}\] and PAN are components of photochemical smog. |
| A. | (i) and (iii) |
| B. | (i) and (ii) |
| C. | (iii) only |
| D. | (i), (ii) and (iii) |
| Answer» B. (i) and (ii) | |
| 338. |
Lichens do not like to grow in cities |
| A. | because of absence of the right type of algae and fungi |
| B. | because of lack of moisture |
| C. | because of \[S{{O}_{2}}\] pollution |
| D. | because natural habitat is missing |
| Answer» D. because natural habitat is missing | |
| 339. |
Excess nitrate in drinking water can cause |
| A. | methemoglobinemia |
| B. | kidney damage |
| C. | liver damage |
| D. | laxative effect |
| Answer» B. kidney damage | |
| 340. |
In a coal fired power plant, electrostatic precipitators are installed to control emission of |
| A. | \[S{{O}_{2}}\] |
| B. | \[N{{O}_{x}}\] |
| C. | SPM |
| D. | CO |
| Answer» D. CO | |
| 341. |
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution? |
| A. | Sulphur dioxide |
| B. | Carbon dioxide |
| C. | Nitrogen dioxide |
| D. | Tetrachloroethylene |
| Answer» E. | |
| 342. |
The irritant red haze in the traffic and congested places is due to presence of which of the following? (i) Oxides of sulphur (ii) Oxides of nitrogen (iii) Carbon dioxide (iv) Mists, smoke and dust (v) Smog |
| A. | (i), (iv) and (v) |
| B. | (iii) only |
| C. | (ii) only |
| D. | (ii) and (v) |
| Answer» D. (ii) and (v) | |
| 343. |
Which one of the following statements is not |
| A. | Dissolved oxygen (DO) in cold water can reach a concentration upto 10 ppm. |
| B. | Clean water would have a BOD value of 5 ppm. |
| C. | Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm. |
| D. | When the pH of rain water is higher than 6.5, it is called acid rain. |
| Answer» E. | |
| 344. |
High concentration of which of the following in atmosphere leads to stiffness of flower buds which eventually fall off from plants? |
| A. | \[N{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | CFC |
| D. | Smog |
| Answer» C. CFC | |
| 345. |
Carbon monoxide (CO) is harmful to man because |
| A. | it forms carbolic acid. |
| B. | it generates excess \[C{{O}_{2}}\] |
| C. | it is carcinogenic. |
| D. | it competes with \[{{O}_{2}}\], for haemoglobin. |
| Answer» E. | |
| 346. |
Green house gases |
| A. | allow shorter wavelength to enter earth's atmosphere while doesn't allow longer wave-length to leave the earth's atmosphere. |
| B. | allow longer wavelength to enter earth atmosphere while doesn't allow shorter wave-length to leave the surface |
| C. | do not have wavelength specific character. |
| D. | show wavelength specific behaviour near the earth while far from earth these have wavelength independent behaviour. |
| Answer» B. allow longer wavelength to enter earth atmosphere while doesn't allow shorter wave-length to leave the surface | |
| 347. |
The statement which is not correct about control of particulate pollution: |
| A. | In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed. |
| B. | Gravity settling chamber removes larger particles from the air. |
| C. | Cyclone collector removes fine particles in the diameter range 5-20 microns. |
| D. | Wet scrubbers are used to wash away all types of particulates. |
| Answer» B. Gravity settling chamber removes larger particles from the air. | |
| 348. |
In Antarctica ozone depletion is due to the formation of following compound |
| A. | acrolein |
| B. | peroxyacetyl nitrate |
| C. | \[S{{O}_{2}}\]and \[S{{O}_{3}}\] |
| D. | chlorine nitrate |
| Answer» B. peroxyacetyl nitrate | |
| 349. |
Which of the following chemical, harmful to ozone, is released by chlorofluorocarbon? |
| A. | Sulphur dioxide |
| B. | Fluorine |
| C. | Chlorine |
| D. | Nitrogen dioxide |
| Answer» D. Nitrogen dioxide | |
| 350. |
Which forms the part of hazy fumes of photochemical smog? |
| A. | \[S{{O}_{2}}\] |
| B. | Nitrogen dioxide |
| C. | PAN formation |
| D. | Aldehydes |
| Answer» C. PAN formation | |