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Among statements (a) - (d) , the correct...

Among statements (a) - (d) , the correct ones are
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides
(b) In the extraction of silver , silver is extracted as an anionic complex.
(c) Nickel is purified by Mond's process .
(d) Zr and Ti are purified by Van Arkel method .

A

(a), (b), (c) and (d)

B

(a), (c) and (d) only

C

(c) and (d) only

D

(b), (c) and (d) only

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(1) Metals occur in the native form because of their (a) High electronegativity (b) Low reactivity ( c) Low density (d) High reactivity (2) Specific gravity of slag is (a) Higher than molten metal (b) Same as that of molten metal ( c) Less as that of molten metal (d) None of the above (3) Which process is used for the extraction of metals from their sulphide ores ? (a) Smelting Froth flotation ( c) Electrolysis (d) Metal displacement (4) Calamine is an ore of (a) Hg (b) Zn ( c) Ca (d) Cd (5) Non-fusible impurities of ores removed by adding Slag (b) Flux ( c) Gangue (d) None (6) Common method of extraction of metals from oxide ore involves. (a) Reduction with aluminium (b) Reduction with carbon Reduction with hydrogen (d) Electrolytic method (7) Smelting is the reduction of oxide to metal by (a) Carbon (b) Hydrogen ( c) Aluminimum (d) Electric current During froth flotation process, commonly used frother is. (a) CuSO_(4) (b) NaCN + alkali ( c) Pine oil (d) Potassium xanthate (9) Iron ores are dressed by (a) Froth flotation process (b) Hand picking ( c) Magnetic separation (d) All of the above (10) Silicon is the main constituent of (a) Alloys (b) Rocks ( c) Animals Plants.

Explain the use of the following : (a) NaCN in Froth Floatation Method. (b) Carbon monoxide in Mond process. (c) Coke in the extraction of Zinc from Zinc Oxide

(a) Which metal is extracted from bauxite ore? (b) Give the name of one ore of iron. Which iron compound is preent in this ore? Write its chemical formula. (c). Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved. (d) Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken. (e) name a common metal which is highly resistant to corrosion.

Give the correct of initials T or F following statemetns. Use T if statement is true and F if it is false. (P) Cu metal is extracted from its sulphide by reduction of Cu_(2)O with FeS . (Q) An ore of Tin containing FeWO_(4) is concentrated by magnetic separation method. (R ) Auto redcuton process is used in the extraction of Cu and Hg. Cassiterite and Rutile are oxide ore of the metals.

Among the reactions (a) - (d) , the reactions (s) that does /do not occur in the blast furnace during the extraction of iron is / are (a) CaO+SiO_2rarrCaSiO_3 (b) 3Fe_2O_3+COrarr2Fe_3O_4+CO_2 (c) FeO+SiO_2rarrFeSiO_3 (d) FeOrarrFe+1/2O_2

Complex formed in the following methods are (I) Mond's process for purification of nickel (II) Removal of lead poisoning from the body (III) Cyanide process for extraction of silver (IV) Froth flotation process for separation of ZnS from galena ore by using depresent.

JEE MAINS PREVIOUS YEAR-JEE MAINS 2020-CHEMSITRY
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  2. The correct statement with respect to dinitrogen is :

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  3. Consider the following reactions :

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  4. The major product obtained from the following reaction is :

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  5. A solution of two components containing n1 moles of 1^(st) component a...

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  6. The INCORRECT statement is :

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  7. Consider the Assertion and Reason given below. Assertion (A) : Ethe...

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  8. Arrange the following solutions in the decreasing order of pOH : (A...

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  9. Among the sulphates of alkaline earth metals the solubilities of BeSO4...

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  10. The major products of the following reaction are : CH3 -overset(CH...

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  11. The major product of the following reaction is :

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  12. The presence of soluble fluoride ion upto 1 ppm concentration in drink...

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  13. The increasing order of pKb values of the following compounds is :

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  14. Which of the following compounds shows geometrical isomerism ?

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  15. The set that contains atomic numbers of only transition elements , is ...

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  16. The variation of equilibrium constant with temperature is given below ...

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  17. Kraft temperature is the temperature :

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  18. For the reaction Fe2N(s)+(3)/(2)H2(g)=2Fe(s)+NH3(g)

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  19. The species that has a spin -only magnetic moment of 5.9 BM , is : (...

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  20. The lanthanoid that does NOT show +4 oxidation stat is :

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  21. Consider the following reaction A to P1, B to P2 , C to P3 , D to P4...

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