NEET Chemistry General Principles and Processes of Isolation of Elements Questions Solved


High purity copper metal is obtained by:

(a) carbon reduction

(b) hydrogen reduction

(c) electrolytic reduction

(d) thermite process

(C) It  is a fact.

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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

(b) Alumino-thermic process is commonly used for those metals  which have very high m.pt. and are to be extracted from their oxides and their reduction with carbon is not satisfactory.

Difficulty Level:

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Purest form of iron is:

(a) cast iron

(b) hard steel

(c) stainless steel

(d) wrought iron

(D) It is a fact.

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Thomas slag is:

(a) calcium silicate

(b) calcium  phosphate

(c) tricalcium phosphate and calcium silicate

(d) calcium ammonium phosphate

(c) Thomas slag is tricalcium phosphate and calcium silicate.

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Corundum is:

(a) SrO2

(b) Al2O3

(c) CaCl2

(d) Cu2Cl2

 

(b) Corundum is a compound of aluminium and consist of crystals of α-Al2O3 (rhombic  lattice).

 

Jagranjosh

Difficulty Level:

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Heating of carbonate ores to remove carbon is called as:

(a) roasting

(b) calcination

(c) smelting

(d) fluxing

(b) Calcination is a process in which the ore is heated strongly in the absence of air.

Difficulty Level:

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Sulphide ores are common for the metals:

(a) Ag, Cu and Pb

(b) Ag, Cu and Sn

(c) Ag, Mg and Pb

(d) Al, Cu and Pb

(a) Metals having high polarising power (Zeff) exist in ore with anions having high polarisibility

Ag, Cu, Pb Sulphide ores (Ag2S, CuFeS2, Pbs)

Sn  Oxide ore (SnO2)

Mg Sea water and dolomite  (CaCO3, MgCO3)

Al Oxide ore (Al2O3.2H2O)

Difficulty Level:

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Which element occurs freely in nature?

(a) Iodine

(b) Sulphur

(c) Phosphorus

(d) Magnesium

(b) Sulphur occurs in native state while iodine, phosphorus and magnesium are found in combined state.

Difficulty Level:

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The metal used in storage batteries is:

(a) Cu

(b) Sn

(c) Pb

(d) Ni

(c) It is one use of lead.

Difficulty Level:

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Silver obtained by argentiferrous lead is purified by:

(a) distillation

(b) froth floatation

(c) cupellation

(d) reacting with KCN

(c) Lead present as impurity in the silver obtained by argentiferous lead is purified by cupellation.

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