Which of following statement(s) is / are incorrect ?

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General Principles and processes of Isolation of Elements

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Which of the following statement(s) is / are incorrect ?

A

Liquation is applied when the metal has low melting point than that of impurities.

B

Presence of carbon in steel makes it hard due to formation of $Fe_3C$ called cementite.

C

Less reactive metals like $Hg, Pb$ and $Cu$ are obtained by auto reduction of their sulphide or oxide ores.

D

Amalgamation method of purification cannot be applied for $Au$ and $Ag.$

Solution

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Standard 12

Chemistry

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Select the incorrect one

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Read the following statements :

$(I)$ $Al$ has greater affinity than that of $Cr$ , for oxygen

$(II)$ $Al$ can be used for reduction of $Fe_2O_3$

$(III)$ Carbon is used for reduction of $PbO$

$(IV)$ $SnO_2$ can be reduced by carbon

Choose the correct set of statement $(s)$

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The byproduct in the extraction of iron is

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A metal has a high concentration into the earth crust and whose oxides cannot be reduced by carbon. The most suitable method for the extraction of such metal is

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Consider following statements

$(i)$ Froth floatation technique is used to concentrate sulphide ore.

$(ii)$ Froth floatation technique is based upon differential wettability of ore and impurity in water.

$(iii)$ Red Bauxite is concentrated by Bayer's process

$(iv)$ Carbon is used as reducing agent during extraction of zinc from zinc blende.

Correct statements are

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