Which of the following do not react with oxygen easily?

Correct! Wrong!

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Gold and platinum are the least reactive metals and do not react with oxygen.

In Bayer’s method, the difference in ____affinity between the ____and gangue is utilized for concentrating the ore.

Correct! Wrong!

In Bayer’s method, the difference in chemical affinity between the bauxite and gangue is utilized for concentrating the ore. In Bayer’s method of separation of aluminium from bauxite ore, Bauxite ore is reacted with hot NaOH. A water soluble sodium aluminate is formed. The gangue is insoluble in NaOH as well as water. The sodium aluminate formed is removed by adding water and filtering the solution.

Oxides of highly reactive metals are reduced by ____.

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Oxides of highly reactive metals are reduced by electrolytic reduction.

Other than ____, all other methods of concentration of ores are correct.

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Reduction is not a method of concentration but a method of reducing the oxide of metal, obtained by one of the concentration methods, to its metal.

In the activity series metals arranged in ____.

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In the activity series metals are arranged in decreasing order of their reactivity. The order is: K > Na > Ca > Mg > Al > Zn > Fe > Pb > Cu > Ag > Au

Which of the following does not give H2 when added to dilute HCl?

Correct! Wrong!

Cu does not give hydrogen when added to HCl, since; Cu is less reactive than hydrogen.

A homogenous mixture of two or more metals or a metal with a non-metal is ____.

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A homogenous mixture of two or more metals or a metal with a non-metal is an alloy.

Zinc can displace hydrogen from HCl because ____.

Correct! Wrong!

Zinc is more reactive than hydrogen and thus, can displace hydrogen from HCl.

Copper sulphate solution turns light green when an iron nail is dipped in it because ____.

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Copper sulphate solution turns light green when an iron nail is dipped in it because iron rusts. Iron displaces copper and forms ferrous sulphate solution which is light green in colour.

The element, which is placed in the reactivity series of metals with non-metallic properties is ____.

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Hydrogen, being a non metal is placed in the activity series of metals, since it can form positive ions like metals.

The process of purifying a metal is called ____.

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The process of purifying a metal is called refining

Which of the following cannot prevent corrosion?

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Covering with glass cannot prevent corrosion. Glass is brittle and cannot be used to prevent corrosion. Painting, anodising and alloying prevent metals from exposure to air and prevent corrosion.

An amalgam is an ____.

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An amalgam is an alloy of a metal and mercury.

The green layer formed on copper vessels that are exposed to air is due to the formation of ____.

Correct! Wrong!

Copper reacts with moist carbon dioxide in air to form copper carbonate and copper hydroxide, A. CuCO3.Cu(OH)2 which is green in colour.

Carbonate ores are converted to oxides by ____.

Correct! Wrong!

Carbonate ores are converted to oxides by calcinations i.e. burning the ore in a limited supply of air.

Other than ____, all other are the methods for removal of unwanted materials (e.g. sand, clays, etc.) from the ore.

Correct! Wrong!

Zone refining is a method for obtaining metals of high purity and not a method for removal of unwanted materials (e.g. sand, clays, etc.) from the ore. It is based on the principle that the impurities are more soluble in the melt, than in the solid state of metal.

Which of the following does not corrode when exposed to air?

Correct! Wrong!

Aluminium does not corrode when exposed to air. This is because aluminium forms a protective oxide layer.

The non-metal which forms an alloy is ____.

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Carbon forms alloys. Carbon is alloyed with iron along with nickel and chromium to form steel.

The thermite process is also known as the ____ process.

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The thermite process is also known as the aluminothermic process. In this process aluminium is used as the reducing agent to reduce metal oxides like iron oxide. This process is exothermic and hence the name aluminothermic process.

Galvanization is the process of coating ____.

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Galvanization is the process of coating iron with zinc. Galvanization is done to prevent corrosion of iron.

The minerals from which metals are extracted profitably are called ____.

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The minerals from which metals are extracted profitably are called ores.

The most abundant non-metal in the earth's crust is ____.

Correct! Wrong!

The most abundant non-metal in the earth's crust is oxygen.

In the froth floatation method, pine oils, fatty acids, xanthates, etc. are ____ whereas cresols and aniline are used as ____.

Correct! Wrong!

In the froth floatation method, pine oils, fatty acids, xanthates, etc. are collectors whereas cresols and aniline are used as froth stabilizers. Collectors enhance non-wettability of the mineral particles and froth stabilizes, stabilize the froth.

Sometimes there are two sulphides in an ore, which are separated by using ____.

Correct! Wrong!

Sometimes there are two sulphides in an ore, which are separated by using depressant. In case of an ore containing ZnS and PbS, the depressant used is NaCN. It prevents ZnS from coming to the froth but allows PbS to come with the forth.

Which of the following can displace zinc from a zinc sulphate solution?

Correct! Wrong!

Magnesium can displace zinc from a zinc sulphate solution. Magnesium is more active than zinc and thus can displace zinc from zinc sulphate.

ICSE Class 10th Chemistry 6 - Metallurgy MCQs
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