Redox Reactions

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.

Zinc can displace hydrogen from HCl because ____.

Correct! Wrong!

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

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.

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

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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 entire scientific and technological process used for isolation of the metal from its ores is known as ____.

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The entire scientific and technological process used for isolation of the metal from its ores is known as metallurgy.

____ is the process of reducing metal oxide with carbon in the presence of flux.

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Smelting is the process of reducing metal oxide with carbon in the presence of flux.

Which of the following method is used to concentrate iron ore haematite?

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Iron ore(Haematite) is concentrated by: 1. Hydraulic washing 2. Magnetic separation.

Cast iron is an example of ____ alloy.

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Cast iron is an ferrous alloy.

The process of purifying a metal is called ____.

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The process of purifying a metal is called ____.

____ is not an ore of aluminium.

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Cinnabar is an ore of mercury.

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 ____.

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

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 extraction and isolation of metals from ores involve the major steps given in the options below. One of the steps is not applicable to all the ores. Find the odd one out.

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Electrolysis is the odd one out, as it is not used for all the elements.

The process of heating the ore to high temparatures in absence of air to remove impurities such as moisture , sulphur , arsenic and Carbon dioxide is called ____ .

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The process of heating the ore to high temparatures in absence of air to remove impurities such as moisture , sulphur , arsenic and Carbon dioxide is called Calcination .

____ is not an ore of iron .

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Dolamite is ore of Magnesium.

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.

An amalgam is an ____.

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An amalgam is an alloy of a metal and mercury.

The undesired material which is present with the element in its ore is known as ____.

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The undesired material which is present with the element in its ore is known as gangue.

Carbonate ores are converted to oxides by ____.

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

Which of the following is not the characteristic of alloy ?

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Alloys are inert to commonly used chemicals such as Sulphuric acid , hydrochloric acid and sodium hydroxide.

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

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

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.

Which of the following do not react with oxygen easily?

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

A few elements like carbon, sulphur, gold and noble gases, occur in ____ state while others in ____ form, in the earth’s crust.

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A few elements like carbon, sulphur, gold and noble gases, occur infree state while others in combined form in the earth’s crust.

Oxides of highly reactive metals are reduced by ____.

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Oxides of highly reactive metals are reduced by electrolytic reduction.

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

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

____ is alloy of mercury.

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Zinc amalgam is an alloy of zinc and mercury.

Bauxite ore is concentrated by ____ process.

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Bauxite ore is concentrated by Bayer's or Hall's process.

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