Metals and Non-metals

Which of the following is the best conductor of heat?

Correct! Wrong!

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Silver is the best conductor of heat.

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.

Which of the following is an amphoteric oxide?

Correct! Wrong!

ZnO is an amphoteric oxide since, it has both acidic and basic properties.

Which of the following statements is not correct with respect to non-metals?

Correct! Wrong!

Absence of free electrons or ions in non-metals makes them bad conductors of heat and electricity.

Which of the following cannot prevent corrosion?

Correct! Wrong!

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.

The thermite process is also known as the ____ process.

Correct! Wrong!

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.

Which of the following is a liquid at room temperature?

Correct! Wrong!

Mercury is the only metal that is liquid at room temperature.

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

Correct! Wrong!

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

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.

School bells are made of metals because metals are ____.

Correct! Wrong!

School bells are made of metals because metals are sonorous. They have a property to produce sound on striking.

Ionic compounds conduct electricity in aqueous solution, because they ____.

Correct! Wrong!

Ionic compounds form ions in an aqueous solution; these ions move freely and conduct electricity.

Which gas is liberated when metals react with acids?

Correct! Wrong!

Hydrogen gas is liberated when metals react with acids.

Galvanization is the process of coating ____.

Correct! Wrong!

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

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.

Which of the following metals are poor conductors of heat?

Correct! Wrong!

Lead and mercury are poor conductors of heat.

The non-metal which forms an alloy is ____.

Correct! Wrong!

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

Which of the following do not react with oxygen easily?

Correct! Wrong!

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

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.

Alloy of ____ is used in making aircrafts.

Correct! Wrong!

An alloy of aluminium, duralumin is used in of making aircrafts.

Metals react with non-metals to form ionic compounds by ____.

Correct! Wrong!

Metals react with non-metals to form ionic compounds by transfer of electrons.

The cation in MgCl2 is ____.

Correct! Wrong!

The cation in MgCl2 is Mg++.

Which of the following are bad conductors of electricity?

Correct! Wrong!

Hg and Pb are bad conductors of electricity since, they offer high resistance to the flow of current.

Which of the following is a correct statement?

Correct! Wrong!

Most of the metals are hard but metals like Na, Mg and K are soft. Hg is the only liquid metal.

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.

Which of the following is the correct reaction for the action of water on sodium?

Correct! Wrong!

When sodium reacts with water, sodium hydroxide and hydrogen gas are formed.

An amalgam is an____.

Correct! Wrong!

An amalgam is an alloy of a metal and mercury.

Which of the following non-metals exist in different states?

Correct! Wrong!

Carbon exists in different forms.

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

Correct! Wrong!

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

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

Correct! Wrong!

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 ____.

Correct! Wrong!

The process of purifying a metal is called refining.

CBSE Class 10th Science 3 - Metals and Non Metals MCQs
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CBSE Class 10th Science 3 - Metals and Non Metals MCQs