The molecular formula of ethane is ____.

Correct! Wrong!

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The molecular formula of ethane is C2H6.

Which of the following is an amphoteric oxide?

Correct! Wrong!

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

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.

The valency of carbon is ____.

Correct! Wrong!

The valency of carbon is 4 as it has 4 valence electrons.

Covalent compounds have ____.

Correct! Wrong!

Covalent compounds possess low melting and boiling points.

Which of the following metals are poor conductors of heat?

Correct! Wrong!

Lead and mercury are poor conductors of heat.

When calcium and water are combined ____.

Correct! Wrong!

When calcium and water are combined calcium starts floating. Calcium starts floating on water, since, the bubbles of hydrogen gas formed stick to calcium.

Which one of the following is not a covalent carbon compound?

Correct! Wrong!

Baking soda is not a covalent carbon compound but an ionic compound and its formula is NaHCO3.

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.

The carbon atom can only form ____ bond.

Correct! Wrong!

The carbon atom always forms covalent bond by sharing of electrons.

The electronic configuration of carbon is ____.

Correct! Wrong!

The electronic configuration of carbon is 2, 4.

Which of the following is a liquid at room temperature?

Correct! Wrong!

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

Hydrogen gas is not liberated when metals react with nitric acid because nitric acid is ____.

Correct! Wrong!

Hydrogen gas is not liberated when metals react with nitric acid because nitric acid is an oxidizing agent. Nitric acid oxidizes the liberated hydrogen to water.

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.

Na is stored in kerosene because ____.

Correct! Wrong!

Na is a highly reactive metal and catches fire when exposed to air. It does not react with kerosene. Hence, it is stored in kerosene.

Which of the following symbol represents a single covalent bond?

Correct! Wrong!

A single covalent bond is represented by "−".

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.

Alloy of ____ is used in making aircrafts.

Correct! Wrong!

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

Which of the following is the best conductor of heat?

Correct! Wrong!

Silver is the best conductor of heat.

The number of electrons a carbon atom requires to attain an octet configuration is ____.

Correct! Wrong!

A carbon atom requires 4 electrons to attain an octet configuration.

Which gas is liberated when metals react with acids?

Correct! Wrong!

Hydrogen gas is liberated when metals react with acids.

The cation in MgCl2 is ____.

Correct! Wrong!

The cation in MgCl2 is Mg++.

The number of carbon atoms present in one molecule of ethane is ____.

Correct! Wrong!

One molecule of ethane has 2 carbon atoms.

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

Correct! Wrong!

Carbon exists in different forms.

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.

ICSE Class 10th Chemistry 2 - Chemical Bonding-Ionic and Covalent Compounds MCQs
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