Chemical change and chemical bond

Combustion of fuel is of __________ and irreversible change

• Fast

• Slow

• None

What is a natural chemical change

• Respiration

• Combustion of fuels

• Softening of hard water

The two different types of chemical bonds are

• Ionic and covalent bond

• Anions and cations bond

• Valent and covalent bond

This type of chemical bond occurs when an electron is gained or lost by an atom of an element

• Covalent

• Ionic

• Cations

The chemical bond formed due to an electrostatic force of attraction between the oppositely charged cation and anion is called

• Ionic compound

• Electrovalent bond

• Electrostatic bond

What is used to clean Shahabad tile

• Sulphuric acid

• hydrochloric acid

• Citric acid

Which type of chemical bond occurs when electrons are shared by atoms of at least two different elements

• Valent bond

• Ionic bond

• Covalent bond

In the equation c+o2➡️ Co2 which of them are the reactants

• C+02

• None

• Co2

• Both

A colourless solution of calcium hydroxide in a test tube turns ____________ after blowing in it trough a blow tube for some time

• stays the same

• Turns red

• Turns yellow

• Become milky

water is a covalent bond

• True

• False