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What does an upward arrow indicate in chemical reaction?

• Formaton of precipitate

• evolution of chemistry

• evolution of gas

• All of the above

Formation of a precipitate is indicated by a ___

• Upward arrow

• right arrow

• downward arrow

• left arrow

Substances which take part in in a chemical reaction are called the ____

• Reactant

• Product

• Solids

• Chemicals

Substances that are formed as a result of chemical reaction are called _____

• Reactants

• resultant

• precipitate

• Products

• All of the above

What is the chemical formula of sulphuric acid?

• H₂SO₃

• HSO₄

• H₂SO₄

• H₄SO₃

• None of ^above

When a reaction takes place in a liquid medium, the formation of a gas can be easily observed as

• a precipitate.

• an effervescence.

• a deposit.

Colour of barium carbonate is ____.

• White

• green

• yellow

When Copper carbonate (green colour) is heated, it forms

• Copper oxide (black) and Hydrogen gas.

• Copper hydroxide and Carbon dioxide gas.

• Copper oxide (black) and Carbon dioxide gas.

In an exothermic reaction,

• heat is absorbed.

• heat is evolved.

• there is no change in energy.

A ________ is an insoluble solid substance formed when two solutions are mixed.

• deposit

• precipitate

• emulsion