IGCSE/GCSE/ Chemistry -multiple choice questions.

Front

What is sublimation?

Back

Sublimation is the process in which a solid changes directly into a gas without passing through the liquid state. An example is solid carbon dioxide (dry ice) turning into gas.

Front

What happens when hydrated cobalt(II) chloride is heated?

Back

When hydrated cobalt(II) chloride is heated, it loses water and changes color, indicating a physical change.

Front

What is the purpose of the baseline in paper chromatography?

Back

The baseline is drawn in pencil to ensure it does not dissolve in the solvent, allowing for accurate separation of components.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure the same number of each type of atom on both sides.

Front

What is the formula for calcium phosphate?

Back

The formula for calcium phosphate is Ca3(PO4)2.

Front

What is the correct formula for potassium phosphate?

Back

The correct formula for potassium phosphate is K3PO4.

Front

What is the formula for magnesium nitrate?

Back

The formula for magnesium nitrate is Mg(NO3)2.

Front

What is the incorrect formula among Al3(SO4)2, K3PO4, Mg(NO3)2, and TiCl4?

Back

The incorrect formula is Al3(SO4)2; the correct formula is Al2(SO4)3.

Front

What is chromatography?

Back

Chromatography is a technique used to separate mixtures based on the different rates at which components move through a medium.

Front

What is the role of a solvent in chromatography?

Back

The solvent dissolves the sample and carries it through the medium, allowing for separation of components.