Valency of oxygen is $2$.

Important Questions on Matter and Chemical Formulae

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q C

The number of atoms of each element should be same on each side of a balanced equation.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q D

Match the following:

1	Iron	a	$\mathrm{C}\mathrm{u}$
2	Copper	b	$\mathrm{M}\mathrm{g}{\left(\mathrm{O}\mathrm{H}\right)}_2$
3	Sodium Oxide	c	$\mathrm{A}\mathrm{g}$
4	Magnesium hydroxide	d	$\mathrm{F}\mathrm{e}$
5	Silver	e	$\mathrm{N}\mathrm{a}\mathrm{O}$

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

Name the subatomic particles present in an atom.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

Is gold an element or a compound?

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

Write the valencies of copper, nitrogen and sulphur.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

Name the element represented by the symbol $\mathrm{C}\mathrm{l}$.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

Name the compound having the chemical formula ${\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}}_3$

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

Name the elements present in $\mathrm{M}\mathrm{g}\mathrm{O}.$