9th Class Chemistry MCQs

Atom which loses two electrons from its outer shell to form ion is called?

1. Oxygen
2. Potassium
3. Magnesium
4. Carbon

In NaCl crystal lattice each Na ion is surrounded by:

1. 6 Cl^- ions
2. 6 Na^+ ions
3. 8 Cl^- ions
4. 12 Cl^- ions

Tendency of atoms to acquire eight electrons in their valence shell is:

1. Octet rule
2. Duplet rule
3. Triplet rule
4. None of above

Nobel gases are stable because they contain:

1. 4 electrons in valence shell
2. 6 electrons in valence shell
3. 8 electrons in valence shell
4. 10 electrons in valence shell

Bond which involve 3 shared electron pairs is a:

1. Double covalent bond
2. Single covalent bond
3. Triple covalent bond
4. None of above

A non-metal atom form anion by:

1. Loses of electrons
2. Gain of electrons
3. Loses of protons
4. Gain of protons

The molar mass of H2SO4 is:

1. 98 a.m.u
2. 9.8 gm
3. 98 gm
4. 9.8 a.m.u

When two identical atoms share electron pairs and exert force on each other than bond form is:

1. Non-polar covalent bond
2. Polar covalent bond
3. Double covalent bond
4. Coordinate covalent bond

Synthetic resins are used on places where:

1. Electric resistance is required
2. Water resistance is required
3. Adhesion is required
4. Friction is required

Oxygen belongs to group VIA so number of electrons in its valence shell are:

1. 3
2. 4
3. 5
4. 6