CLASS 9 SECOND TERM EXAM 2077

An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?

• (a) 4th group

• (b) 6th group

• (c) 3rd group

• (d) 2nd group

The arrangement of elements in the Modem Periodic Table is based on their

• (a) increasing atomic mass in the period

• (b) increasing atomic number in the horizontal rows

• (c) increasing atomic number in the vertical columns

• (d) increasing atomic mass in the group

Element ‘X’ forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:

• (a) Si

• (b) Mg

• (c) Al

• (d) Na

Pick out the chemically most reactive elements from the given triads.Li, Na, K F, Cl, Br

• (a) Li and F

• (b) Li and Br

• (c) K and F

• (d) K and Br

The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?

• (a) A and B

• (b) A and C

• (c) B and C

• (d) None

A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?

• (a) MO

• (b) M2O

• (C) M2O3

• (d) MO2

Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.

• (a) Helium

• (b) Argon

• (c) Neon

• (d) Krypton

On moving from left to right in a period in the Periodic table, the size of atom

• Increases

• Decreases

• Does not change appreciably

• First decreases and then increases

Which of the following does a simple machine NOT do?

• Increase the force applied
• Increase the distance the force is applied over
• Change the direction the force is applied
• Change the amount of work that needs to be done

What type of simple machine is found on the cap of a pickle jar?

• lever
• inclined plane
• pulley
• screw