Atoms and Molecules/ Structure of Atom

The chemical formula of Bismuth Phosphate is

• Bi₂(PO₄)₃

• BiPO₄

• Bi₃PO₄

• Bi(PO₄)₃

Number of atoms of O in 34 gram H₂O₂ is

(Given: O = 16 u, H = 1 u)

• N_A

• 2 N_A

• 3 N_A

• 4 N_A

There are -------------- periods and -------------- groups in the modern periodic table.

• 18 periods and 7 groups

• 17 periods and 8 groups

• 7 periods and 18 groups

• 8 periods and 17 groups

How many moles of H atoms are present in 3.011 x 10²³ molecules of ammonia (NH₃)?

• 0.5

• 1

• 1.5

• 2

The atomicity of rhombic sulfur is

• 1

• 2

• 4

• 8

Which of the following is a neutral oxide?

• CO₂

• N₂O₅

• Al₂O₃

• CO

The number of electrons present in the 'L' shell of O is

• 3

• 4

• 5

• 6

The volume of an atom is 10^y times the volume of nucleus. Then y is -------------

• 5

• 10

• 15

• 20

The magnitude of charge to mass ratio of cathode rays is --------------

• constant

• variable

• 1.76 x 10¹¹ C/kg

• Both (A) and (C)

The valency of the halogen present in second period is --------------------

• 1

• 3

• 5

• 7