31.

Wave nature of electrons was demonstrated by :

• Schrodinger

• de-Broglie

• Davisson and Garmer

• Heisenberg

The bond order of O${}_2^{+}$ is the same as in:

• N${}_2^{+}$

• CN^-

• CO

• NO⁺

Which of the following dissolves in hot conc. NaOH solution?

• Fe

• Zn

• Cn

• Ag

Sodium pyrophosphate is represented by which of the following formula ?

• Na₂P₂O₄

• Na₄P₂O₅

• Na₄P₂O₇

• Na₂P₂O₅

Which one of the following can produce hydrogen when treated with metallic sodium?

• (CH₃)₂NH

• CH₃NH₂

• C₆H₅NH₂

• CH₃CONH₂

Which gas is evolved by the treatment of magnesium with very dilute solution of HNO₃?

• N₂

• NO₂

• H₂

• H₂O

How many neutrons are present in tritium nucleus?

• 2

• 3

• 1

• 0

The total number of protons in 10g of calcium carbonate is (N₀ = 6.023 x 10²³):

• 3.01 × 10²⁴

• 4.06 × 10²⁴

• 2.01 × 10²⁴

• 3.02 × 10²⁴

The high boiling point of water is due to which reason:

• co-ordinate bonding

• covalent bond

• electrostatic force of attraction

• hydrogen bonding

The purest form of coal is :

• peat

• anthracite

• bituminous

• lignite