Which of the following is a Lewis base ?

• NaOH

• NH₃

• BCl₃

• All of these

Wave nature of electrons was demonstrated by :

• Schrodinger

• De-Broglie

• Davisson and Garmer

• Heisenberg

Distribution law was given by :

• Henry

• Vant Hoff

• Nernst

• Ostwald

The bond order of O₂⁺ is the same as in :

• N₂⁺

• CN^-

• CO

• NO⁺

A gas can expand from 100 mL to 250 mL under a constant pressure of 2 atm .The work done by gas is :

• 30.38 joule

• 25 joule

• 5 k joule

• 16 joule

If the r.m.s. speed of a gaseous molecule is x m/sec at a pressure P atm , then what will be the r.m.s. speed at a pressure 2P atm and constant temperature ?

• x

• 2x

• 4x

• x/4

17.

Which among the following is the strongest acid ?

• HF

• HCl

• HBr

• HI

How does the ionisation energy of 1st group elements vary ?

• Increases down the group

• Decreases down the group

• Remains unchanged

• Variation is not regular

What type of hybridisation takes place in the N atom of NH₃ ?

• sp²

• sp³

• dsp²

• sp

Water gas is :

• CO + N₂

• CO + CO₂ + CH₄

• CO₂ + N₂

• CO + H₂