21.

Which of the following element is a metalloid?

• Bi

• Sn

• Ge

• C

The vapour pressure will be lowest for :

• 0.1 M sugar solution

• 0.1 M KCl solution

• 0.1 M Cu(NO₃)₂ solution

• 0.1 M AgNO₃ solution

What is the name of element with atomic number 105?

• Kurchatovium

• Dubnium

• Nobelium

• Holmium

Ionisation depends upon :

• pressure

• volume

• dilution

• none of these

Which of the following oxide does not form acidic aqueous solution?

• N₂O₃

• NO₂

• N₂O₅

• NO

Which of the following salt does not get hydrolysed in water?

• KClO₄

• NH₄Cl

• CH₃COONa

• None of these

In the reaction: H₂ + I₂ → HI

In a 2L flask 0.4 moles of each H₂ and I₂ are taken. At equilibrium 0.5 moles of HI are formed. What will be the value of equilibrium constant K_c?

• 20.2

• 25.4

• 0.284

• 11.1

Which among the following elements have lowest value of IE₁?

• Pb

• Sn

• Si

• C

KI and CusO₄ solution when mixed, give :

• CuI₂ + K₂SO₄

• Cu₂I₂ + K₂SO₄

• K₂SO₄ + Cu₂I₂ + I₂

• K₂SO₄ + CuI₂ + I₂

Which of the following is a Lewis base ?

• NaOH

• NH₃

• BCl₃

• All of these