NO₂ is not obtained on heating:

• AgNO₃

• KNO₃

• Cu(NO₃)₂

• Pb(NO₃)₂

Which of the following is a polar molecule?

• BF₃

• SF₄

• SiF₄

• XeF₄

P₄O₁₀ is the anhydride of

• H₃PO₂

• H₃PO₃

• H₃PO₄

• H₄P₂O₇

Of the following acids the one which has the capability to form complex compound and also possesses oxidising and reducing properties is

• HNO₃

• HNO₂

• HCOOH

• HCN

Atoms in a P₄ molecule of white phosphorus are arranged regularly in the following way

• at the corners of a cube

• at the corners of an octahedron

• at the corners of a tetrahedron

• at the centre and corners of a tetrahedron

Which one of the following pairs is obtained on heating ammonium dichromate?

• N₂ and H₂O

• N₂O and H₂O

• NO₂ and H₂O

• NO and NO₂

1307.

When KI is added to acidified solution of sodium nitrite, then

• NO gas is liberated and I₂ is set free

• N₂ gas is liberated and HI is produced

• N₂O gas is liberated and I₂ is set free

• N₂ gas is liberated and HOI is produced

Give the structure of pyrphyuric acid. How would you prepare it? What would you observe when colourless HI is added to pyrphuric acid ?

Which of the following electronic configuration represents noble gas ?

• ns²np⁶

• ns²np⁵

• ns²np⁴

• ns²np³

Which of the following is used in the treatment blood cancer ?

• I¹³¹

• P³²

• Rn

• I¹²⁷