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

• N₂ and H₂O

• N₂O and H₂O

• NO₂ and H₂O

• NO and NO₂

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

Ferrous sulphate (${\mathrm{FeSO}}_4·7{\mathrm{H}}_2\mathrm{O}$) is known as

• vermillion

• Glauber's salt

• green vitriol

• Siderite

727.

PCl₃ and cold water reacts to produce which of the following?

• H₃PO₃

• H₃PO₂

• H₄P₂O₇

• H₃PO₄

Which phosphorus reacts with KOH solution to produce phosphene gas?

• White phosphorus

• Red phosphorus

• Both (a) and (b)

• None of these

I₂ dissolves in KI solution due to the formation of :

• KI₂ and I^-

• K⁺, I^- and I₂

• I${}_3^{-}$

• None of these

What are the products obtained when ammonia is reacted with excess chlorine ?

• N₂ and NCl₃

• N₂ and HCl

• N₂ and NH₄Cl

• NCl₃, and HCl