Ammonia on reaction with chlorine forms an explosive NCl₃. What is themole ratio of NH₃ and Cl₂ required for this reaction?

• 8:3

• 1:1

• 1:3

• 10:1

Xenon reacts with fluorine at 873 Kand 7 bar to form XeF₄. It his reaction, the ratio of xenon and fluorine required is

• 1:5

• 10:1

• 1:3

• 5:1

X reacts with dilute nitric acid to form 'laughing gas'. What is X ?

• Cu

• P₄

• S₈

• Zn

In Haber's process, 50.0 g of N₂(g) and 10.0 g of H₂(g) are mixed to produce NH₃ (g). What is the number of moles of NH₃ (g) formed?

• 3.33

• 2.36

• 2.01

• 5.36

For car battery which one is correct statement?

• cathode is lead dioxide (PbO₂) and anode is copper (Cu).

• cathode is copper (Cu) and anode is lead dioxide (PbO₂)

• cathode is copper (Cu) and anode is lead (Pb)

• cathode is lead dioxide (PbO₂) and anode is lead (Pb)

Which among the following is the strongest acid?

• HF

• HCl

• HBr

• HI

Which of the following is the most basic oxide?

• SO₃

• SeO₃

• PoO

• TeO

the correct order of the oxidation states of nitrogen in NO, N₂O, NO₂ and N₂O₃ is

• NO₂ < NO < N₂O₃ < N₂O

• N₂O < N₂O₃ < NO < NO₂

• N₂O < NO < N₂O₃ < NO₂

• NO₂ < N₂O₃ < NO < N₂O

539.

Consider the van der walls constants, a and b, for the following gases

Gas	Ar	Ne	Kr	Xe
a/ (atm dm6 mol-2)	1.3	0.2	5.1	4.1
b/ (10-2 dm3 mol-1)	3.2	1.7	1.0	5.0

Which gas is expected to have the highest critical temperature?

• Kr

• Ar

• Ne

• Xe

The oxoacid of sulphur that does not contain bond between sulphur atoms is :

• H₂S₂O₃

• H₂S₂O₇

• H₂S₄O₆

• H₂S₂O₄