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

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

The minimum amount of O₂(g) consumed per gram of reactant is for the reaction :
(Given atomic mass : Fe = 56, O=16, Mg=24, P= 31, C=12, H=1)

• 2Mg(s) + O₂(g) → 2MgO (s)

• 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)

• P₄(s) + 5O₂(g) → P₄O₁₀(s)

• C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O (l)

The number of pentagons in C₆₀ and trigons (triangles ) in white phosphours, respectively ,are :

• 20 and 4

• 20 and 3

• 12 and 4

• 12 and 3

1128.

Match the compounds given in column I with the hybridization and shape given in column II and mark the correct option.

Column I	Column II
A.XeF6	1.Distorted octahedral
B.XeO3	2.Square planar
C.XeOF4	3.Pyramidal
D.XeF4	4.Square pyramidal

• A

  B

  C

  D

    1       2     4      3

• A

  B

  C

  D

   4       3      1      2

• A

  B

  C

  D

    4      1      2      3

• A

  B

  C

  D

    4      1      2      3

 Which is the correct statement for the given acids?

• Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.

• phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid

• Both are triprotic acids

• Both are triprotic acids

The product obtained as a result of a reaction of nitrogen with CaC₂ is 

• CaCN

• CaCN₃

• Ca₂CN

• Ca₂CN