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

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

• 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

544.

 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

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

• Cl₂>Br₂>F₂>I₂

• Br₂>I₂>F₂>Cl₂

• F₂>Cl₂>Br₂>I₂

• F₂>Cl₂>Br₂>I₂

Among the following, the correct order of acidity is

• HClO<HClO₂<HClO₃<HClO₄

• HClO₂<HClO<HClO₃<HClO₄

• HClO₄<HClO<HClO <HClO₃

• HClO₄<HClO<HClO <HClO₃

Which of the following options represents the correct order? 

• O₂^-> O₂>O₂⁺

• O₂^-<O₂<O₂⁺

• O₂^->O₂<O₂⁺

• O₂^->O₂<O₂⁺

Nitogen dioxide and sulphur dioxide have some properties in common. which property is shown by one of these, comounds but not the order? 

• Forms acid -rain

• Is a reducing -agent

• Is a soluble in water

• Is a soluble in water

The maximum bond angle at nitrogen is present in which of the following?

• NO₂

• NO₂^-

• NO₂⁺

• NO₂⁺