The p-Block Elements

Red lead is

• PbO

• Pb₃O₄

• PbO₂

• Pb₄O₃

Concentrated HNO₃ forms NO${}_2^{+}$ in the presence of

• Conc. H₂SO₄

• Fe

• FeBr₃

• AlCl₃

The key step in the manufacturing of H₂SO₄ by contact process is

• absorption of SO₃ in H₂SO₄ to give oleum

• dilution of oleum with water

• burning of sulphur in air to generate SO₂

• catalytic oxidation of SO₂ with O₂ to give SO₃

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