The p-Block Elements Test

Directions For Questions

The chemistry of halogens is interesting. Halogens belong to the group 17 of the periodic table. The name Halogen was introduced by J.S.C. Schweiggen in 1811 to describe the property of chlorine (at that time unique among the elements) to combine directly with metals to give salts. Iodine is an essential trace element for humans and plays an important role in growth regulating hormone thyroxine, which is produced in the thyroid gland. Deficiency of iodine in diet leads to Goitre. In order to prevent this condition, about 0.01% $$NaI$$ is added to the table salt. Iodine is a lustrous solid and sublimes at ordinary temperature.

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The p-Block Ele...

Question 1

Calcium

Sodium

Cobalt

Iron

Question 2

reduction of sodium nitrite or sodium nitrate by the reaction of zinc dust and sodium hydroxide

hydrolysis of calcium cyanamide

heating ammonium chloride with slaked lime

heating of $$(NH_4)_2Cr_2O_7$$

Question 3

$$-289^oC$$

$$-299^oC$$

$$-199^oC$$

$$-189^oC$$

Question 4

$$F_{2} > Cl_{2} > Br_{2} > I_{2} $$(Reducing power)

$$Cl_{2}< F_{2} < Br_{2} < I_{2}$$ (Reactivity)

$$I_{2} > Br_{2} > F_{2}> Cl_{2}$$(Bond length)

$$Cl_{2} > Br_{2} >F_{2} >I_{2}$$ (Bond dissociation enthalpy)

Question 5

high electron affinity.

high heat of dissociation and low heat of hydration.

low heat of dissociation and high heat of hydration.

high heat of dissociation and high heat of hydration.

Question 6

d c b a

d c a b

c d b a

c d a b

Question 7

Ionic solvent-solute interaction

Charge-transfer phenomenon

Van der Waals interaction

Dissociation of iodine

Question 8

At the corners of a cube

At the corners of an octahedron

At the corners of a tetrahedron

At the centre and corners of a tetrahedron

Question 9

$$1$$

$$2$$

$$4$$

$$5$$

Question 10

$$Ne$$

$$Ar$$

$$He$$

$$Kr$$

$$Xe$$

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