CBSE Class 12 Chemistry D And F Block Elements Worksheet Set 03

Class 12 Chemistry Practice Set: Unit 4 The d- and f-Block Elements

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The p- Block Elements
 
Multiple Choice Questions:
 
1 Acid used in storage batteries
a) H2SO3      b)H2SO4      c)HClO4      d)HCl
 
2 Radioactive halogen is
a) F              b) Cl            c) I            d)At
 
3 Which among the following oxidizes water to oxygen?
a) F2             b)Cl2          c)Br2          d)I2
 
4 Which is most reactive among the following?
a) Cl2           b) Br2         c)I2           d) ICl
 
5 Sulphur is present in
a) Phosgene     b) tear gas     c) mustard gas     d) phosphine
 
6 Which statement is incorrect about noble gases?
a) They have low boiling point
b) Weak Van der Waals forces
c) Negative electron gain enthalpy values
d) Completely filled valence orbitals
 
Fill in the blanks:
 
1 _______ is used in the estimation of carbon monoxide.
 
2 ClF3 is _____shaped and contains___lone pairs
 
3 _____, a noble gas, used in MRI systems.
 
4 Stable allotrope of sulphur at room temperature________.
 
5 Catalyst used in the preparation of sulphuric acid by contact process______.
 
Assertion[A] & Reasoning[R]-
 
(A) Both assertion and reason are correct statements, and the reason is the correct explanation of the assertion
 
(B) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion
 
(C) Assertion is correct, but reason is wrong statement
 
(D) Assertion is wrong, but reason is correct statement
 
(E) Both assertion and reason are wrong statements
 
1 [A]: Reaction of fluorine are exothermic.
[R]: Fluorine has small size and forms strong bonds with other elements.
 
2 [A]: Ozone is thermodynamically stable.
[R]: Decomposition of ozone releases heat and increases entropy
 
3 [A]: Oxygen gas is diamagnetic
[R]: Oxygen contains odd number of electrons.
 
4 [A]: H2Te is most acidic among hydrides of group 16 elements.
[R]: Bond dissociation enthalpy decreases as we go down the group.
 
Answer the following :
 
1. Fluorine does not exhibit any positive oxidation state. Why?
 
2. Name a compound in which chlorine displays ‘+7’ oxidation number.
 
3. Give reason
 
a. Noble gases form compounds with oxygen and fluorine only.
 
b. H2S is gas while water is liquid at room temperature
 
c. Helium is used in diving apparatus.
 
d. Iron dissolves in HCl to form FeCl2 and not FeCl3.
 
e. Sulphur in vapour state exhibits paramagnetic behavior
 
f. XeF2 has a linear shape and not a bent structure
 
g. SF4 is hydrolyzed whereas SF6 is not easily hydrolyzed.
 
h. H2S is less acidic than H2Te.
 
i. Bleaching by Cl2 is permanent but by SO2 is temporary
 
4. Give equations for the manufacture of a) Sulphuric acid b) Chlorine
 
5. Arrange the following in order of the property mentioned
 
a) HF, HCl, HBr, HI (increasing acid strength)
 
b) HOCl, HOClO, HOClO3 (increasing oxidizing power)
 
6. What are interhalogen compounds? How are they prepared? Why are they more reactive than molecular halogens?
 
7. Complete the following reactions
 
a. Cl2 + NaOH (hot, Con) →
 
b. S8 + HNO3(conc.) →
 
c. C + H2SO4 (conc.) →
 
d. O3 + I- + H2O →
 
8. Account for the following
 
a. Reducing character decreases from SO2 to TeO2.
 
b. HClO4 is a stronger acid than HClO.
 
c. Fluorine is a stronger oxidizing agent than chlorine.
 
d. S has greater tendency for catenation than O.
 
e. Bond dissociation energy of F2 is less thanCl2
 
9. Draw the structures of the following
 
a. H2S2O8
 
b. XeOF4
 
c. XeF2
 
d. BrF3

 

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Exam Preparation Worksheet for Class 12 Chemistry Unit 4 The d- and f-Block Elements

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