Check MCQ Questions for Class 11 Chemistry Chapter 11 The p-Block Elements with Answers from CBSE section on e akhabaar
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The p-Block Elements Class 11 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
Which of the following is not a protonic acid?
(a) B(OH)3
(b) PO(OH)3
(c) SO(OH)2
(d) SO2(OH)2
Answer
Answer: (a) B(OH)3
Question 2.
Which of the following is an amphoteric oxide?
(a) B2O3
(b) ZnO
(c) Na2O
(d) SO2
Answer
Answer: (b) ZnO
Question 3.
Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(a) Has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
(b) Is a non-crystalline substance
(c) Is an allotropic form of carbon
(d) Has molecules of variable molecular masses like polymers.
Answer
Answer: (a) Has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
Question 4.
An aqueous solution of borax is
(a) Basic
(b) Acidic
(c) Neutral
(d) Amphoteric
Answer
Answer: (a) Basic
Question 5.
Orthoboric acid when heated to red heat gives
(a) Metaboric acid
(b) Tetraboric acid
(c) Boron trioxide
(d) Borax
Answer
Answer: (c) Boron trioxide
Question 6.
Boric acid is polymeric due to
(a) Its acidic nature
(b) The presence of hydrogen bonds
(c) Its monobasic nature
(d) Its geometry
Answer
Answer: (b) The presence of hydrogen bonds
Question 7.
Which of the following statements about boric acid is false?
(a) It acts as a monobasic acid
(b) It is formed by the hydrolysis of boron halides
(c) It has planar-structure
(d) It acts as a tribasic acid.
Answer
Answer: (d) It acts as a tribasic acid.
Question 8.
From B2H6 all the following can be prepared except
(a) H3BO3
(b) B2(CH3)4H2
(c) B2(CH3)6
(d) NaBH4
Answer
Answer: (d) NaBH4
Question 9.
When formic acid is treated with cone evolved is
(a) H2S
(b) SO2
(c) CO
(d) CO2
Answer
Answer: (c) CO
Question 10.
The type of hybridisation of boron in diborane is
(a) sp
(b) sp²
(c) sp³
(d) sp³d²
Answer
Answer: (c) sp³
Question 11.
Among the following, electron-deficient compound is
(a) CCl4/sub>
(b) PCl5
(c) BeCl2
(d) BCl3
Answer
Answer: (d) BCl3
Question 12.
Diamond and graphite are
(a) Homologues
(b) Allotropes
(c) Isomers
(d) None of the above
Answer
Answer: (b) Allotropes
Question 13.
Which of the following is the hardest substance known?
(a) Graphite
(b) Carborundum
(c) Diamond
(d) Coke
Answer
Answer: (c) Diamond
Question 14.
Thermodynamically the most stable form of carbon is
(a) Diamond
(b) Graphite
(c) Peat
(d) Coal
Answer
Answer: (b) Graphite
Question 15.
Which of the following is the most commonly used refrigerant?
(a) CFCl3
(b) CCl3Br
(c) CF3Cl
(d) CF2Cl2
Answer
Answer: (d) CF2Cl2
Question 16.
Carbon forms a large number of compounds because it has
(a) Variable valency
(b) Low electron affinity
(c) High ionisation energy
(d) Property of catenation
Answer
Answer: (d) Property of catenation
Question 17.
Which of the following allotropic forms of carbon is isomorphous with crystalline silicon?
(a) Graphite
(b) Coal
(c) Coke
(d) Diamond
Answer
Answer: (d) Diamond
Question 18.
In graphite electrons are
(a) Localised on every third atom
(b) Present in antibonding orbitals
(c) Localised on each carbon atom
(d) Spread out between the structure.
Answer
Answer: (d) Spread out between the structure.
Question 19.
Percentage of lead in lead penceakhabaar is
(a) Zero
(b) 20
(c) 80
(d) 70
Answer
Answer: (a) Zero
Question 20.
The correct structure of Fe(CO)5 is
(a) Octahedral
(b) Tetrahedral
(c) Square planar
(d) Trigonal bipyramid
Answer
Answer: (d) Trigonal bipyramid
Question 21.
Which is strongest lewis acid?
(a) BF3
(b) BCl3
(c) BBr3
(d) BI3
Answer
Answer: (d) BI3
Question 22.
White lead is
(a) Pb3O4
(b) PbO
(c) 2PbCO3.Pb(OH)2
(d) Pb (CH3COO)2.Pb(OH)2
Answer
Answer: (c) 2PbCO3.Pb(OH)2
Question 23.
Which of the following oxidation states are the most characteristic for lead & tin respectively
(a) +2, +2
(b) +4, +2
(c) +2, +4
(d) +4, +4
Answer
Answer: (c) +2, +4
Fill in the blanks
Question 1.
……………… is the most stable allotrope of carbon at high temperature.
Answer
Answer: Graphite
Question 2.
One recently discovered allotrope of carbon (e.g. C60) is commonly known as ………………
Answer
Answer: Fullerene
Question 3.
Cassiterite is an ore of ………………
Answer
Answer: Tin
Question 4.
The hydrolysis of alkyl substituted chlorosiianes gives ………………
Answer
Answer: Silanols
Question 5.
The hydrolysis of tri alkyl chloro silane R3 SiCl yields ………………
Answer
Answer: Silicones
Question 6.
The two types of bonds present i n B2H6 are covalent & ………………
Answer
Answer: three-centre bond
Question 7.
……………… + ………………
Answer
Answer: NaBO2 & B2O3
Question 8.
Boron exists in nature as ………………
Answer
Answer: Tincal (Borax)
Question 9.
Boron is used as to ……………… in nuclear reactors.
Answer
Answer: Control neutron flux
Question 10.
Boric acid contains planar ……………… units.
Answer
Answer: BO(_3^2-)
Write True / False
Question 1.
The tendency for catenation is much higher for C than tor Si.
Answer
Answer: True
Question 2.
Carbon monoxide is used as an oxidising agent in metallurgical operations.
Answer
Answer: False
Question 3.
Gaseous carbon dioxide can be directly solidified.
Answer
Answer: True
Question 4.
Boron can expand it’s valence shell to accommodate more than 8 elements.
Answer
Answer: False
Question 5.
Boric acid (H3BO3) is a monobasic acid.
Answer
Answer: True
Question 6.
Boron does not form ionic compounds.
Answer
Answer: True
Question 7.
Carbon is the most abundant element on the earth.
Answer
Answer: False
Question 8.
Solidified carbon dioxide is called dry ice.
Answer
Answer: True
Question 9.
Fullerene is a molecular substance.
Answer
Answer: True
Question 10.
CO2 is more acidic than CO.
Answer
Answer: True
Match the Following
Column I | Column II |
1. Boron | (a) [Ne]3s²p1 |
2. Aluminium | (b) [He] 2s²p1 |
3. Carbon | (c) [Ne]3s²p² |
4. Silicon | (d) [Ar] 3d104s²p1 |
5. Gallium | (e) [He] 2s²p² |
6. H3BO3 | (f) Hydrogen bonds |
7. An aqueous solution of borax | (g) Monobasic & weak Lewis acid |
8. Elements of group 14 | (h) Basic |
9. Boric acid is polymeric due to | (i) Graphite |
10. Thermodynamically the most stable form of C. | (j) Exhibit oxidation state of +2 & +4 |
Answer
Answer:
Column I | Column II |
1. Boron | (b) [He] 2s²p1 |
2. Aluminium | (a) [Ne]3s²p1 |
3. Carbon | (e) [He] 2s²p² |
4. Silicon | (c) [Ne]3s²p² |
5. Gallium | (d) [Ar] 3d104s²p1 |
6. H3BO3 | (g) Monobasic & weak Lewis acid |
7. An aqueous solution of borax | (h) Basic |
8. Elements of group 14 | (j) Exhibit oxidation state of +2 & +4 |
9. Boric acid is polymeric due to | (f) Hydrogen bonds |
10. Thermodynamically the most stable form of C. | (i) Graphite |
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