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NEET Chemistry MCQ
Boron Family Mcq Neet Chemistry
Quiz 4
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Q.1
Which of the following statement is not true for diborane
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a) When methylated it produces Me4B2H2
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b) All bond length B-H are equal
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c) Two boron atoms and four terminal hydrogen atoms lie in same plane
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d) Two bridging hydrogen atoms lie symmetrically above and below the plane of formed by B and Four H
Explanation
Answer:(b)
Q.2
Boron compounds behave as Lewis acid because of their ....
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a) Acidic nature
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b) Electron deficiency
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c) Ionic property
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d) Smaller size
Explanation
Answer: (b)
Q.3
Treatment of concentrated solution of borax with calculated quantity of H2SO4 gives
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a) H3BO3
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b) H2B4O7
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c) HBO2
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d) B2O3
Explanation
Na2B4O7 + H2SO4 + 5H2O → Na2SO4 + 4H3BO3 Answer: (a)
Q.4
When powdered borax is heated strongly in Bunsen-flame it gives...
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a) B2O3
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b) NaBO2
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c) B2O3 + NaBO2
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d) Na2B4O7
Explanation
Na2B4O7 → 2NaBO2 + B2O2 Mixture of product i called as transparent bead Answer: (c)
Q.5
Anhydrous AlCl3 is prepared from ... [ MP CET 1998]
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a) Concentrated HCl and Al metal
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b) Aluminium and Cl2
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c) Dry HCl and heated Al metal
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d) Dil HCl and Al metal
Explanation
Answer:(c)
Q.6
BF3 molecule has planar structure . Correct explanation for this is ...
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a) BF3 is sp3 hybridised
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b) BF3 is sp2 hybridised
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c) BF3 is sp hybridised
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d) BF3 spd2 hybridised
Explanation
Answer: (b)
Q.7
Which of the element have highest melting point/
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a) B
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b) Al
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c) Ga
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d) Tl
Explanation
Answer: (a)
Q.8
Which of the following statement is not correct? Boron differs from the other members of the group because..
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a) has much lower atomic radius
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b) is a non metal
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c) Has a maximum covalency 6
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d) is covalent in all its compound
Explanation
Maximum covalency of boron is 4 Answer: (c)
Q.9
The bond angle Cl - B - Cl in BCl3 is
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a) 60°
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b) 109° 7'
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c) 120°
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d) 90°
Explanation
Answer:(c)
Q.10
Which of the following is used in high temperature thermometry?
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a) Hg
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b) Ga
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c) Ca
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d) Sn
Explanation
Ga remains in liquid state at temperature 2000° Other are solid at room temperature Answer: (b)
Q.11
hich of the following reaction is not shown by both "B" and "Al"
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a) They react with HCl to form chloride
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b) They burn in oxygen to give give oxide at higher temperature
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c) Their halides are Lewis acids
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d) They combine with nitrogen to form nitride
Explanation
They react with HCl to form chloride is not shown by both "B" and "Al". B being non metal do not react with HCl to form chloride but shows by "Al" Answer: (c)
Q.12
Which of the following is a Lewis acid?
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a) PCl3
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b) AlCl3
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c) TiCl3
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d) NCl3
Explanation
AlCl3 being electron deficient acts as Lewis acid Answer: (b)
Q.13
Which of the following is most abundant in earth's crust
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a) Na
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b) Ca
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c) Al
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d) C
Explanation
Al is third most abundant after O and Si Answer:(c)
Q.14
Thermite is a mixture of iron oxide and
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a) Zinc powder
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b) Aluminium powder
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c) Copper metal
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d) Sodium metal
Explanation
Answer: (b)
0 h : 0 m : 1 s
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