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Answered on 14/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Ramakrishna Dhooli

Tutor

a) SiO2
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Answered on 13/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Explain the differences in properties of diamond and graphite based upon their structures. read more

Explain the differences in properties of diamond and graphite based upon their structures. read less

Lokesh Pratap

diamond structure is closely packed while graphite layers are weak
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Answered on 13/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Boron has an extremely high melting point because of (a) its ionic crystal structure (b) the strong... read more
Boron has an extremely high melting point because of
(a) its ionic crystal structure
(b) the strong binding forces in the covalent polymer
(c) atomic size (d) allotropy read less

Lokesh Pratap

b
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Answered on 11/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Which of the following compound is an important catalyst as well as a Lewis acid? (a) AI2S2 (b) BF3 (C) S4N4 (d) N2H4 read more
Which of the following compound is an important catalyst as well as a Lewis acid?
(a) AI2S2 (b) BF3 (C) S4N4 (d) N2H4 read less

Abhishek Gupta

Go for b
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Answered on 12/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Carbon-60 contains (a) 20 pentagons and 12 hexagons (b) 12 pentagons and 20 hexagons (c) 30 pentagons... read more
Carbon-60 contains
(a) 20 pentagons and 12 hexagons (b) 12 pentagons and 20 hexagons
(c) 30 pentagons and 30 hexagons (d) 24 pentagons and 36 hexagons read less

Riya Group

B answer is correct
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Answered on 13/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Which of the following is the most ionic? (a) CCl4 (b) PbCl2 (c) PbCl4 (d) SiCl4 read more
Which of the following is the most ionic?
(a) CCl4 (b) PbCl2 (c) PbCl4 (d) SiCl4 read less

Sujit Dutta

CCl4 is most ionic.
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Answered on 14/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Which of the following molecules have zero dipole moment? (a) CS2 (b) CO2 (c) CCl2 (d) CH2Cl2 read more
Which of the following molecules have zero dipole moment?
(a) CS2 (b) CO2 (c) CCl2 (d) CH2Cl2 read less

Prayas S.

Tutor

(b) CO2
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Answered on 13/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Silicon shows a diagonal relation with
(a) magnesium (b) phosphorous (c) carbon (d) boron

Kanojiya suraj

Tutor

Diagonal relationship between Boron and Silicon. Due to its small size andsimilar charge/mass ratio, boron differs from other group 13 members, but it resembles closely with silicon, the second element of group 14 to exhibit diagonal relationship.
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Answered on 12/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Why do Boron halides form addition compound with NH3?

Vikas Kumar Shukla

It can be explained on the basis of pka value but at your level it is explain in easy way. Here acid base reaction not possible because AMMONIA acts as a base so, ammonia give electron to the electron deficient Boron halides and give a addition product.
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Answered on 12/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Assign appropriate reason for each of the following observations:- (i) Anhydrous AlCl3 is used as a catalyst... read more
Assign appropriate reason for each of the following observations:-
(i) Anhydrous AlCl3 is used as a catalyst in many organic reactions.
(ii) No form of elemental silicon is comparable to graphite. read less

Shikshayatan

answer to the first question Anhydrous AlCl3 is a lewis acid as the Al has its sextet fulfilled. This makes the compound electron loving. In many organic reactions it is used to separate compounds like Cl2 into Cl+ and Cl- which would help in the aromatic electrophillic substitution, which otherwise... read more

answer to the first question 

Anhydrous AlCl3 is a lewis acid as the Al has its sextet fulfilled. This makes the compound electron loving. In many organic reactions it is used to separate  compounds like Cl2 into Cl+ and Cl- which would help in the aromatic electrophillic substitution, which otherwise would have formed Cl free radical owing to homolytic fission.

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