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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 18/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Give reasons: (a) Why do Boron halides form addition compound with NH3? (b) The tendency for catenation... read more
Give reasons:
(a) Why do Boron halides form addition compound with NH3?
(b) The tendency for catenation decreases down the group in Group 14.
(c) PbO2 is a stronger oxidising agent than SnO2. read less

Virendra Singh Tyagi

A) BCl3 is electron deficient element so it can accept the lone par of ammonia and form addition compound. B) down the group tendency to form the covalent bond is decrease so the due to large size and less ionisation potential hence,
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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 16/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

The diamond molecule contains (a) sp2-hybridized carbon atoms connected by single bonds (b) sp2-hybridized... read more
The diamond molecule contains
(a) sp2-hybridized carbon atoms connected by single bonds
(b) sp2-hybridized carbon atoms connected by double bonds
(c) sp3-hybridized carbon atoms connected by single bonds
(d) sp3-and sp2-hybridized carbon atoms connected by single bonds read less

Mukesh Sahu

Computer Science|B.Tech|Class X-XII(PCM) - IIIT|NIT

Answer: (c) In diamond, each C-atom forms four sigma bonds with one S and three P atomic orbitals. If this answer was helpful for you, then please click on the like icon. Thanks.
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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 10 Feb CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Silicon carbide (SiC) is known as (a) quartz (b) tridynite (c) corundum (d) carborundum read more
Silicon carbide (SiC) is known as
(a) quartz (b) tridynite (c) corundum (d) carborundum read less

Kella Ramana

Carborundum ( SiC )
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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 22/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Give reason for the following observations:- (a) The tendency for catenation decrease down the group... read more
Give reason for the following observations:-
(a) The tendency for catenation decrease down the group in Group 14.13.
(b) The decreasing stability of+3 oxidations state with increasing atomic number in group (c)Molten aluminium bromide is a poor conductor of electricity. read less

Ujjwal Rana

Masters in Chemistry with 2 year experience

a) Down the group atomic size increases, it is difficult for large size atoms to form stable bonds among themselves so down the group catination tendency decreases. b) Due to inert pair effect as we go down the group lower O.S. becomes more stable compared to higher ones, so +3 O.S . stability decreases... read more

a) Down the group atomic size increases, it is difficult for large size atoms to form stable bonds among themselves so down the group catination tendency decreases.

b) Due to inert pair effect as we go down the group lower O.S. becomes more stable compared to higher ones, so +3 O.S . stability decreases and +1 increases.

c) AlBr3 is a covelent compound so in molten state it don't break into ions, thus it is poor conductor of electricity.

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Answered on 27/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Give the chemical reaction as an evidence for each of the following observations. (i) Tin (II) is a reducing... read more
Give the chemical reaction as an evidence for each of the following observations.
(i) Tin (II) is a reducing agent whereas lead (II) is not.
(ii) Gallium (I) undergoes disproportionation reaction.

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Paras V.

Tutor

(i) Due to inert pair effect pb2+ is more stable than Pb 4+. Whereas Sn4+ is more stable than Sn2+ . (ii) 3Ga+ → 2Ga + Ga3+ This is because Ga3+ is more stable than Ga+ .
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Answered on 13 Jan CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Prabhakar J.

Butene-2 ( β elimination reaction)
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