The P Block Elements
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Draw the structures of BCl3.NH3 and AlCl3 (dimer).
Draw the structures of BCl3.NH3 and AlCl3 (dimer).
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The central B atom in BCl3 has six electrons in its valence shell. As a result, it is an electron-deficient molecule in need of two more electrons to complete its octet. To put it another way, BCl3 acts as a Lewis acid. NH3 on the
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A tetravalent element forms monoxide and dioxide with oxygen. When air is passed over a heated element (1273 K), producer gas is obtained. Monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and reduction of ferric oxide with the monoxide
A tetravalent element forms monoxide and dioxide with oxygen. When air is passed over a heated element (1273 K), producer gas is obtained. Monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and reduction of ferric oxide with the monoxide
This is a Long Answers Type Questions as classified in NCERT Exemplar
2C (s) + O2 + 4N2 (g) 
2CO (g) + 4N2 ( g)
Fe2O3 (S)+3CO (g) 
2Fe (S)+3CO2
C= tetravalent carbon
CO= carbon monoxide
Fe2O3= ferric oxide
CO2= carbon dioxide
Tetravalent elements
Upvote A non-metallic element of group 13, used in making bullet proof vests is an extremely hard solid of black color, It can exist in many allotropic forms and has unusually high melting points. Its trifluoride acts as Lewis acid towards ammonia. The element exhibits a maximum covalency of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why the trifluoride acts as a Lewis acid
A non-metallic element of group 13, used in making bullet proof vests is an extremely hard solid of black color, It can exist in many allotropic forms and has unusually high melting points. Its trifluoride acts as Lewis acid towards ammonia. The element exhibits a maximum covalency of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why the trifluoride acts as a Lewis acid
This is a Long Answers Type Questions as classified in NCERT Exemplar
Boron is the only non-metallic and extremely hard element in group 13, and it is also used to make bulletproof vests. Boron exists in a variety of allotropic forms. It usually has a high melting point and no d orbital. Using 2s and
Upvote A compound (A) of boron reacts with NMe3 to give an adduct (B) which on hydrolysis gives a compound (C) and hydrogen gas. Compound (C) is an acid. Identify the compounds A, B and C. Give the reactions involved.
A compound (A) of boron reacts with NMe3 to give an adduct (B) which on hydrolysis gives a compound (C) and hydrogen gas. Compound (C) is an acid. Identify the compounds A, B and C. Give the reactions involved.
This is a Long Answers Type Questions as classified in NCERT Exemplar
B2H6 + 2NMe3→ 2BH3NMe3 BH3NMe3+H2O → H3BO3 + NMe3 + 6H2
(A) (B)
Upvote (i) What are silicones? State the uses of silicones. (ii) What are boranes? Give chemical equation for the preparation of diborane.
(i) What are silicones? State the uses of silicones. (ii) What are boranes? Give chemical equation for the preparation of diborane.
This is a Long Answers Type Questions as classified in NCERT Exemplar
(i) Organosilicon polymers having (R2SiO2) as monomer units are called silicones. Silicones contain organic side groups which surround it giving alkane like nature and makes it hydrophobic. Silicones are applicative in electrical
Upvote Boron fluoride exists as BF3 but boron hydride doesn't exist as BH3. Give reason. In which form does it exist? Explain its structure.
Boron fluoride exists as BF3 but boron hydride doesn't exist as BH3. Give reason. In which form does it exist? Explain its structure.
This is a Long Answers Type Questions as classified in NCERT Exemplar
In BF3, due to n−pπ back bonding between the vacant p-orbital of boron and filled p-orbital of fluorine. This Π− pπ back bonding is absent in case of hydrogen as it is a single electron element.
Two BH3 molecules dimerise to form di
Upvote BCl3 exists as monomer whereas AlCl3 is gimerised through halogen bridging. Give reason. Explain the structure of the dimer of AlCl3 also.
BCl3 exists as monomer whereas AlCl3 is gimerised through halogen bridging. Give reason. Explain the structure of the dimer of AlCl3 also.
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Both the compounds, BCl3 and AlCl3 are electron deficient compounds. In BCl3, boron is smaller in size and cannot assemble four big chlorine atoms near it causing steric hindrance and making it unstable.
Hence, BCl3 exists as a mono
Upvote Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 elements in a more stable oxidation state. Give reason for your choice. State the nature of bonding also.
(i) TlCl3 ,TlCl (ii) AlCl3, AlCl (iii) InCl3, InCl (iv) What are boranes? Give chemical equation for the preparation of diborane.
Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 elements in a more stable oxidation state. Give reason for your choice. State the nature of bonding also.
(i) TlCl3 ,TlCl (ii) AlCl3, AlCl (iii) InCl3, InCl (iv) What are boranes? Give chemical equation for the preparation of diborane.
(i) TlCl is more stable than TlCl3, due to inert pair effect, +1 oxile. oxidation state.
(ii) AlCl3, Al3+ is more stable than aluminum ions in +1 state.
(iii) Due to the inert pair effect, +1 oxidation state is more stable than the +3 oxidation state. So, InCl is more st
Upvote When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature? Explain.
When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature? Explain.
This is a Long Answers Type Questions as classified in NCERT Exemplar
When aqueous solution of borax is acidified with hydrochloric acid, boric acid is produced. As the name says, boric acid is acidic in nature but weak acid. Unlike protonic acid, boric acid is monobasic acid. It accepts electrons fr
Upvote 3. When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature? Explain.
3. When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature? Explain.
This is a Long Answers Type Questions as classified in NCERT Exemplar
When aqueous solution of borax is acidified with hydrochloric acid, boric acid is produced. As the name says, boric acid is acidic in nature but weak acid. Unlike protonic acid, boric acid is monobasic acid. It accepts electrons fr
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