Although Diamond is Covalent, yet it has high melting point. Why?
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Although coal and petroleum are produced by degradation of biomass, yet we need to conserve them. Why?..
Both the energy sources, coal and petroleum, take millions of years for their formation. As these resources are being utilised at a much faster rate than their formation, they will...
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What are covalent compounds ? How are they different from ionic compounds ? List any two properties of covalent compounds.
The compounds that are formed due to sharing of electrons between. two atoms/ compounds having covalent bonds. Ionic compounds are formed due to a transfer of electrons from one atom to...
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The index of refraction of diamond is 2.0. The velocity of light in diamond
(a) 1.5 × 1010 cm/sec
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Although the H-bonding in hydrogen fluoride is much stronger than that in water, yet water has a much higher boiling point than hydrogen fluoride.
This is because hydrogen bonding is multidimensional in water whereas in HF it is linear.
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Give reason for the following: (a) LiCl is more covalent than KCl. (b) LiF has lower melting point than NaCl.
(a) Due to smaller size and high poalrising power of Li+ ion ,LiCl is more covalent than KCl. (b) Small cation Li+ ion highly polarizes large anion I-, LiI is more...
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Boron forms :- (a)Covalent compounds only (b)Ionic compounds only (c)Ionic as well as covalent compounds
(a) Covalent compounds only
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Give reasons for the following : (i) Ionic compounds have high melting point and boiling point.
(i) A large amount of energy is required to break the strong inter-ionic attraction. (ii) When ionic compounds is present in molten state, crystal structure deforms and they can easily conduct...
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‘Although tin roofs are given to springing unaccountable leaks, there is a feeling of being untouched by, and yet in touch with, the rain.’
(i) The word ‘springing’ means ‘to develop suddenly’. The writer says that tin roofs are prone to developing unexpected leaks. (ii) The writer was physically untouched by the rain as the...
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What are covalent compounds? How are they different from ionic compounds? List any two properties of covalent compounds.
(a) The compounds that are formed due to the sharing of electrons between two atoms/compounds having covalent bonds. (b) Ionic compound are formed due to the transfer of electrons from one atom...
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Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.
Hint: (i) Wood produces lot of air pollution. (ii) Use of wood as fuel encourages cutting of trees leading to deforestation.
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