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Allotropes of Carbon

46. The group...

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46. The group of substances in which at melting point covalent bond becomes weak:- (1) NaCl, KCl, CaCl2 (2) I2(s), CH4(s), dry ice (3) B4C, diamond,SiC (4) All of the above

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Q. The first vertical line in the diagram represents a thermometer with the melting points for ice and dry ice (melting point of ice is greater than that of dry ice) at normal atmospheric pressure. The numbered vertical lines represent possible melting points of both the substances at 10 atmospheric pressure. Which vertical line best represents the melting points of both the substances at 10 atmospheric pressure relative to the respective values at normal atmospheric pressure?
Note : The difference in temperatures are not to the scale.

Q. why diamond has a high melting and boiling point unlike other covalent compounds? And why is it hard?
Is they a difference between strong and weak covalent bonds if any?

Q. The use of common salts, e.g., NaCl or

C a C l_{2}

anhydrous, is made to clear snow on the rods. This causes:

S i C

has higher melting point that

N a C l

S i C

has stronger electronic forces of attraction.

What is the result of mixing 200 g of copper nails at 100⁰C & 200 g ice at 0⁰C.? [cof Copper = 0.4 Jg^-1C^-1].

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