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Q89) Graphite is a soft solid lubricant extremely difficult to melt. THe reason for this anomalous behavior is that graphite .. [ AIEEE 2003]




SOLUTION


Answer: (d)


Q90) A fibrous material which can withstand red hot flames without ant damage is




SOLUTION


Answer: (c)


Q91) In laboratory silicon can be prepared by the reaction of ..



SOLUTION

SiO2 + Mg → Si + MgO2
Answer:(a)



Q92) Which of the following conceivable structures for CCL4 will have a zero dipole moment?



SOLUTION

In CCL4 C is sp3 thus have regular tetra hedron shape and net moment is zero because of symmetric distribution of Cl
Answer: (d)


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