Chemistry Past Questions

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2841

Which statement is NOT true about the composition of starch?

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2842

Chlorine is used in water purification because it

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2843

The number of hydrogen ions in 1.0dm\(^3\) of a 0.25 mole tetraoxosulphate(Vl) acid solution is
[Avogadro constant = 6.02 x 10\(^{23}\)]

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2844

B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has

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2845

The boiling point of water is higher than the boiling point of ethanol because

A. the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent
B. the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules
C. water has a higher lattice energy than ethanol.
D. water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules;
E. water is a better solvent than ethanol.

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