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An element will readily form an electrovalent compound if its electron configuration is
The component of an atom that contributes least to its mass is the
Sugar is separated from its impurities by
Which of these properties gives a solid its definite shape?
The shape of the hydrocarbon compound CH\(_4\) is
How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and
The gas that is the most dangerous pollutant to human is
Kerosene is commonly used to remove the red colour stain of palm oil from cloths because it
The air around smelting industries is likely to contain
The solubility curve shows the variation of solute concentration with
25cm\(^3\) of a mixture of noble gases was obtained from air after the removal of other constituents. What was the original volume of air?
When water boilers are used for long period of time, the solid substances left behind as scale are
A substance that is used as a ripening agent for fruits is
Equal moles of ethyne and hydrogen iodide react to give
How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?
In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove
Which of the following are structural isomers?
The decolourization of purple colour of tetraoxomanganate (VII) ion is a test for
The enzymes responsible for converting sucrose into two simple isomeric sugars is