The solubility curve shows the variation of solute concentration with?
A. volume B. temperature C. vapour density D. pressure Correct Answer: Option B – temperature
25cm³ of a mixture of noble gases was obtained from air after the removal of other constituents. What was the original volume of air?
A. 2,500 cm³ B. 1250 cm³ C. 125 cm³ D. 80 cm³ Correct Answer: Option A – 2,500 cm³ Explanation Percentage of noble gases in air is 1% 25 = (1/100) X T ∴ T = 25 100 = 2500 cm³
When water boilers are used for long period of time; the solid substances left behind as scale are?
A. magnesium trioxosilicate (IV) and rust B. magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI) C. clay and magnesium troxosulphate (IV) D. clay and rust Correct Answer: Option A – magnesium trioxosilicate (IV) and...
Equal moles of ethyne and hydrogen iodide react to give?
A. CH2 = CH2 B. CH2 – CHI C. CH3 – CI D. CH2 = CHI Correct Answer: Option D = CH2 = CHIProducts
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