When water boilers are used for long period of time, the solid substances left behind as scale are
magnesium trioxosilicate (IV) and rust
magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
clay and magnesium troxosulphate (IV)
clay and rust
Correct answer is A
No explanation has been provided for this answer.
A substance that is used as a ripening agent for fruits is?
ethene
propene
methane
butane
Correct answer is A
- Ethene is a plant hormone which causes fruit to ripen.
- Ethene is used routinely within the food industry to provide controlled ripening during storage and transport or when fruit is displayed in shops, in sealed packages.
Equal moles of ethyne and hydrogen iodide react to give
CH2 = CH2
CH2 - CHI
CH3 - CI
CH2 = CHI
Correct answer is D
No explanation has been provided for this answer.
Two
Three
Four
One
Correct answer is A
No explanation has been provided for this answer.
water
basic impurities
acidic impurities
ethoxyethane
Correct answer is C
No explanation has been provided for this answer.