Chemistry - General Knowledge Questions and Answers

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The most electropositive elements among the following is

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The method that cannot be used for removing permanent hardness of water is

adding sodium carbonate

distillation

adding caustic soda

boiling

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The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

3 billion years

100 years

0.01 minute

13 days

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The gas used for artificial ripening of green fruit is

ethylene

ethane

carbon dioxide

acetylene

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Zone refining is used for the purification of

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The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

cineole

engenol

geraniol

limonene

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The molecule which has the highest percentage of ionic character among the following is

HCI

HBr

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The high reactivity of fluorine is due to

its high electro negativity

small size of fluorine atom

availability of d-orbitals

strong F - F bond

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The iron ore magnetite consists of

Fe₂O₃

Fe₃OH₄

FeCO₃

3Fe₂O₃ .. 3H₂O