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प्रश्न
______ gas causes tears in our eyes while cutting onions.
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उत्तर
Propanethial s-oxide gas causes tears in our eyes while cutting onions.
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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
Define electrolysis.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Give an example of a photochemical reaction.
Name: A brown gas
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give a chemical test to distinguish between the following gases.
HCl and H2S
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Silver metal can displace hydrogen gas from nitric acid.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
______ is the chemical name of limestone.
