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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
Define precipitation reaction.
What do you observe when iron nail is kept in copper sulphate solution for sometime.
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
When electric current is passed through acidulated water ______ of water takes place.
Give an example of the following chemical change.
A reaction where colour change is noticed
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Burning of paper is the best example of ______ change.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
What is the difference between reactants and products?
