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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 catalyst.
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Write a short note on the information derived from a balanced chemical equation.
A chemical equation is a statement that describes a chemical change in terms of
Match the column in the following table.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Give an example of a reaction where the following are involved
Light
Give an example of a reaction where the following are involved
Electricity
Give an example of a reaction where the following are involved
Catalyst
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Give one example electrochemical reaction.
What do you observe when H2S is passed through a lead nitrate solution.
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 coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Silver articles turning black: ______:: Boiling of H2O: physical 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.
What changes do you expect?
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?
