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प्रश्न
Define Photochemical reaction
Give an example
उत्तर
It is a reaction which occurs with absorption of light energy.
\[\ce{6CO2 + 6H2O -> C6H12O6 + 6O2}\]
APPEARS IN
संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
Name three reducing agents ?
Fill in the blank:
The substances which undergo chemical change are called _______
Balance the following equation :
Fe + H2O → Fe3O4 + H2
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)
Rusting of iron is a ______ chemical change.
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
What do you observe? When
Barium chloride is added to sodium sulphate solution
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
______ gas causes tears in our eyes while cutting onions.
_____ is the basic material to manufacture urea.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Rusting of iron is ______.
