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प्रश्न
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
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उत्तर
The basic conditions necessary for a chemical reaction is close contact .
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
FILL IN THE BLANK
Positively charged ions are called ........
| 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 |
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Sodium chloride
Explain the term reactant and product giving examples.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
What do you understand by 'chemical reaction'?
What do you observe? When
Barium chloride is added to sodium sulphate solution
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
Circle the odd one out. Give reason for your choice
________ is a chemical substance which alters the speed of a chemical reaction.
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.
Write a word equation for the chemical change, if any.
Which is used as a catalyst during the process of hydrogenation of oils?
______ is a chemical substance is used in whitewashing.
Acid rain is a result of ______.
