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प्रश्न
Give reason.
Acidic soil is treated with quick lime.
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उत्तर
If the soil is acidic it can be treated with base like quick lime, to make it neutral.
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Fill in the blank:
The substances which undergo chemical change are called _______
A chemical equation is a statement that describes a chemical change in terms of
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 white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Define an electrochemical reaction.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
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.
NH3 and HCl
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
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 sodium chloride | Colour imparted to flame during flame test |
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
______ change results in the change of the substance.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
