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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 .
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Explain the type of reactions on the basis of the direction of reaction.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Balancing a chemical equation is based on
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Explain the following reaction with one suitable example of Double decomposition reaction.
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
State the main characteristics of chemical reactions. Give at least one example in each case.
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Give a chemical test to distinguish between the following gases.
H2 and CO2
Give a chemical test to distinguish between the following gases.
NH3 and SO2
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
______ change results in the change of the substance.
Analogy:
H2O: Water:: NaCl: ______.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
