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प्रश्न
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
How do the following help in bringing about a chemical change?
pressure.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Define a photochemical reaction.
Define an electrochemical reaction.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
______ gas causes tears in our eyes while cutting onions.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Burning of paper is the best example of ______ change.
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
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?
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
