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प्रश्न
Balancing a chemical equation is based on
पर्याय
Law of conservation of mass
Mass of reactants and products
Symbols and formulae
None of the above
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उत्तर
Law of conservation of mass.
APPEARS IN
संबंधित प्रश्न
The chemical name of baking soda is ______.
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
What are biocatalysts ?
How is precipitate formation in a chemical reaction indicated?
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
State four conditions necessary for chemical reactions to take place.
Write true or false .
A black residue is formed when sugar is heated .
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Give an example of the following chemical change.
Two gases combine to form white solid
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
______ is a natural indicator.
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?
