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प्रश्न
Balancing a chemical equation is based on
विकल्प
Law of conservation of mass
Mass of reactants and products
Symbols and formulae
None of the above
उत्तर
Law of conservation of mass.
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संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
FILL IN THE BLANK
Positively charged ions are called ........
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
True or false
New substances are formed in a chemical change.
A chemical equation is a statement that describes a chemical change in terms of
Explain the following reaction with one suitable example of Double decomposition reaction.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
What is a chemical change? Give two examples of chemical change?
Name the gases which Turn moist red litmus blue.
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The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
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Electrolytic decomposition of water is a reaction involving change of state.
Name the following:
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Copper carbonate to copper oxide
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Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Burning of paper is a ______ change.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings
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.
When magnesium is burnt in the air, a new substance is formed which is ______.
Write the characteristics of chemical change.
Photosynthesis is a chemical charge. Justify your answer.
______ is the chemical name of slaked lime.
