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प्रश्न
What are oxides ?
उत्तर
An oxide is a compound which essentially contains oxygen in its molecule, chemically combined with a metal or a non-metal
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Complete and balance the following chemical equations:
N2 + O2 →
Fill in the blank.
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Give reason.
Wasp sting is treated with vinegar.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
Write true or false .
A black residue is formed when sugar is heated .
A chemical equation is a statement that describes a chemical change in terms of
Explain the following reaction with one suitable example of Displacement reaction.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
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Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Choose the correct option from the bracket and explain the statement giving reason.
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Light
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Two solids combine to form a liquid
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NaOH + HCl → NaCl + H2O
Define:
Electrochemical reaction
Give one example
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
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Shake the gas with red litmus solution |
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Shake the gas with blue litmus solution |
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Apply a burning splint to a gas |
What do you observe when Cobalt chloride paper is introduced in water vapour.
Complete the table given below.
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What happens when cane sugar is strongly heated? Mention any two changes in it.
The chemical change is ______.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
What is the role of a catalyst in a chemical reaction?
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
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Write some materials prepared by chemical changes.
Classify the following as physical or chemical properties
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