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प्रश्न
______ gas causes tears in our eyes while cutting onions.
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उत्तर
Propanethial s-oxide gas causes tears in our eyes while cutting onions.
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संबंधित प्रश्न
Define precipitation reaction.
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
How is precipitate formation in a chemical reaction indicated?
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
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 |
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
______ change results in the change of the substance.
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(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
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Are these changes chemical in nature?
Iron and rust are the same substances.
Write the chemical reaction of baking soda with lemon.
How would you show that the settling of curd is a chemical change?
Photosynthesis is a chemical charge. Justify your answer.
