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प्रश्न
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
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उत्तर
The formation of gas bubbles in a liquid during a reaction is called effervesence
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संबंधित प्रश्न
The chemical name of baking soda is ______.
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
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)
Rusting of iron is a ______ chemical change.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
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.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
What do you observe? When
Water is added to the quick lime.
What do you observe when HCI is passed through a silver nitrate solution.
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Write some materials prepared by chemical changes.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
The chemical formula of rust is ______.
Write the chemical reaction of baking soda with lemon.
______ is the chemical name of slaked lime.
