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प्रश्न
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
उत्तर
Ammonium chloride [NH4Cl].
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
How do the following help in bringing about a chemical change?
light.
How do the following help in bringing about a chemical change?
heat.
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
Name three reducing agents ?
Fill in the blank.
Melting of ice is a _______ change.
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.
Explain by writing a word equation.
Respiration is a chemical change.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Give an example of a reaction where the following are involved:
Close contact
Give an example of the following chemical change.
Two gases combine to form white solid
Give a chemical test to distinguish between the following gases.
H2 and CO2
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
A chemical reaction is often accompanied by external indications or characteristics.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
NPK are the primary nutrients for plants.
Which of the following statement is incorrect for a chemical reaction?
The chemical name of baking soda is sodium bicarbonate.
