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प्रश्न
Circle the odd one out. Give reason for your choice
पर्याय
Growth of a child
Blinking of eye
Rusting
Germination of a seed
उत्तर
Rusting
Reason: Rusting is undesirable change. Others three are desirable changes.
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संबंधित प्रश्न
TRUE \ FALSE
Copper can displace iron from iron sulphate.
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
Write true or false :
Hydrogen sulphide has rotten egg smell .
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Sodium chloride
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Give an example of a reaction where the following are involved
Heat
Give an example of the following chemical change.
Two gases combine to form white solid
Name: Two nitrates that do not produce nitrogen dioxide on heating.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
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 coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
______ gas causes tears in our eyes while cutting onions.
Write some materials prepared by chemical changes.
Which of the following statement is incorrect for a chemical reaction?
Rusting of iron is ______.
