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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
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उत्तर
Rusting
Reason: Rusting is undesirable change. Others three are desirable changes.
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Name three reducing agents ?
What do you observe when :
an iron nail is kept in tap water for few days
State four conditions necessary for a chemical reaction to take place.
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
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)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
Define an electrochemical reaction.
Give an example of the following chemical change.
Two solids combine to form a liquid
Name the gases which turn moist red litmus blue.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
Analogy:
H2O: Water:: NaCl: ______.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Give two examples for the following case:
Chemical changes
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
______ is the chemical name of rust.
______ is a chemical substance is used in whitewashing.
