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प्रश्न
What does the symbol '⇌' present in a chemical equation, mean?
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उत्तर
'⇌' stands for a reversible reaction.
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संबंधित प्रश्न
Write true or false
Milk is an emulsion.
The symbol of a metal element which is used in making thermometers is :
Explain the terms 'valency' and 'variable valency'.
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Helium by ‘He’
Match the formulas of the following of bases with their correct names.
Bases – (a) NaOH (b) KOH (c) Ca(OH)2 (d) Zn(OH)2
Names – (1) Potassium hydroxide (2) Zinc hydroxide (3) Aluminium hydroxide (4) Calcium hydroxide (5) Sodium hydroxide
State the type of element for the following:
Chlorine
Write the radical of the following valency:
Sodium
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Mercury
write symbol with the variable valency
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Bisulphite
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Bisulphate
