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प्रश्न
Which of the following symbols of elements are incorrect? Give their correct symbols
- Cobalt CO
- Carbon c
- Aluminium AL
- Helium He
- Sodium So
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उत्तर
- Cobalt – Co
- Carbon – c
- Aluminium – A1
- Helium – He (correct)
- Sodium – Na
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संबंधित प्रश्न
Give the symbols and valencies of following radicals:
(a) Hydroxide (b) Chloride
(c) Carbonate (d) ammonium
(e) Nitrate
Explain the significance of the symbol H.
Why is the symbol S for sulphur, but Na for sodium and Si for silicon?
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
State the type of element for the following:
Chlorine
State the type of element for the following:
Silicon
Give the formula of the following gas:
Nitric oxide
Select the correct answer to the statement given below:
An element present in the earth’s crust, atmosphere and the human body.
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Silver
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).
Zincate
