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प्रश्न
Select the correct answer from the choice in the bracket.
The formula of caustic soda.
पर्याय
KOH
Ca(OH)
NaOH
उत्तर
NaOH
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संबंधित प्रश्न
Give two symbols which have been derived from the "English names" of the elements.
The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Oxide
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.
Hydrogen by ‘H’
Match the noble gases – with their correct symbols:
| Noble gases | Symbols |
| (a) Helium | (1) Ar |
| (b) Neon | (2) Xe |
| (c) Argon | (3) Rn |
| (d) Krypton | (4) He |
| (e) Xenon | (5) Kr |
| (f) Radon | (6) Ne |
Give the symbol of the following element:
Phosphorus
Write the chemical formula of the following:
calcium sulphide
Name the following:
An acid whose formula is ‘H2CO3’.
Which of the following would weigh the highest?
Mass of one atom of oxygen is
