Q. 37 B5.0( 6 Votes )
In what form do noble gases occur in nature?
The atoms of only a few elements are chemically unreactive which are called noble gases (such as helium, neon, argon etc.). They exist in the free state (as single atom).
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Write the chemical formula using criss-cross method:
(a) Ammonium sulphate
(b) Magnesium bicarbonate
(c) Barium nitrate
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Calculate the molecular mass of ethanoic acid, CH3 COOH.
(Atomic masses: C = 12 u; H = 1 u; O = 16 u)Lakhmir Singh & Manjit Kaur - Chemistry
Which of the following represents a correct chemical formula? Name it.
(d) NaSNCERT Science - Exemplar
Give the formulae of the compounds formed from the following sets of elements
(a) Calcium and fluorine
(b) Hydrogen and sulphur
(c) Nitrogen and hydrogen
(d) Carbon and chlorine
(e) Sodium and oxygen
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Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).Lakhmir Singh & Manjit Kaur - Chemistry
The valencies (or charges) of some of the ions are given below:
Using this information, write down the formulae of:
(i) Sodium sulphide
(ii) Copper nitrateLakhmir Singh & Manjit Kaur - Chemistry