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Question
State if the following element or radical is divalent?
Chromium
Solution
Chromium element or radical is not divalent.
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Tick (√) the correct answer.
The sulphate radical is written as S042-. What is the formula of calcium sulphate ?
A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced at the positive electrode whereas gas Z is obtained at the negative electrode. Moreover, gas Y supports combustion whereas gas Z burns itself causing explosions.
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- Which law of chemical combination is illustrated by this example ?
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- State an important use of Y in our life.
Define ‘formula mass’ of a compound.
Name the particle which has 18 electrons, 18 neutrons and 17 protons in it.
The valencies (or charges) of some of the ions are given below :
Ion Valency Ion Valency (Charge) (Charge)
Sodium ion 1+ Nitrate ion 1–
Copper ion 2+ Sulphide ion 2–
Using this information, write down the formulae of :
- Sodium sulphide
- Copper nitrate
Give example.
Basic radicals
What do you understand by the following terms?
Basic radical
Select the correct answer to the statement given below:
An elementary particle of matter – of a group of atoms of different elements behaving as a single unit with charge on the group.
State if the following element or radical is divalent?
Ammonium
State if the following element or radical is divalent?
Permanganate
