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How are the elements with variable valency named? Explain with an example.
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The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Chloride
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The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Oxide
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The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Phosphate
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The formula of the sulphate of an element M is M2(SO4)3
Write the formula of its
Acetate
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Fill in the blank:
Dalton used symbol _____ for oxygen and _____ for hydrogen.
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Fill in the blank:
Symbol represents _____ atom(s) of an element.
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Fill in the blank:
Symbolic expression for a molecule is called _____.
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Name the sub-atomic particle whose charge is 0.
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Name the three fundamental particles of an atom.
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The atomic number of an element is more important to the chemist than its relative atomic mass. Why?
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Complete the table:
|
Atomic number |
Element |
Electronic configuration |
Select an element of the same group |
|
11 |
Sodium |
|
(Ca/N/K)… |
|
15 |
Phosphorus |
|
(Ba/N/Rb)… |
|
16 |
Sulphur |
|
(F/Cl/O)… |
|
9 |
Fluorine |
|
(Ca/Cl/K)… |
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Relative atomic mass of a light element up to calcium is approximately ______ its atomic number.
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An element A has 2 electrons in its fourth shell. State:
its atomic number
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Write a balanced equation for the following:
Iron reacts with dil. HCl
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From the knowledge of activity series, name a metal which shows the following properties
It reacts readily with cold water
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From the knowledge of activity series, name a metal which shows the following properties:
It displaces hydrogen from hot water.
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From the knowledge of activity series, name a metal which shows the following properties:
It displaces hydrogen from dilute HCl.
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From the knowledge of activity series, name a metal which shows the following properties:
It forms a base which is insoluble in water.
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Complete the following word equation:
Calcium + water → calcium hydroxide + _________
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