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16. Explain the following:
(3)
(1) Sodium chloride is not a conductor of electricity in solid state where as it does
conduct electricity in aqueous solution as well as in molten state.
(ii) Iron articles are galvanized it geus must
avoid aust
is used
(111) Metals like sodium, potassium, calcium and magnesium are never found in their free
doesnot contain Ht ions.
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nature bcoz
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Answer:
Recall the definition of a variable presented in Section 1.6.
Definition: Variable
A variable is a symbol (usually a letter) that stands for a value that may vary.
Let’s add the definition of a mathematical expression.
Definition: Mathematical Expression
When we combine numbers and variables in a valid way, using operations such as addition, subtraction, multiplication, division, exponentiation, and other operations and functions as yet unlearned, the resulting combination of mathematical symbols is called a mathematical expression.
Thus,
2a, x
Explanation:
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