Question

formulae of simple compound​

Answer 1

Answer:

The symbols of the elements can be used to represent compounds e.g. FeS, NaCl, KBr and H2O. These are called chemical formulae. In the first three examples, the ratio of the elements in each compound is 1:1.

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2.4 Names and formulae of substances (ESAAC)

Compound ion Chloride

Formula Cl−

Compound ion Peroxide

Formula O2−2

Explanation:

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Answer 2

Question :

The length and breadth of a rectangular piece of land are in the ratio of 5:3. If the total cost

of fencing it at 24 per metre is 9600, find its length and breadth.

Answer .

here is ur answer ....

Ratio in length and breadth of a rectangular piece of land = 5 : 3

Cost of fencing = ₹ 9600

And rate = ₹ 24 per m

Perimeter = Total cost of fencing/Rate per m = 9600/24 = 400 m

Let length = 5x

Then breadth = 3x

∴ Perimeter = 2(l + b)

400 = 2 × (5x + 3x)

∴ 16x = 400

x = 400/16 = 25

(i) ∴ Length of land = 5x = 5 × 25 = 125 m

And breadth = 3x = 3 × 25 = 75 m

(ii) Area = l × b

= 125 × 75 = 9375 m2

(iii) Cost of levelling at rate ₹ 60 per m2

= ₹ 60 × 9375 m2 = ₹ 5, 62,500 ans ...

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