Question

2. The value of frequency and voltage of the electricity,supplied to homes in India are
a) 50 Hz 1 220 V
b) 50 Hz a 110 v
c) 60 Hz 31 220 V
d) 60 Hz 3i 110 V
3. Refer the given representation of pH scale and answer the following questions​

Answer 1

1. a) 50 Hz 1 220 V

2. On pH scale 7 is the neutral

pH<7 acidic nature

pH>7 basic nature

Explanation:

1.

The frequency of electricity supply in India is 50 Hz and a voltage of 220 volts for the domestic supply.

• 50 Hz supply means that the direction of current alters 50 times in a second for the alternating current we use here. This variation is in the form of sinusoidal oscillations.

Some countries of the world also use 60 Hz frequency as a standard electric supply in their country.

TOPIC: frequency of current, voltage, domestic supply of electricity

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2.

pH scale is a scale in chemistry marked from 0 to 14, used to measure the acidity or basicity of a water based solution. pH scale is inversely proportional and logarithmic representation of the concentration of hydrogen ions.

• We measure the pH at standard temperature of 25°C.

• If the value obtained is equal to 7 then the solution is neutral.

• If the solution is having pH less than 7 it is acidic and if greater than 7 it is basic in nature.

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TOPIC: pH scale, acidity, basicity,

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