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Chemistry

Chemistry
The hottest part of the gas flame is known as

non-luminous zone
luminous zone
dark zone
blue zone

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Chemistry
Lead pencil contains

Ferrous sulphide
Lead
Lead sulphide
Graphite

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Chemistry
Sea water is saltier than rain water because

The air around the sea is saltish
Sea animals are salt producing
Rivers wash away salts from earth and pour them into the sea
Sea beds have salt producing mines

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Chemistry
Silicon is used in

Solar energy devices
Semiconductors
All of these
Transistors

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Chemistry
Total number of halogen elements found in the periodic table is

8
5
3
13

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Chemistry
PH value between 6.5-7.5 makes the soil

Basic
Neutral
Acidic
None of these

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