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Chemistry

Chemistry
The purest form of water in nature is

Rain water
Sea water
Lake water
River water

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Chemistry
"Paramagnetism" is the property of

Completely filled electronics subshells
Paired electrons
Completely vacant electronic subshells
Unpaired electrons

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Chemistry
The polymer used in making plastic crockery is

Melamine
Bakelite
Nylon
Decron

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Chemistry
Which of the following appeared to be with a significant potential for accumulation through food chains ?

Lindane
DDT
Parathion
Carbary

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Chemistry
In which of the following ions , the colour is not due to d-d transition ?

[Cu(NH3)4]2+
[Ti(H2O)6]3+
[CoF6]3+
[CrO4]2−

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Chemistry
What is the most commonly used substance in fluorescent tubes?

Mercury vapour and argon
Sodium vapour and neon
Mercury oxide and neon
Sodium oxide and argon

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