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Chemistry

Chemistry
Citric acid is present in free form in

Tamarind
Apple
Milk
Lemon

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Chemistry
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

0.01 minute
13 days
3 billion years
100 years

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Chemistry
"Paramagnetism" is the property of

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

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Chemistry
Which method will be employed to test the hardness of water?

None of these
Boiling
Formation of lather with soap
Distillation

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Chemistry
The hydronium ion is

H3O+
H2+
HO -
H+

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Chemistry
Which of the following electrodes is used in strongly alkaline solution

Mercury - mercurous chloride electrode
Mercury - mercurous sulphate electrode
Silver - silver chloride electrode
Mercury - mercuric oxide electrode

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