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Chemistry

Chemistry
0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

4
3
7
6

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Chemistry
Cyanide poisoning causes death in seconds because

It causes cardiac arrest
It causes Lysis of red blood cells
It breaks the electron transport chain
It denatures enzymes of the heart/muscle

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

13
3
8
5

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Chemistry
The method that cannot be used for removing permanent hardness of water is

distillation
adding sodium carbonate
boiling
adding caustic soda

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Chemistry
Which of the following is used to increase the anti-knocking property of petrol ?

Triethyl lead
Tetramethyl lead
Trimethyl lead
Tetraethyl lead

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Chemistry
A fertile soil is likely to have a pH of

14
9
43989
3

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