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Chemistry

Chemistry
The substance which does not expand on going from liquid state to solid state is

Cast-iron
Water
Type metal
Aluminium

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Chemistry
Silver nitrate solution is kept in brown bottles in laboratory because

Brown bottles stops the passage of light through it
Brown bottles do not react with it
Brown bottles react with it
It reacts with ordinary white bottles

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Chemistry
The most commonly used chemicals in the artificial rainmaking or cloud seeding are

Dry Ice (Frozen CO2)
Sodium Chloride (NaCl)
Silver Iodide (Ag I)
All of these

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Chemistry
The percentage of nitrogen present in ammonium sulphate is :

0.18
0.305
0.27
0.25

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Chemistry
Match the List-I with List-II and select the correct answer using the codes given belowList-I (Vitamin)List-II(Chemical compound)F.Vitamin A1.ThiaminG.Vitamin B12.RetinolH.Vitamin C3.Ascorbic acidJ.Vitamin E4.TocopherolCodes :FGHJA.4132B.2314C.4312D.2134

C
A
B
D

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Chemistry
Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?

Methane
Hydrogen
Helium
Nitrogen

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