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Chemistry

Chemistry
The apparatus used to test acidity of aqueous solution is

Hygrometer
PH meter
Ammeter
Acidmeter

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Chemistry
Match the List-I with List-II and select the correct answer using the codes given below the listsList-I (Green house gas)List-II(Major source)F.Carbondioxide1.Enteric fermentation in cattleG.Methane2.Burning of fossilH.Chloroflro carbons3.Mercury compounds in waste waterJ.Nitrous oxide4.Nylon production 5.Air conditioner and refrigeration unitsCodes :FGHJA.2154B.3421C.3241D.1234

D
C
A
B

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Chemistry
The mass number of an atom is equal to

the number of protons
the number of nucleons
the number of protons and electrons
the number of neutrons

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Chemistry
The most abundant element in the human body is

Oxygen
Iron
Carbon
Nitrogen

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Chemistry
Submarines move under water. They have engines that run on

Petrol and oxygen
Steam
Diesel
Batteries

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Chemistry
An emulsion is a colloidal solution of

Solid in Solid
Gas in solid
Solid in liquid
Liquid in liquid

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