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Chemistry

Chemistry
Which substance is used to retard the setting action of cement?

CaO
Na2O + K2O
CaSO4, 2H2O
Al2O3

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Chemistry
The purest form of Iron is :

Cast iron
Pig iron
Steel
Wrought iron

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Chemistry
The constituents of automobile exhaust that can cause cancer is/are :

Polycyclic hydrocarbons
Lead
Oxides of nitrogen
Carbon monoxide

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Chemistry
Milk is a natural

Solution
Emulsion
Suspension
Mixture

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Chemistry
Type metal used in printing press is an alloy of

Lead and copper
Lead and antimony
Lead and bismuth
Lead and zinc

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Chemistry
What material is used to make electric heater coil ?

Copper
Silver
Iron
Nichrome

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