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Chemistry

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

CaO
Na2O + K2O
Al2O3
CaSO4, 2H2O

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Chemistry
Milk is a colloidal system in which:

Fat is dissolved
Water is dispersed in fat
Fat is dispersed in water
Fat and water are dispersed in each other

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Emission spectra
Absorption spectra
Raman spectra
Fluorescence

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Chemistry
Saccharin is made up of

Toluene
Propane
Phenol
Butane

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

adding caustic soda
boiling
adding sodium carbonate
distillation

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Chemistry
The metallic constituents of hard water are :

Calcium, magnesium and iron
Magnesium, tin and iron
Iron, tin and calcium
Magnesium, calcium and tin

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