Chemistry in Every Day Life
- Alum is used as
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Alum is used to purify water, as it has the property to coagulate mud particles. It is also antiseptic in nature.
Correct Option: D
Alum is used to purify water, as it has the property to coagulate mud particles. It is also antiseptic in nature.
- Which substance is used to retard the setting action of cement?
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CaSO4, 2H2O (Gypsum) is added to cement clinker to retard setting action of cement.
Correct Option: C
CaSO4, 2H2O (Gypsum) is added to cement clinker to retard setting action of cement.
- What is a mixture of potassium nitrate, powdered charcoal and sulphur called?
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Gun powder is a powdered explosive containing potassium nitrate, powdered charcoal and sulphur.
Correct Option: D
Gun powder is a powdered explosive containing potassium nitrate, powdered charcoal and sulphur.
- Which one of the following is not present in cement ?
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Gypsum is added in calculated quantity in order to adjust the rate of setting of cement. Alum is NOT present in cement.
Correct Option: C
Gypsum is added in calculated quantity in order to adjust the rate of setting of cement. Alum is NOT present in cement.
- In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?
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Ti metal is important for its strength, low density and corrosion resistance. It has bitter corrosion resistance and less reactivity than aluminium. Hence, Titanium pins remains uncorroded in the body.
Correct Option: D
Ti metal is important for its strength, low density and corrosion resistance. It has bitter corrosion resistance and less reactivity than aluminium. Hence, Titanium pins remains uncorroded in the body.
