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Chemistry

Chemistry
The oil used in the froth floatation process is

olive oil
coconut oil
kerosene oil
pine oil

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

Na2O + K2O
CaO
Al2O3
CaSO4, 2H2O

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Chemistry
Which one of the following contributes largely to the ‘green house effect’ ?

Water vapour
Carbon dioxide
Ozone
Carbon monoxide

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Chemistry
Threshold limit value of copper in the atmospheric air is

0.001 mg/m3
5.0 mg/m3
1.0 mg/m3
0.01 mg/m3

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Chemistry
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?

Titanium
Copper
Iron
Aluminium

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Chemistry
The metal used to galvanise iron to protect it from rusting is

Antimony
Chromium
Zinc
Lead

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