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CHEMISTRY

Chemistry
The mineral containing both magnesium and calcium is

calcite
magnesite
carnallite
dolomite

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Chemistry
The metal does not give H2 on treatment with dilute HCL is

Fe
Ca
Ag
Zn

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Chemistry
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

10 gram of molecule
0.5 gram of molecule
5 gram of molecule
1 gram of molecule

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Chemistry
The most extensive, commercially useful source of thorium as monazite sand occurs in India at

West Bengal coast
Orissa coast
Gujarat coast
Travancore coast

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Chemistry
The main active constituent of tea and coffee is

aspirin
caffeine
nicotine
chlorophyll

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