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Chemistry

Chemistry
The metal ion present in Vitamin B12 is

Zinc
Cobalt
Iron
Nickel

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Chemistry
Curd is sour due to presenceof

Oxalic acid
Lactic acid
Tartaric acid
Acetic acid

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > Na+ > O2- > F-
O2- > F- > Na+ > N3-
Na+ > O2- > N3- > F-
N3- > O2- > F- > Na+

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Chemistry
One carat of diamond is equal to

100 mg
150 mg
250 mg
200 mg

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Chemistry
Black lung disease occurs in people working in

Paint manufacturing industry
Coal mines
Organic solvents industry
Electroplating industry

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Chemistry
Which of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers, etc. ?

Iron and cadmium
Lead peroxide and lead
Zinc and carbon
Nickel and cadmium

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