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Chemistry

Chemistry
The oxidation number of nickel in K4[Ni(CN)4] is

–4
8
4
Zero

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Chemistry
The heat value of combustion of Gasoline is

14600 kJ/kg
12600 kJ/kg
47000 kJ/kg
39400 kJ/kg

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Chemistry
Normal rainwater is slightly acidic due to the presence of

Sulphur dioxide
None of these
Methane
Carbon dioxide

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Chemistry
German silver, an alloy, does not contain the metal

Copper
Zinc
Nickel
Silver

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Chemistry
The items amenable to detection by soft x-rays are

narcotics
lead in bullets
genuine coins from counterfeit coins
contrabands

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Chemistry
Suspension particles have the size between

10–8 – 10–10cm
10–5 – 10–7cm
10–2 – 10–4 cm
10–1 – 10–2 cm

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