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Chemistry

Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

2
4
1
3

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Chemistry
Synthetic detergents are made from

Sodium palmitate
Sodium salt of benzene sulphonic acid
Sodium salt of benzene carboxylic acid
Sodium stearate

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

Zero
4
8
–4

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Chemistry
The substance most commonly used as a food preservative is

Sodium salt of benzoic acid
Acetic acid
Sodium carbonate
Tartaric acid

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Chemistry
The nuclear particles which are assumed to hold the nucleons together are

electrons
mesons
positrons
neutrons

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Chemistry
Of the following compounds of calcium, the one having highest covalent character is

CaF2
Cacl2
Cal2
CaBr2

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