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Chemistry

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

2
4
3
1

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Chemistry
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume

Conc. HCl and conc. HNO3
Dil. HCl and dil. HNO3
Conc. HNO3 and conc. HCl
Conc. HNO3 and conc. H2SO4

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Chemistry
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

2
5
zero
4

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Chemistry
The charcoal used to decolourise brown sugar solution is

Coconut charcoal
Wood charcoal
Sugar charcoal
Animal charcoal

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Chemistry
Suspension particles have the size between

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

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Chemistry
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :

Uninterrupted power supply (UPS)
Power transmittor
Generator
Battery

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