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When α -particles are sent through a thin metal foil, most of them go straight through the foil because (one or more are correct):
(1) Alpha particles are much heavier than electrons
(2) Alpha particles are positively charged
(3) Most part of the atom is empty space
(4)Alpha particles move with high velocity
Ans: Most part of the atom is empty space
When a molecule is shown by two or more nearly equal structures, which vary in the arrangement of electrons, then the molecule is said to exhibit resonance.
The configuration 1s 2 2s 2 2p 5 3s 1 shows: (1) Excited state of O 2 - (2) Excited state of neon (3) Excited state of fluorine (4) Ground state of fluorine ato
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order
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Carboxylic Acids Carboxylic acids are the elements comprising the carboxyl functional group The carboxyl set is made up of carbonyl (>C=O) and hydroxyl (-OH) group.
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Distinguish between dry corrosion and wet corrosion. Write brief notes on dissimilar types of liquid crystals.
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Calculate the activity of nuclides: Problem: 100 mg piece of a gold ornament containing 10% copper as impurity was irradiated with thermal neutrons at 2.1×10 11 n/cm 2
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