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During a flame test why is calcium''s flame not persistent, while that of strontium is?
Ans) Because it does not have many ions as compared to the Strontium. It is the ions which produce color.
Ionic and covalent bonds are present in: (1) CCl 4 (2) CaCl 2 (3) NH 4 Cl
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Some of them show (S)-configuration at all their chiral centres. Illustrate their configurational formulae. If there is a meso-compound with this molecular formula illustrate it
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what groups comprise each block of elements in the periodic table?
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Neutrons are found in atoms of all elements except in: (1) Chlorine (2) Oxygen (3) Argon (4)Hydrogen Ans: Hydrogen
The heat of combustion for ethane, C 2 H 6 , is 52.0 kJ/g. How much heat could be released if 1 mol of ethane undergoes full combustion? Answer:
Quantum numbers of an atom can be defined on the basis of: (1) Hund's rule (2) Aufbau's principle (3) Pauli's exclusion principle (4) Heisenberg's uncertainty principl
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