25. Elements exposed to flame/heat as seen in fireworks displays have characteri

Question

25. Elements exposed to flame/heat as seen in fireworks displays have characteristic colors because: a) atoms of different elements have a distinctive number of neutron energy levels. atoms of different elements absorb energy causing unique electron transitions between energy levels. b) o) atoms of different elements absorb energy causing unique proton transitions between energy levels elements combine to form distinctive compounds that exhibit characteristic colors. d) 26. Which of the following elements does NOT occur as a diatomic molecule? a hydrogen b. chlorine helium d. bromine 27. When the temperature of a solution goes up, the solubility of a. solids usually goes up and gases usually goes down b. solids usually goes up and gases usually goes up c. solids usually goes down and gases usually goes up d. solids usually goes down and gases usually goes down

Explanation / Answer

25) Elements exposed to heat flow have different colours because it absorb energy from vibration motion of electron. Depending upon absorptivity color is seen .

Thus answer is B

26)Helium is a monoatomic gas while rest are diatomic molecules

27)when temperature is increase, both solid and gas goes up where solution acts like a fluidised bed both moving upwards due to heat transfer.

Thus answer is B

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