NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI10:THE S-BLOCK ELEMENTS
315871
A substance \({\rm{X}}\) is a compound of an element of group IA, the substance \(\mathrm{X}\) gives a violet colour in flame test, \(\mathrm{X}\) is
1 \(\mathrm{LiCl}\)
2 \(\mathrm{NaCl}\)
3 \(\mathrm{KCl}\)
4 None
Explanation:
On heating an alkali metal or its salt especially chloride (due to its more volatile nature in flame), the electrons are excited easily to higher energy levels by absorbing energy. When these excited electrons return to ground state, they emit extra energy in form of radiations which fall in visible region, thus imparting colour to the flame.
CHXI10:THE S-BLOCK ELEMENTS
315872
Sodium chloride imparts golden yellow colour to the bunsen flame. This can be interpreted due to
1 Low ionisation potential of sodium
2 Photosensitivity of sodium
3 Sublimation of metallic sodium to give yellow vapour
4 Emission of excess of energy absorbed as a radiation in the visible region
Explanation:
The electrons are excited to higher energy level and on return to original state they give out visible complex formation.
CHXI10:THE S-BLOCK ELEMENTS
315873
On flame test potassium \(\left( {\rm{K}} \right)\) give ___ colour
1 Golden yellow
2 Crimson red
3 Violet
4 Apple green
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315874
\(\mathrm{Cs}^{+}\)ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have
1 high energy
2 low energy
3 longer wavelength
4 constant energy
Explanation:
\(\mathrm{Cs}^{+}\)emits light of very high frequency or energy which corresponds to violet colour.
315871
A substance \({\rm{X}}\) is a compound of an element of group IA, the substance \(\mathrm{X}\) gives a violet colour in flame test, \(\mathrm{X}\) is
1 \(\mathrm{LiCl}\)
2 \(\mathrm{NaCl}\)
3 \(\mathrm{KCl}\)
4 None
Explanation:
On heating an alkali metal or its salt especially chloride (due to its more volatile nature in flame), the electrons are excited easily to higher energy levels by absorbing energy. When these excited electrons return to ground state, they emit extra energy in form of radiations which fall in visible region, thus imparting colour to the flame.
CHXI10:THE S-BLOCK ELEMENTS
315872
Sodium chloride imparts golden yellow colour to the bunsen flame. This can be interpreted due to
1 Low ionisation potential of sodium
2 Photosensitivity of sodium
3 Sublimation of metallic sodium to give yellow vapour
4 Emission of excess of energy absorbed as a radiation in the visible region
Explanation:
The electrons are excited to higher energy level and on return to original state they give out visible complex formation.
CHXI10:THE S-BLOCK ELEMENTS
315873
On flame test potassium \(\left( {\rm{K}} \right)\) give ___ colour
1 Golden yellow
2 Crimson red
3 Violet
4 Apple green
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315874
\(\mathrm{Cs}^{+}\)ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have
1 high energy
2 low energy
3 longer wavelength
4 constant energy
Explanation:
\(\mathrm{Cs}^{+}\)emits light of very high frequency or energy which corresponds to violet colour.
315871
A substance \({\rm{X}}\) is a compound of an element of group IA, the substance \(\mathrm{X}\) gives a violet colour in flame test, \(\mathrm{X}\) is
1 \(\mathrm{LiCl}\)
2 \(\mathrm{NaCl}\)
3 \(\mathrm{KCl}\)
4 None
Explanation:
On heating an alkali metal or its salt especially chloride (due to its more volatile nature in flame), the electrons are excited easily to higher energy levels by absorbing energy. When these excited electrons return to ground state, they emit extra energy in form of radiations which fall in visible region, thus imparting colour to the flame.
CHXI10:THE S-BLOCK ELEMENTS
315872
Sodium chloride imparts golden yellow colour to the bunsen flame. This can be interpreted due to
1 Low ionisation potential of sodium
2 Photosensitivity of sodium
3 Sublimation of metallic sodium to give yellow vapour
4 Emission of excess of energy absorbed as a radiation in the visible region
Explanation:
The electrons are excited to higher energy level and on return to original state they give out visible complex formation.
CHXI10:THE S-BLOCK ELEMENTS
315873
On flame test potassium \(\left( {\rm{K}} \right)\) give ___ colour
1 Golden yellow
2 Crimson red
3 Violet
4 Apple green
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315874
\(\mathrm{Cs}^{+}\)ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have
1 high energy
2 low energy
3 longer wavelength
4 constant energy
Explanation:
\(\mathrm{Cs}^{+}\)emits light of very high frequency or energy which corresponds to violet colour.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
CHXI10:THE S-BLOCK ELEMENTS
315871
A substance \({\rm{X}}\) is a compound of an element of group IA, the substance \(\mathrm{X}\) gives a violet colour in flame test, \(\mathrm{X}\) is
1 \(\mathrm{LiCl}\)
2 \(\mathrm{NaCl}\)
3 \(\mathrm{KCl}\)
4 None
Explanation:
On heating an alkali metal or its salt especially chloride (due to its more volatile nature in flame), the electrons are excited easily to higher energy levels by absorbing energy. When these excited electrons return to ground state, they emit extra energy in form of radiations which fall in visible region, thus imparting colour to the flame.
CHXI10:THE S-BLOCK ELEMENTS
315872
Sodium chloride imparts golden yellow colour to the bunsen flame. This can be interpreted due to
1 Low ionisation potential of sodium
2 Photosensitivity of sodium
3 Sublimation of metallic sodium to give yellow vapour
4 Emission of excess of energy absorbed as a radiation in the visible region
Explanation:
The electrons are excited to higher energy level and on return to original state they give out visible complex formation.
CHXI10:THE S-BLOCK ELEMENTS
315873
On flame test potassium \(\left( {\rm{K}} \right)\) give ___ colour
1 Golden yellow
2 Crimson red
3 Violet
4 Apple green
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315874
\(\mathrm{Cs}^{+}\)ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have
1 high energy
2 low energy
3 longer wavelength
4 constant energy
Explanation:
\(\mathrm{Cs}^{+}\)emits light of very high frequency or energy which corresponds to violet colour.
