Group-1 Elements: Alkali Metals
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CHXI10:THE S-BLOCK ELEMENTS

315867 The alkali metals are chemically similar because

1 each element has an atomicity one.
2 their outermost electrons have the same energy.
3 they have the same electronic configuration of the valence shell.
4 their outermost electrons have the same principal quantum number.
CHXI10:THE S-BLOCK ELEMENTS

315868 Assertion :
Alkali metals do not impart colour to the flame.
Reason :
Their ionization enthalpies are very high.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI10:THE S-BLOCK ELEMENTS

315869 The material used in photoelectric cells contains

1 Cs
2 Li
3 Be
4 Mg
CHXI10:THE S-BLOCK ELEMENTS

315870 Alkali metals give colour in Bunsen flame due to

1 low ionisation potential
2 low M.P.
3 softness
4 one electron in outermost orbit
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CHXI10:THE S-BLOCK ELEMENTS

315867 The alkali metals are chemically similar because

1 each element has an atomicity one.
2 their outermost electrons have the same energy.
3 they have the same electronic configuration of the valence shell.
4 their outermost electrons have the same principal quantum number.
CHXI10:THE S-BLOCK ELEMENTS

315868 Assertion :
Alkali metals do not impart colour to the flame.
Reason :
Their ionization enthalpies are very high.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI10:THE S-BLOCK ELEMENTS

315869 The material used in photoelectric cells contains

1 Cs
2 Li
3 Be
4 Mg
CHXI10:THE S-BLOCK ELEMENTS

315870 Alkali metals give colour in Bunsen flame due to

1 low ionisation potential
2 low M.P.
3 softness
4 one electron in outermost orbit
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CHXI10:THE S-BLOCK ELEMENTS

315867 The alkali metals are chemically similar because

1 each element has an atomicity one.
2 their outermost electrons have the same energy.
3 they have the same electronic configuration of the valence shell.
4 their outermost electrons have the same principal quantum number.
CHXI10:THE S-BLOCK ELEMENTS

315868 Assertion :
Alkali metals do not impart colour to the flame.
Reason :
Their ionization enthalpies are very high.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI10:THE S-BLOCK ELEMENTS

315869 The material used in photoelectric cells contains

1 Cs
2 Li
3 Be
4 Mg
CHXI10:THE S-BLOCK ELEMENTS

315870 Alkali metals give colour in Bunsen flame due to

1 low ionisation potential
2 low M.P.
3 softness
4 one electron in outermost orbit
Join With Us for More Updates
CHXI10:THE S-BLOCK ELEMENTS

315867 The alkali metals are chemically similar because

1 each element has an atomicity one.
2 their outermost electrons have the same energy.
3 they have the same electronic configuration of the valence shell.
4 their outermost electrons have the same principal quantum number.
CHXI10:THE S-BLOCK ELEMENTS

315868 Assertion :
Alkali metals do not impart colour to the flame.
Reason :
Their ionization enthalpies are very high.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI10:THE S-BLOCK ELEMENTS

315869 The material used in photoelectric cells contains

1 Cs
2 Li
3 Be
4 Mg
CHXI10:THE S-BLOCK ELEMENTS

315870 Alkali metals give colour in Bunsen flame due to

1 low ionisation potential
2 low M.P.
3 softness
4 one electron in outermost orbit
For More Updates join with Us