Alkali metal ions are- 

1. Diamagnetic and colored

2. Diamagnetic and colorless

3. Paramagnetic and colored

4. Paramagnetic and colorless

Concept Questions :-

Some Important Compounds of Ca
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The compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess of CO2 is bubbled through aqueous solution of Y, Z is formed. Z on gentle heating gives back X. The compound X is-

(A) CaCO3                                           

(B) Na2CO3

(C) CaSO4.2H2O                                 

(D) K2CO3

Concept Questions :-

Some Important Compounds of Ca
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Magnesia can be prepared by-

(A) Burning Mg in air

(B) By heating hydroxide, nitrate, sulphate or carbonate of magnesium

(C) By heating Mg in steam

(D) All of these

Concept Questions :-

Some Important Compounds of Ca
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Insoluble compound in acetic acid is-

(A) Calcium oxide                             

(B) Calcium carbonate

(C) Calcium oxalate                           

(D) Calcium hydroxide

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Assertion :  LiF is almost insoluble in water

Reason :  LiCl is soluble not only in water but also in acetone.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Physical Properties & Characteristics
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Assertion : s-block elements do not occur free in nature

Reason :  s-block elements are highly electropositive in nature.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Physical Properties & Characteristics
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Assertion : Potassium and caesium are useful as electrodes in photoelectric cells.

Reason :  Potassium and caesium, when irradiated with light, the light energy absorbed is sufficient to eject out the electron from an atom.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Physical Properties & Characteristics
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Assertion :  The alkaline earth metals have much higher melting and boiling points than those of the alkali metals.

Reason : The melting and boiling points of alkaline earth metal do not vary in a regular fashion.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Physical Properties & Characteristics
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Assertion : The ionisation enthalpies of alkaline earth metals are fairly low.

Reason : In general, the low ionisation enthalpies of alkaline earth metals are due to large size of their atoms.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Physical Properties & Characteristics
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Assertion :  The magnitude of the hydration enthalpies of alkaline earth metal ions (M2+) are much larger than those for the alkali metal ions. 

Reason : The magnitude of hydration enthalpy depends upon the square of the charge on the ion.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Physical Properties & Characteristics
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Difficulty Level: