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S-Block Element...

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  • Question 1
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    Sodium and potassium belong to the category of

  • Question 2
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    What is the oxidation state of K in KO2?

  • Question 3
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    Potassium ions are the most abundant cations. They:

  • Question 4
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    Metal carbonates decompose on heating to give metal oxide and carbondioxide. Which of the metal carbonates is most stable thermally?

  • Question 5
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    Dehydration of hydrates of halides of calcium, barium and strontium i.e.,   can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?

  • Question 6
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    One of the following is highly radioactive

  • Question 7
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    2M +2H2O → 2M+ + 2OH- + H2   

    What is M ?

  • Question 8
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    To acquire noble gas configuration, alkaline earth metals lose

  • Question 9
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    The diagonal relationship exists between

  • Question 10
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    Choose the correct statements from the following.

  • Question 11
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    Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? 

  • Question 12
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    Lithium has most negative E0 value,its reaction with water is less vigorous than that of sodium which has the least negative E0 value among the alkali metals. The reason is

  • Question 13
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    Alkaline earth metals show large size of the atoms. Therefore, they have

  • Question 14
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    Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?

  • Question 15
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    Several sodium compounds find use in industries. Which of the following ompounds are used for textile industry?

  • Question 16
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    Monovalent sodium and potassium ions found in large proportions in biological fluids. They help in

  • Question 17
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    When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to

  • Question 18
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    Choose the correct order of increase in electropositivity of alkali earth metals in the options given below

  • Question 19
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    Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is

  • Question 20
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    Which of the following compounds are readily soluble in water?

  • Question 21
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    Divalent magnesium and calcium ions are found in large proportions in biological fluids.

  • Question 22
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    The alkali metals dissolve in liquid ammonia giving deep blue solutions. When they become diamagnetic, the solution turns into

  • Question 23
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    Radium salts are used in

  • Question 24
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    The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,the lowest solubility of LiF in water is due to

  • Question 25
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    Which of the following are the correct reasons for anomalous behaviour of lithium?

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