Which of the following statements is not true about the dilute solutions of alkali metals in liquid ammonia?

1. They are deep blue coloured solutions.

2. They are highly conducting in nature.

3. They are diamagnetic in nature.

4. Ammoniated cations and ammoniated anions are formed in a solution.

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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Which is not correctly matched?

(1) Basic strength of oxides                                 Cs2O<Rb2O<K2O<Na2O<LiO2

(2) Stability of peroxides                                      Na2O <K2O2<Rb2O2<Cs2O2

(3) Stability of bicarbonate                                   LiHCO3<NaHCO3<KHCO3<RbHCO3<Cs HCO3

(4) Melting Point                                                  NaF<NaCl<NaBr<Nal

 

(A) 1 and 4                                           

(B) 1 and 3

(C) 1 and 2                                           

(D) 2 and 3

Subtopic:  Chemical Properties |
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In manufacture of sodium carbonate from Solvay (or ammonia-soda) process the raw material used is :

(1) NaOH                                             

(2) Na2SO4

(3) NaCl                                               

(4) NaHCO3

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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Which of the following reactions of potassium superoxide supply oxygen gas in the breathing equipments used in space and submarines?

(1) Reaction of superoxide with nitrogen in the exhaled air.

(2) Reaction of superoxide with moisture in the exhaled air.

(3) Reaction of superoxide with carbon dioxide in the exhaled air

 

(1) (1), (2) and (3)                                       

(2) (2) and (3) only

(3) (2) only                                                 

(4) (1) and (2) only

Subtopic:  Chemical Properties |
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Which of the following acts as an oxidizing as well as a reducing agent?

(1) Na2O                                     

(2) NaO3

(3) NaNO                                     

(4) NaNO2

Subtopic:  Chemical Properties |
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Alkaline earth metal nitrates on heating decompose to give:

(1) MNO22 and O2 only                                   

(2) MO, N2 and O2

(3) MO, NO2 and O2                                         

(4) MO and NO2 only

Subtopic:  Chemical Properties |
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Consider the following statements and pick out the correct one.

(1) The solubility, thermal stability, and the basic character of the hydroxides of alkaline earth

      metals increases from MgOH2 to BaOH2.

(2) The dehydration of hydrated chlorides, bromides, bromides and iodides of Ca, Sr and Ba can be

      achieved on heating.

(3) The chlorides of both beryllium and aluminium are soluble in organic solvents and are strong

      Lewis acids.

 

(1) (1) and (2) only                                     

(2) (1) and (3) only

(3) (1), (2) and (3)                                     

(4) none

Subtopic:  Chemical Properties |
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A metal [X] heating on nitrogen gas gives [Y]. [Y] on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. [Y] is-

1. MgNO32                                     

2. Mg3N2

3. NaN3                                             

4. MgO

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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Assertion : Beryllium resembles aluminium.

Reason : : Charge / radius of Be2+ ion is nearly the same as that of the Al3+ 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
Subtopic:  Physical Properties |
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Assertion : As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases.

Reason : Lithium carbonates is not so stable to heat ; lithium being very small in size polarizes a large CO32-ion leading to the formation of more stable Li2O and CO2.

  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
Subtopic:  Physical Properties |
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