NO2 is obtained by heating:

(1) CsNO3

(2) KNO3

(3) LiNO3

(4) NaNO3

Subtopic:  Chemical Properties |
 71%
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Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

(a) A light blue precipitate is first formed which finally dissolves to give a deep blue solution

(b) A white precipitate appears which dissolves to give a colourless solution.

(c) A white precipitation is formed which does not dissolve 

(d) No change takes place and the solution remains clear

Subtopic:  Chemical Properties |
 56%
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The products of the electrolysis of concentrated aqueous solution of common salt are:

(1) Na + Cl2

(2) H2 + O2

(3) NaOH + H2 + Cl2

(4) NaOH + Cl2 + O2

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
 71%
From NCERT
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KO2 is used in oxygen cylinder in space air craft and submarines because it:

(a) absorbs CO2 and increase O2 content

(b) eliminate moisture

(c) absorbs CO2

(d) produces O2

Subtopic:  Physical Properties | Chemical Properties |
 68%
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Manufacture of NaOH is done by:

(1) Castner - Kellner process

(2) Solvay process

(3) Brine process

(4) Mond's process

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 72%
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Lithium is the only alkali metal which is not placed in kerosene but is wrapped in paraffin wax, because:

(1) it reacts with kerosene

(2) it floats to the surface of kerosene because of low density

(3) it does not react with air and H2O

(4) none of the above

Subtopic:  Physical Properties |
 70%
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When CO2 is bubbled into an aqueous solution of Na2CO3, the following is formed:

(1) H2O

(2) OH-

(3) NaHCO3

(4) NaOH

Subtopic:  Chemical Properties |
 89%
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Which of the following acts as reducing agent as well as oxidising agent?

(1) Na2O

(2) Na2O2

(3) NaNO3

(4) KNO3

Subtopic:  Chemical Properties |
 75%
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Which of the following alkali metal ion in aqueous solution is the best conductor of electricity?

(1) Li+

(2) Na+

(3) Cs+

(4) K+

Subtopic:  Chemical Properties |
 72%
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Which of the following is soluble in pyridine:-

(1) LiCl

(2) CsCl

(3) NaCl

(4) KCl

Subtopic:  Physical Properties |
 77%
From NCERT
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