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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Ionic mobility of which of the following alkali metal ions is lowest when an aqueous solution of their salts are put under an electric field?

(1) Na                       

(2) K

(3) Rb                       

(4) Li

Subtopic:  Physical Properties |
 82%
NEET - 2017
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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:

(a) Ionic nature of lithium fluoride             

(b) High lattice enthalpy

(c) High hydration enthalpy of lithium ion

(d) Low ionisation enthalpy of lithium atom

Subtopic:  Physical Properties |
 67%
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By adding gypsum to cement:

(1) Setting time of cement becomes less       

(2) Setting time of cement increases

(3) Colour of cement becomes light               

(4) Shining surface is obtained

Subtopic:  Reasoning Questions | Compounds of Ca and Na -Preparations, Properties & Uses |
 70%
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