LiAlH4 is obtained by reacting an excess of ...... with an etheral solution of AlCl3.

  • LiCl

  • LiH

  • Li

  • LiOH

Manufacture of NaOH is done by:

  • Castner - Kellner process

  • Solvay process

  • Brine process

  • Mond's process

Sodium does not form Na2+ ,because:

  • Sodium contains only one electron in its outermost shell

  • First ionization potential is small and the difference in first and second ionization potential is very large.

  • Radius of Na+2 is much smaller than of Na+

  • None of the above.

Lithium is the only alkali metal which is not placed in kerosene but is wrapped in paraffin wax, because:

  • it reacts with kerosene

  • it floats to the surface of kerosene because of low density

  • it does not react with air and H2O

  • none of the above

Alkali metals are characterised by:

  • Good conductors of heat and electricity.

  • High melting points.

  • Low oxidation potentials.

  • High ionisation potentials.

Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

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

  • A white precipitate appears which dissolves to give a colourless solution.

  • A white precipitation is formed which does not dissolve 

  • No change takes place and the solution remains clear

Which has lowest thermal stability?

  • Li2CO3

  • Na2CO3

  • K2CO3

  • Rb2CO3

An alkali metal that reacts with nitrogen to form nitride is -

  • Li

  • Na

  • Cs

  • None of the above

Caustic soda is:

  • Efflorescent

  • Deliquescent

  • Hygroscopic

  • Oxidant

The most basic oxide among the following is:

  • Al2O3

  • BaO

  • As2O3

  • Na2O

Pearl ash and caustic potash are chemically:

  • K2CO3 and KOH

  • KOH and K2CO3

  • Na2CO3 and KOH

  • Na2CO3 and NaOH

The most dangerous method of precipitating hydrogen would be by the action of HCl on:

  • Zn

  • Fe

  • K

  • Al

Which is industrially prepared by the electrolysis of aqueous NaCl?

  • Na2CO3

  • NaHCO3

  • NaOH 

  • NaOCl

The products of the electrolysis of aqueous solution of common salt are:

  • Na + Cl2

  • H2 + O2

  • NaOH + H2 + Cl2

  • NaOH + Cl2 + O2

Compound having lowest melting point:

  • LiCl                               

  • CsCl

  • RbCl                               

  • KCl

Sodium cannot be extracted by the electrolysis of brine solution because:

  • sodium leberated reacts with water to produce NaOH+H2

  • sodium being more electropositive than hydrogen, H2 is liberated at cathod and not sodium

  • electrolysis cannot take place with brine solution

  • none of the above

KO2 is used in oxygen cylinder in space air craft and submarines because it:

  • absorbs CO2 and increase O2 content

  • eliminate moisture

  • absorbs CO2

  • produces O2

Tin dissolves in boiling caustic soda solution because of the formation of soluble:

  • Sn(OH)2

  • Sn(OH)4

  • Na2SnO3

  • none of these

Potash alum is used in purification of water because:

  • it kills the micro-organisms

  • it precipitates the colloidal matter

  • it removes the hardness of water

  • it catalyses the removal of impurities

The pair of compounds which cannot exist together in solution is:

  • NaHCO3 and NaOH

  • Na2CO3 and NaHCO3

  • Na2CO3 and NaOH

  • NaHCO3 and NaCl

Which one is the highest melting point halide?

  • NaCl

  • NaBr

  • NaF

  • NaI

The byproduct of the Solvay process is:

  • CO2

  • NH3

  • CaCl2

  • CaCO3

What are the by-products of the Solvay process

  • CaCl2, CO2, NH3 

  • Na2CO3, CO2

  • NH4Cl, CaO  

  • CaO, Na2CO3

Highly soluble hydroxide in water is formed by -

  • Ni2+

  • K+

  • Zn2+

  • Al3+

What would you observe if excess of dilute NaOH solution is added and shaken with an aqueous solution of aluminium chloride?

  • A permanent white precipitate is formed immediately

  • No change at first but a white precipitate is formed on standing

  • A white precipitate is formed which later dissolves

  • A green precipitate which turns red on standing in air

The strongest reducing agent among the following is:

  • K

  • Na

  • Al

  • Mg

When crystal of caustic soda is exposed to air, a liquid layer is deposited because:

  • crystal melts

  • crystal loses water

  • crystal absorbs moisture and CO2

  • crystal sublimes

Which one of the following is formed on dissolving I2 in aqueous solution of KI ?

  • KIO4

  • KIO

  • KI3

  • KIO3

The correct statement among the following regarding CsBr3 is -

  • It is a covalent compound.

  • It contains Cs2+ and Br- ions.

  • It contains Cs+, Br- and Br2 lattice molecules.

  • It contains Cs+ and Br3- ions.

Hypo is chemically:

  • Na2S2O3.2H2O

  • Na2S2O3.3H2O

  • Na2S2O3.4H2O

  • Na2S2O3.5H2O

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