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Purification of aluminium by electrolytic refining is carried out by :

Purification of alumina is essential because :

Purest form of iron is cast iron. True or False

Purest form of silica is :

Purest form of iron is called as

Write the name of purest form of iron.

Purest form of iron is

Purest form of iron is :

Pure water is kep in a vessel and it remains exposed to atmospheric CO_(2) which is absorbed, then its pH will be

Pured Cl_2 is prepared on heating

Pure water is kept in a vessel and it remains exposed to atmospheric CO_2 which is absorbed, then its pH will be…….

Pure water does notconduct electricity because it is

Pure water dissociates to a small extent as per equilibrium 2H_2O_((i)) hArr H_3O_((eq))^(+) +OH_((eq))^(-) The pH of pure water at 298 K is 7, what will be pH of pure water at 310 K?

Pure water does not conduct electricity because it

Pure water does not conduct electricity because it is :

Pure sulphur was burnt. the gaseous products are SO_(2)=60% (mol), SO_(3)=20% (mol) and O_(2)=20% (mol). If initially 50 moles of sulphur was taken then how many moles of O_(2) should be taken.

Pure solvent A has freezing point 16.5^(@)C. On dissolving 0.4 g of B in 200 g of A, the solution freezing at 16.4^(@)C and on dissolving 2.24 g of C in 100 g of A, the solution has freezing point of 16.0^(@)C. If the molar mass of Bis "74 g mol"^(-1), what is the molar mass of C?

Pure silicon is an insulator. Silicon doped with phosphorus is a semi-conductor. Silicon doped with gallium is also a serni-conductor. What is the difference between two doped silicon semi- conductors ?

Pure (R) Mandelic acid has specific rotation of 150. Ifa sample contains 60% of the R and 40% of its enantiomer, the [alpha] of his solution is.

Pure silicon is:

Pure primary amines underline("can be prepared ")by the action of ammonia on alkyl halides.

Pure ozone is ……………gas.

Pure ozone is ………………. .

Pure phosphoric acid is very viscous, because :

Pure phosphine is not combustible while impure phosphine is combustible, this combustibility is due to presence of:

Pure ozone is ……………

Pure nitric acid is colourless, on standing it becomes yellow. Justify your answer.

Pure NaCl is prepared by saturating a cold saturated solution of common salt in water with HCl gas. The principle used is

Pure O_(2) instead of air is used to oxidise the pig iron because:

Pure nitrogen gas is obtained from

Pure N_(2) gas is obtained from

Pure m-bromotoluene can be obtained by

Pure N_2 can be obtained by:.

Extra pure N_2 can be obtained by heating

Pure HF does not attack

Pure HF does not attack:

Pure HBr gas may be obtained by heating sodium bromide with syrupy phospheric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is:

Pure H_2S gas can be obtained by the action of water on :

Pure conc. HNO_(3) makes iron passive as the surface is covered with protective layer of

Pure CO can be obtained from :

Pure H_2 is obtained by the action of:

Pure Cl_(2) is prepared by

Pure chloroform may be prepared by :

pure benzene freezes at 5.3^(@)C. A solution of 0.233 g of phenyl acetic acid (C_(6)H_(5)CH_(2)COOH) freezes at 4.47^(@)C. Form this observation, one can conclude that pbenyl acetic acid