Which of the following staments are inco...

Which of the following staments are incorrect in context of borax?

It is made up of two triangular `BO_(3)` units and two tetrahederal `BO_(4)` units

One mole of bora can be used as a buffer

It is a useful primary standerd for titrating against acids

Aqueous solution of borax can be used as a buffer

Text Solution

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(b) Borax is `Na_(2)B_(4)O_(7)cdot10H_(2)O` in which 2 molecules of water among 10 molecules form a part of structure and exists as `Na_(2)[B_(4)O_(5)(OH)_(4)]cdot8H_(2)O`.
Methyl orange with pH value of 3.7 is used to detect end point. Aqueous solution of borax acts as buffer because borax is salt of strong base (NaOH) and weak acid `(H_(3)BO_(3))`

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Which of the following statements are incorrect in context of borax?

It is made up to two triangular `BO _(3)` units and two tetrahedral `BO _(4)` units

One mole of borax can be used as buffer

It is a useful primary standard for titrating against acids

Aqueous solution of borax can be used as buffer

Which of the following staments is incorrect?

Disinfectants are chemical substance which helps to kill the micro-organisms.

Antiseptic are the chemical substance which increase the growth of micro-organisms.

The substances which neutralise the excess acid and raise the pH to an appropriate level in stomach are called antacids.

Chemical substance which are used to bring down the body temperature during high fever are called antipyretics.

which of the following stament is not correct?

Pure para hydrogen can be obtained by cooling ordinaiy hydrogen to about 20 K.

The ratio of ortho and para hydrogen at 300 K and above is 3 : 1.

The ratio of ortho to para hydrogen varies with temperature.

Pure ortho hydrogen can be obtained by heating ordinary hydrogen above 300 K.