Which of the following statement about t...

Which of the following statement about the sum of the two vectors `vecA " and " vecB`, is/are correct ?

`|vecA+vecB|leA+B`

`|vecA+vecB|ge A+B`

`|vecA+vecB|ge|vecA-vecB|`

`|vecA+vecB|ge|A-B|`

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The correct Answer is:

A, D

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Which of the following statements about hydrogen are correct ?

Hydrogen has three isotopes of which protium is the most common.

Hydrogen never acts as cation in ionic salts

Hydrogen ion, `H^+`, exists freely in solution.

Dihydrogen does not act as a reducing agent

It is a strong tribasic acid.

It is prepared by acidifying an aqueous solution of borax.

It has a layer structure in which planar `BO_3` units are joined by hydrogen bonds.

It does not act as proton donor but acts as a Lewis acid by accepting a lone pair of electrons.

It has 18 horizontal rows known as periods.

It has 8 vertical columns known as periods.

It has 18 vertical columns known as groups.

It has 7 horizontal rows known as groups.