Which of the following statements are co...

Which of the following statements are correct ?

F is the most electronegative and Cs is the most electropositive available element

The electro negativity of halogens decreases from F to I

The electron affinity of Cl is higher than that of F though their electro negativity is the reverse

The electron affinity of noble gases is low.

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The correct Answer is:

A, B, C

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Which of the following statement are correct ?

Visible region of electromagnetic radiations have wavelength from 400 nm to 800 nm

The energy of photon having wavelentgth 800 nm is larger than that having 400 nm

Balmer spectral series lies in the visible portion of the electromagnetic radiation.

Lyman spectral series lies in the visible portion of the electromagnetic radiation

Boran is used cleaning metals

`Al_(2)O_(3)` is amphoteric white `B_(2)O_(3)` is acidic

Boric acid on heating with Cuo gives metaborate and boran bead test

Boran nitride is inorganic graphite

Quenched steel is mild steel

Nitriding is heating iron in atmosphere of `N_(2)`

stainless steel is produced by heating wrought iron in only moltes chromium

mild steel is obtained by annealing