Periodic Properties And Variation Of Properties Physical And Chemical — Chemistry STD 10 — Question

The electronegativities of atoms giving covalent molecules are generally __________.

Fill in the blanks:
During the concentration of bauxite ore, aluminium goes in ………. (soluble/insoluble) part because of its …………(acidic/basic/amphoteric) nature.

Vital force theory was discarded by the synthesis of__________ in laboratory.

when ammonium chloride is heated, it undergoes ________ . (thermal decomposition, dissociation)

When sulphur trioxide gas is passed through conc. sulphuric acid the product formed is ________ . [H₂S₂O₇/H₂S₂O₅]

Moving across a __________ of the periodic table, the elements show increasing __________ character.

The colour of conc. nitric acid prepared in the laboratory is generally ________ [pale yellow/yellowish brown] in colour. It is because a part of nitric acid decomposes to form ________ [NO/NO₂/N₂O] gas which redissolves in the nitric acid.

The gas given off at cathode during the electrolysis of acidulated water is _______ .

Fill in the blanks with suitable words : An acid is a compound which when dissolved in water forms hydronium ions as the only …………… ions.
A base is a compound which is soluble in water and contains …………….. ions.
A base reacts with an acid to form a …………….. and water only. This type of reaction is known as …………….