Considering the following observations, solution A is prepared with a ________ and solution B with a ________.
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(a) non-metal oxide; metal oxide
(b) metal oxide; non-metal oxide

Fill in the following balnks with suitable words:

(a) Metals are ........................... conductors of heat and ............................

(b) Most non-metals are ........................... conductors of heat and ...........................

(c) Phosphorous is a very ........................... non-metal.

(d) Metals react with acids to produce ........................... gas.

(e) Iron is more ........................... than copper.

(f) Metals form ........................... oxides whereas non-metals form ........................... oxides.

(g) Sulphur forms ........................... oxide whereas magnesium forms ........................... oxide.

(h) A non-metal is used to make an antiseptic solution called tincture ...........................

When a non-metal reacts with oxygen, it forms a non-metallic oxide. This non-metallic oxide when reacted with $H_{2}O$, form a substance, ‘X’ with pH value less than 7. Select the correct option regarding the substance, ‘X’.