Organic Chemistry — Chemistry STD 10 — Question

The compounds of carbon and hydrogen are called _______ .

An alkaline solution which gives dense white fumes with hydrochloric acid gas is ________. [sodium hydroxide/ammonium hydroxide]

The salt prepared by the method of direct combination is __________.

The following are the typical properties of dilute acid. complete them by inserting suitable words :
Sulphide + Acid → ................ + ....................

Copper(II) oxide which is ________ [brown/black] in colour is strongly heated and then ammonia gas is passed over it for sometime. The colour of the residue is ________ [reddish/silvery]. This reaction shows ________ [reducing/oxidising] nature of ammonia.

Hydrogen gas and chlorine gas react ________ when exposed to direct sunlight. [slowly, explosively]

In a period or in a group, the larger the atomic size of an element, the __________ metallic is the element.

The elements placed in the extreme right hand side group are called________(noble gases/light gases).

Sulphuric acid used for making fertilisers is made by the _______ process.