Select the correct word from the list in bracket to complete each statement .
Pure conc . Nitric acid of fuming nitric acid renders the metal _______[zinc /copper/ iron] passive or inactive.

Select the correct word from the list in bracket to complete each statement . A mineral acid obtained from conc .nitric acid on reaction with a non - metal is _______ [hydorchloric acid/sulphuric acid/carbonic acid].

Select the correct word from the list in bracket to complete each statement . Aqua regia is a mixture of one part of ____ and three parts of ______ [ conc. Hydrochloric acid/ conc .nitri acid] in which nitric acid ______[reduces/ oxidises] hydrochloric acid to chlorine.

Select the correct answer from the choice in bracket to complete each sentence. Matter is added or removed during a - [chemical/physical] change

Select the correct answer from the choice in bracket to complete each sentence:- An element Z with zero valency is a — [metal/noble gas/non-metal].

Select the correct word from the list in bracket to complete each statement . The reaction of ________[calcium carbonate /calcium oxide/calcium sulphite]with dilute nitric acid is an example of a neutralization reaction.

Select the correct word from the list in bracket to complete each statement . The oxidized product obtained on reaction of H_(2)S gas with dil . HNO_(3) is ________________[Sulphur dioxide /Sulphur/sulphuric acid].

Select the correct answer from the choice in bracket to complete each sentence: An example of a monoatomic molecule is _______ [hydrogen/helium).

Select the correct answer from the choice in bracket to complete each sentence: Dust in air is an example of________ [heterogeneous/homogeneous) mixture.

Select the correct word from the words in bracket A metal which reacts with an alkali to liberate hydrogen. [iron/copper / aluminium]

Select the correct word from the words in bracket to complete the sentence : The electrode at which anions donate excess electrons and are oxidized to neutral atoms is the ________[anode/cathode]