Question

Choose the correct option given in brackets to complete the sentence.
(i) For an element, symbol represents ________atom [one/two]
(ii) In ________ reaction, two compounds exchange their positive & negative radicals mutually to form two new compounds. [Direct combination/double decomposition]
(iii) ________solutions turns blue Litmus paper red [Basic/Acidic]
(iv) For an atom to be chemically reactive its octet should be ________[complete/incomplete]
(v) The three isotopes of hydrogen are ________, deuterium & tritium. [Proton/Protium]

Answer 1

Sentences with correct options are written below-

(i) For an element, symbol represents (one) atom.

(ii) In (double decomposition) reaction, two compounds exchange their positive & negative radicals mutually to form two new compounds.

(iii) (Acidic) solutions turns blue Litmus paper red .

(iv) For an atom to be chemically reactive its octet should be (incomplete).

(v) The three isotopes of hydrogen are (Protium). deuterium & tritium.