Distinguish Between. - Science STD 9 Questions - Vidyadip

Questions

Distinguish Between.

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3 questions · self-marked practice — reveal the answer and mark yourself.

Question 13 Marks

the Negative electrode and the positive electrode.

Answer

Negative Electrode	Positive Electrode
(i) Negatively charged electrodes are called as a cathode.	Positively charged electrodes are called as Anode.
(ii) Positively charged cations move towards the cathode or negative electrode.	Negatively charged anions move towards the anode or positive electrode.
(iii) Cathode accepts electrons from cations	Anode gives electrons to anions

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Question 23 Marks

Cation and anion

Answer

Cations	Anions
(i) Cations are ions with a net positive charge.	Anions are ions with a net negative charge.
(ii) Cations are generally formed by metals. When metals donate electrons, they have excess of protons, hence they form cations.	Anions are generally formed by non-metals. When non-metals accept electrons, they have excess of electrons, hence they form anions.
(iii) Cations are attracted towards the cathode which are negatively charged electrodes.	Anions are attracted towards the anode which are positively charged electrodes.
(iv) e.g.: Na+, Ca2+, Mg2+, K+ etc.	e.g.: $O ^2, S ^{2-}, Cl ^{-}, Br ^{-}$etc.

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Question 33 Marks

Acids and bases

Answer

Acids	Bases
(i) A substance which liberates H+ ions when dissolved in water is an acid(ii) Blue litmus turns red in an acid.(iii) The pH of an acid is less than 7.(iv) Acids are sour to taste(v) e.g. HCl, H2SO4	A substance which liberates OH– ions when dissolved in water is called a base.Red litmus turns blue in a baseThe pH of a base is greater than 7.Bases are bitter to taste,e.g. NaOH, KOH.

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