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01	9th Class Chemistry Mcqs Chapter 01	02	9th Class Chemistry Mcqs Chapter 02
03	9th Class Chemistry Mcqs Chapter 03	04	9th Class Chemistry Mcqs Chapter 04
05	9th Class Chemistry Mcqs Chapter 05	06	9th Class Chemistry Mcqs Chapter 06
07	9th Class Chemistry Mcqs Chapter 07	08	9th Class Chemistry Mcqs Chapter 08
09	9th Class Chemistry Mcqs Chapter 09	10	9th Class Chemistry Mcqs Chapter 10
11	9th Class Chemistry Mcqs Chapter 11	12	9th Class Chemistry Mcqs Chapter 12

CHAPTER NO 7

Electrochemistry

Encircle the most appropriate answer among the following options

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1          Symbol of hydronium ion is:

(a) H⁺

(b) OH^–

(c) H₃0⁺

(d) none of these

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2.         An example of non electrolyte is:

(a) Glucose

(b) aq NaCl

(c) HCI

(d) H2SO4

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3.         An example of weak electrolyte is :

(a) HNO₃

(b) HCI

(c) H2SO₄

(d) H2CO₃

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4          During electrolysis takes place at anode.

(a) Catenation

(b) oxidation

(c) reduction

(d) addition

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5          Which is not the characteristic of electrolyte?

(a) Cheap

(b) conductor

(c) easily oxidized

(d) soluble in water

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6          In dry cell_ acts as cathode:

(a) Zn cup

(b) graphite rod

(c) paste

(d) steel rod

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7          In Zn-Cu galvanic cell, Zn is dipped in:

(a) ZnSO₄

(b) Zn(NO3)₂

(c) CuSO₄

(d) both a & b

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In Zn-Cu galvanic cell, Zn is used as:

(a) Cathode

(b) anode

(c) electrode

(d) all of above

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9          In Zn + Cu⁺² → Zn⁺² + Cu, Zn is:

(a) Oxidized

(b) reduced

(c) redoxed

(d) decomposed

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10        Anions are ions.

(a) Positive

(b) neutral

(c) negative

(d) amphoteric

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11        Cations are ions.

(a) Negative

(b) positive

(c) neutral

(d) none of these

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12        Electrolysis of NaCl is done in the cell:

(a) Electrolytic

(b) voltaic

(c) down’s

(d) faradays

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13        Which one is not produced during electrolysis of aqueous NaCl?

(a) Na⁺

(b) OH^–

(c) H₂O

(d) Cl^–

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14        In pure water, out of only one molecule ionizes.

(a) 6 x 10⁶

(b) 6 x 10⁸

(c) 6 10¹⁶

(d) 6 x 10¹²

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15        Which one is weak electrolyte?

(a) Citric acid

(b) carbonic acid

(c) tartaric acid

(d) all of these

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16        Metallic, ammonium and hydrogen ions carry_ _charges.

(a) Negative

(b) neutral

(c) positive

(d) partial positive

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17        Electrode through which electrons enter the external circuit:

(a) Anode

(b) Cathode

(c) electrode

(d) none of these

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18        Electrode through which electrons leave the external circuit:

(a) Anode

(b) Cathode

(c) graphite

(d) electrolyte

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19        Which one is conductor?

(a) Naphthalene

(b) paraffin wax

(c) plastic

(d) HCI

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20        Which solution is not a conductor:

(a) NaCl

(b) K₁

(c) CO (NH₂)₂

(d) CuCl₂

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 21       Rods through which electric current enters or leaves the cell:

(a) Protons

(b) electrons

(c) electrodes

(d) all of these

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22        Spontaneous redox reaction produce current in:

(a) Voltaic cell

(b) electrolytic cell

(c) galvanic cell

(d) Both a & b

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23        In an oxidation reaction electrons are:

(a) Absorbed

(b) lost

(c) moved

(d) increased

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24        In reduction reaction electrons are:

(a) Lost

(b) absorbed

(c) kept constant

(d) all of these

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25        Which of the following is a good electrolyte?

(a) NaCl

(b) H₂SO₄

(c) NaOH

(d) All of these

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26        Which ionizes in small extent in water

(a) Ca(OH)₂

(b) NaCl

(c) NaOH

(d) H₂SO₄

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27        Oxidation always takes place at

(a) Anode

(b) Cathode

(c) Both of them

(d) Nome of them

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28        Who invented first electrolytic cell?

(a) Berzelius

(b) Volta

(c) J. Dalton

(d) Newton

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29        In galvanic cell, cathode carries.

(a) Positive charge

(b) Negative charge

(c) No charge

(d) Neutral charge

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30        Cl₂ gas is formed, when CI ions are

(a) Reduced

(b) Oxidized

(c) Removed

(d) Reacted with metals

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31        Which ion is not formed during is of aqueous sodium chloride?

(a) H⁺

(b) H2

(c) Cl₂

(d) NaOH

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32        Which medium accelerates the process of rusting?

(a) Acidic

(b) Basic

(c) Buffer

(d) Neutral

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33        Stainless steel contains

(a) Nickel

(b) Iron

(c) Chromium

(d) All of these

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34        Which of the followings is a corrosion resistant metal?

(a) Fe

(b) Zn

(c) Sn

(d) Sr

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35        The electrolytic cell is made up of

(a) Cement

(b) Glass

(c) Wood

(d) All of these

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36        Which of the following is a common example of silver plating?

(a) Wares

(b) Cutlery

(c) Jewellery

(d) All of these

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37        Which metal has a great tendency to corrosion?

(a) Silver

(b) Copper

(c) Aluminum

(d) All of these

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38        Chemical formula of sodium thio-sulphate is

(a) Na₂SO₄

(b) Na₂SO₃

(c) Na₂S₂O₃

(d) NaSO₄

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39        Sterling silver is an alloy of silver and

(a) Iron

(b) Copper

(c) Chromium

(d) Aluminium

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40        In HCl, oxidation number of H is

(a) -1

(b) +1

(c) +2

(d) -2

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41        The oxidation number of all elements in free state is

(a) One

(b) Two

(c) Three

(d) zero

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42        The oxidation number of Group-I elements is

(a) +1

(b) +2

(c) +3

(d) +4

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43        The oxidation no of hydrogen in metal hydrides is

(a) +1

(b) -1

(c) +2

(d) -2

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44        The oxidation number of oxygen is +2 in

(a) H₂O

(b) OF₂

(c) Na₂O

(d) HNO₃

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45        The oxidation number of sulphur in H₂SO₄ is

(a) +1

(b) +4

(c) +6 

(d) +8

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