Top 500+ 9th Class Chemistry Subject Mcqs Pdf Download Chapter 07

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Encircle the most appropriate answer among the following options

1          Symbol of hydronium ion is:

(a) H+

(b) OH

(c) H30+

(d) none of these

2.         An example of non electrolyte is:

(a) Glucose

(b) aq NaCl

(c) HCI

(d) H2SO4

3.         An example of weak electrolyte is :

(a) HNO3

(b) HCI

(c) H2SO4

(d) H2CO3

4          During electrolysis takes place at anode.

(a) Catenation

(b) oxidation

(c) reduction

(d) addition

5          Which is not the characteristic of electrolyte?

(a) Cheap

(b) conductor

(c) easily oxidized

(d) soluble in water

6          In dry cell_ acts as cathode:

(a) Zn cup

(b) graphite rod

(c) paste

(d) steel rod

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

(a) ZnSO4

(b) Zn(NO3)2

(c) CuSO4

(d) both a & b

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

(a) Cathode

(b) anode

(c) electrode

(d) all of above

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

(a) Oxidized

(b) reduced

(c) redoxed

(d) decomposed

10        Anions are ions.

(a) Positive

(b) neutral

(c) negative

(d) amphoteric

11        Cations are ions.

(a) Negative

(b) positive

(c) neutral

(d) none of these

12        Electrolysis of NaCl is done in the cell:

(a) Electrolytic

(b) voltaic

(c) down’s

(d) faradays

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

(a) Na+

(b) OH

(c) H2O

(d) Cl

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

15        Which one is weak electrolyte?

(a) Citric acid

(b) carbonic acid

(c) tartaric acid

(d) all of these

16        Metallic, ammonium and hydrogen ions carry_ _charges.

(a) Negative

(b) neutral

(c) positive

(d) partial positive

17        Electrode through which electrons enter the external circuit:

(a) Anode

(b) Cathode

(c) electrode

(d) none of these

18        Electrode through which electrons leave the external circuit:

(a) Anode

(b) Cathode

(c) graphite

(d) electrolyte

19        Which one is conductor?

(a) Naphthalene

(b) paraffin wax

(c) plastic

(d) HCI

20        Which solution is not a conductor:

(a) NaCl

(b) K1

(c) CO (NH2)2

(d) CuCl2

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

(a) Protons

(b) electrons

(c) electrodes

(d) all of these

22        Spontaneous redox reaction produce current in:

(a) Voltaic cell

(b) electrolytic cell

(c) galvanic cell

(d) Both a & b

23        In an oxidation reaction electrons are:

(a) Absorbed

(b) lost

(c) moved

(d) increased

24        In reduction reaction electrons are:

(a) Lost

(b) absorbed

(c) kept constant

(d) all of these

25        Which of the following is a good electrolyte?

(a) NaCl

(b) H2SO4

(c) NaOH

(d) All of these

26        Which ionizes in small extent in water

(a) Ca(OH)2

(b) NaCl

(c) NaOH

(d) H2SO4

27        Oxidation always takes place at

(a) Anode

(b) Cathode

(c) Both of them

(d) Nome of them

28        Who invented first electrolytic cell?

(a) Berzelius

(b) Volta

(c) J. Dalton

(d) Newton

29        In galvanic cell, cathode carries.

(a) Positive charge

(b) Negative charge

(c) No charge

(d) Neutral charge

30        Cl2 gas is formed, when CI ions are

(a) Reduced

(b) Oxidized

(c) Removed

(d) Reacted with metals

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

(a) H+

(b) H2

(c) Cl2

(d) NaOH

32        Which medium accelerates the process of rusting?

(a) Acidic

(b) Basic

(c) Buffer

(d) Neutral

33        Stainless steel contains

(a) Nickel

(b) Iron

(c) Chromium

(d) All of these

34        Which of the followings is a corrosion resistant metal?

(a) Fe

(b) Zn

(c) Sn

(d) Sr

35        The electrolytic cell is made up of

(a) Cement

(b) Glass

(c) Wood

(d) All of these

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

(a) Wares

(b) Cutlery

(c) Jewellery

(d) All of these

37        Which metal has a great tendency to corrosion?

(a) Silver

(b) Copper

(c) Aluminum

(d) All of these

38        Chemical formula of sodium thio-sulphate is

(a) Na2SO4

(b) Na2SO3

(c) Na2S2O3

(d) NaSO4

39        Sterling silver is an alloy of silver and

(a) Iron

(b) Copper

(c) Chromium

(d) Aluminium

40        In HCl, oxidation number of H is

(a) -1

(b) +1

(c) +2

(d) -2

41        The oxidation number of all elements in free state is

(a) One

(b) Two

(c) Three

(d) zero

42        The oxidation number of Group-I elements is

(a) +1

(b) +2

(c) +3

(d) +4

43        The oxidation no of hydrogen in metal hydrides is

(a) +1

(b) -1

(c) +2

(d) -2

44        The oxidation number of oxygen is +2 in

(a) H2O

(b) OF2

(c) Na2O

(d) HNO3

45        The oxidation number of sulphur in H2SO4 is

(a) +1

(b) +4

(c) +6 

(d) +8