Chemistry - Questions and Answers, General Study (GK)

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541.

Consider the following statements regarding electrochemical series helps
1. In extraction of metals
2. In protecting the metal from corrosion
3. In comparing the reactivity of metals
Which of the above is/are true.

(a)Only 1

(b)Only 2

(d)1, 2 and 3

Comment

Answer is: D

542.

In an electrochemical cell that functions as a voltaic cell

(a)Electrons move from the cathode to the anode

(b)Electrons move through the salt bridge

(c)Electrons can move either from cathode to anode or from anode to cathode

(d)Reduction occurs at the cathode

Comment

Answer is: D

543.

On the basis of position in the electrochemical series, the metal which does not displace hydrogen from water and acid is

(a)Al

(b)Pb

(c)Ba

(d)Hg

Comment

Answer is: D

544.

Which one of the following pairs materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers etc?

(a)Nickel and Cadmium

(b)Zinc and carbon

(c)Lead peroxide and lead

(d)Iron and Cadmium

Comment

Answer is: A

545.

Aluminum surfaces are of ten 'anodized'. This means the deposition of a layer of

(a)Chromium oxide

(b)Aluminum oxide

(c)Nickel oxide

(d)Zinc oxide

Comment

Answer is: B

546.

Consider the following statements
1. In Modern Periodic Table, the number of periods is 7.
2. In Modern Periodic Table, the number of groups is 18.
3. The long form of Periodic Table was developed by Range and Werner.
Which of the Correct?

(a)Only 1

(b)1 and 2

(d)1, 2 and 3

Comment

Answer is: D

547.

What is the correct increasing order of electronegativity for the most common oxidation States among the following elements?

(a)F < O < N < C

(b)O < N < C < F

(c)C < N < F < O

(d)C < N < O < F

Comment

Answer is: D

548.

Two new elements (discovered in August, 2003) with atomic number 113 and 115 are to be placed in

(a)S - block

(b)P - block

(c)D - block

(d)F - block

Comment

Answer is: B

549.

Consider the following statements about d - block elements
1. They are all metals.
2. All of them are not coloured.
3. They show variable valency.
4. Most of them form simple salts.
Which of the statements given above are correct?

(a)1 and 2

(b)1, 2, and 3

(d)3 and 4

Comment

Answer is: B

550.

Which one of the following consists only the ores of magnesium?

(a)Magnesite, carnallite, cassiterite, dolomite, epsom salt

(b)Magnesite, carnallite, dolomite, kieserite, epsom salt

(c)Magnesite, carnallite, dolomite, Galena, malachite

(d)Magnesite, cassiterite, kieserite, Galena, malachite

Comment

Answer is: B

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Chemistry - Questions and AnswersPage 55

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