Chemistry - Questions and Answers, General Study (GK)

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71.

When items or jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

(a)cooling to below 0°C

(b)heating above 100°C

(c)passing an electric current

(d)just keeping it for 10 min

Comment

Answer is: CNA

72.

Which one of the following is not a periodic property i.e. does not show any trend on moving from one side to the other in the periodic table?

(a)atomic size

(b)valency

(c)radioactivity

(d)electronegativity

Comment

Answer is: CNA

73.

Which one of the following properties changes with valecny?

(a)atomic weight

(b)equivalent weight

(c)molecular weight

(d)density

Comment

Answer is: BNA

74.

Which one of the following is an element which never exhibits positive oxidation state in any of its compounds?

(a)Oxygen

(b)Chlorine

(c)Fluorine

(d)Carbon

Comment

Answer is: CNA

75.

Which of the following has maximum density?

(a)Chloroform

(b)Water

(c)Benzene

(d)Ice

Comment

Answer is: BNA

76.

The most reactive among the halogens is

(a)fluorine

(b)chlorine

(c)bromine

(d)iodine

Comment

Answer is: ANA

77.

Which one of the following sequence of the chemical elements is correct in terms of the descending order of atomic radius

(a)B-C-N-O

(b)C-B-O-N

(c)N-O-B-C

(d)O-N-C-B

Comment

Answer is: ANA

78.

Which one among the following is the correct order of reactivity of the elements?

(a)Cu > Mg > Zn > Na

(b)Na > Zn > Mg > Cu

(c)Cu > Zn > Mg > Na

(d)Na > Mg > Zn > Cu

Comment

Answer is: DNA

79.

The elements of a group in the periodic table

(a)have similar chemical properties

(b)have consecutive atomic numbers

(c)are isobars

(d)are isotopes

Comment

Answer is: ANA

80.

Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?

(a)Steel > Mercury > Gold

(b)Gold > Mercury > Steel

(c)Steel > Gold > Mercury

(d)Gold > Steel > Mercury

Comment

Answer is: BNA

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Chemistry - Questions and AnswersPage 8

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