GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 118

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 118

1171). The ground state energy of the electron hydrogen atom is 13.6 eV. The energy of the state n = 2 is

A). 13.6 eV

B). 6.8 eV

C). 4.5 eV

D). 3.4 eV

Answer: 3.4 eV

   

1172). Consider the following statements: .

l. Diamond is a bad conductor of electricity.

ll. Graphite is used for making electrodes of electric furnaces.

lll. Solid carbon monoxide is known as dry ice.

IV. Carbon dioxide turns most litmus us slightly bluish.

Which of the above statement is/are correct?

A). (l) and (Ill)

B). (ll) and (Ill)

C). (I) and (II)

D). (III) and (IV)

Answer: (I) and (II)

   

1173). Match List I with List ll correctly and select your answer using the codes given below:

List .1 (Ores)                   List II (Metals)

a) Haematite                    1) Lead

b) Cinnabar                      2) Iron

c) Calamine                      3) Mercury

d) Galena                         4) Zinc

Codes:

a b c d

A). 2 3 4 1

B). 3 2 1 4

C). 2 4 3 1

D). 4 2 1 3

Answer: 2 3 4 1

   

1174). Critically observe the reaction and choose the correct RQ from the options given below:

C15H24O2+25.5O218CO2+17H2O

The correct RQ of this reaction is

A). 0.071

B). 0.71

C). 7.1

D). 71

Answer: 0.71

   

1175). Which of the following statements is not correct?

A). An increase in oxidation number of an element implies that the element has undergone oxidation.

B). An increase in oxidation number of an element implies that it has undergone reduction.

C). The oxidation number of an element can be a fraction.

D). Oxidation number of an element is a positive or negative integer.

Answer: An increase in oxidation number of an element implies that it has undergone reduction.

1176). Choose the correct order the increase in the oxidation number of iodine in the following compounds: I2, HI, HIO4 and ICl

A). I2, HI, ICl, HIO4

B). HI, ICl, HIO4, I2

C). HI, I2, ICl, HIO4

D). HIO4, ICl, I2, HI

Answer: HI, I2, ICl, HIO4

   

1177). Examine the following statements carefully and select the answer using the code given below:

Assertion (A): Boron carbide is used to make bullet-proof clothing.

Reason (R1): It is an intestitial carbide and has isosahedral structure.

Reason (R2) : The fibres of them have enormous tensile strength.

A). All (A), (R1) and (R2) are correct

B). (A) is correct, (R1) is the correct explanation for (A) and (R2) is incorrect.

C). (A) is correct both (R1) and (R2) are correct but cannot explain (A).

D). (A) is correct, (R1) is incorrect but (R2) is the correct explanation for (A)

Answer: (A) is correct, (R1) is incorrect but (R2) is the correct explanation for (A)

   

1178). Consider the following statements:

Assertion (A): in nature Ag and Pb occur as oxides and not as sulphides.

Reason (R): The cations of Ag and Pb can polarise O^2- ion easily than S^2 ion.

Now select your answer according to the coding scheme given below:

A). Both (A) and (R) are true and (R) is the correct explanation of (A)

B). Both (A) and (R) are true, but (R) is not the correct explanation of (A)

C). (A) is true, but (R) is false

D). Both (A) and (R) are false

Answer: Both (A) and (R) are false

   

1179). The oxidant used in the testing of alcohol in breadth is

A). MnO2

B). KMnO4

C). K2Cr2O7

D). KNO3

Answer: K2Cr2O7

   

1180). Sulphide ores are concentrated by

A). hand picking

B). magnetic separation

C). gravity separation

D). froth floatation

Answer: froth floatation