2
Q:

# In addition to nitric acid, another acid which may render iron passive is

 A) acetic acid B) oxalic acid C) chromic acid D) citric acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide $Fe3O4$on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.

Subject: Chemistry
Q:

Which of the following is used to remove the green colour from glass?

 A) Manganese dioxide B) Sulphur dioxide C) Titanium dioxide D) Silicon dioxide

Explanation:

Filed Under: Chemistry
Exam Prep: Bank Exams

0 156
Q:

Which of the following statement(s) is/are CORRECT?

I. Carbon compounds linked by only single bond are called saturated compounds.

II. Carbon compounds having double or triple bonds are called unsaturated compounds.

III. Saturated carbon compounds are more reactive than unsaturated carbon compounds.

 A) Only I and II B) Only I and III C) Only II and III D) All I, II and III

Explanation:

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

0 143
Q:

What is the maximum number of electrons that the  outermost shell can have?

 A) 2 B) 6 C) 8 D) none

Explanation:

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

1 155
Q:

The first electron shell which is the nearest to the nucleus never holds more than 'n' electrons, where 'n' is equal to:

 A) 8 B) 4 C) 6 D) 2

Explanation:

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Exam Prep: Bank Exams

0 119
Q:

What is the atomic mass of Zirconium?

 A) 91.22 B) 89.22 C) 88.22 D) 90.22

Explanation:

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Exam Prep: Bank Exams

2 695
Q:

How many types of isotopes does Scandium have?

 A) 9 B) 7 C) 10 D) 13

Explanation:

Filed Under: Chemistry
Exam Prep: Bank Exams

2 726
Q:

Which of the following has the lowest melting point?

 A) Zinc B) Silver C) Lead D) Tin

Explanation:

Filed Under: Chemistry
Exam Prep: Bank Exams

2 965
Q:

What is the bond angle (in degrees) in the structure of a benzene molecule?

 A) 60 B) 150 C) 90 D) 120