Sawaal
106
Q:

Boron cannot form which one of the following anions?

(1) BO2-

(2) BF63-

(3) BH4-

(4) B(OH)4-

A) Option 1 B) Option 2
C) Option 3 D) Option 4

Answer:   B) Option 2



Explanation:

Due to absence of low lying vacant d orbital in B, sp3d2hybridization is not possible hence BF63-will not formed. 

Subject: Chemistry
Exam Prep: AIEEE
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A) Ionic bond B) Covalent bond
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The difference between a nuclear reactor and atomic bomb is that ___________

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Answer & Explanation Answer: B) the chain reaction in nuclear reactor is controlled

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Wavelength of which of the following colours of the visible spectrum of light are maximally  absorbed by green plants________

A) Green and Yellow B) Red and Blue
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Answer & Explanation Answer: B) Red and Blue

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A mixture of sand and naphthalene can be seperated by __________

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Answer & Explanation Answer: B) Sublimation

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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
 
Answer & Explanation Answer: C) chromic acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide Fe3O4on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive. 

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2 3765
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Which of the following is used to preserve specimens in the biology laboratory?

A) Phenol B) Benzaldehyde
C) Formaldehyde D) Acetic acid
 
Answer & Explanation Answer: C) Formaldehyde

Explanation:

A 40% solution of Formaldehyde known as Formalin is used in the preservation of biological specimens because of its hardening action on proteins. 

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3 3082
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PAS  is a drug used in the treatment of 

A) tuberculosis B) Cancer
C) typhoid D) malaria
 
Answer & Explanation Answer: A) tuberculosis

Explanation:

Para-amino salicyclic acid (PAS) is used in the treatment of Tuberculosis.

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Q:

Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to

A) dehydration B) oxidation
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Answer & Explanation Answer: B) oxidation

Explanation:

Saw dust contains carbon which is oxidised to carbon  dioxide by concentrated nitric acid;

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