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
Q:

Which one of the following substances does not have a melting point

A) bromine B) sodium chloride
C) mercury D) glass
 
Answer & Explanation Answer: D) glass

Explanation:
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Filed Under: Chemistry

68 19853
Q:

Which one of the following mixture is homogeneous

A) starch and sugar B) methanol and water
C) graphite and charcoal D) calcium carbonate and calcium bicarbonate
 
Answer & Explanation Answer: B) methanol and water

Explanation:
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Filed Under: Chemistry

76 18960
Q:

Which of the following is an element

A) alumina B) brass
C) graphite D) silicon
 
Answer & Explanation Answer: D) silicon

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Filed Under: Chemistry

0 3730
Q:

Among the given nutrients, milk is a poor source of

A) Calcium B) Protein
C) Vitamin C D) Carbohydrates
 
Answer & Explanation Answer: C) Vitamin C

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Filed Under: Chemistry

178 32093
Q:

Which one of the following is not a mixture

A) air B) mercury
C) milk D) cement
 
Answer & Explanation Answer: B) mercury

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Filed Under: Chemistry

179 33461
Q:

' Misch metal ' is widely used in manufacture of which of the following

A) Material of car brake B) Smoke detectors
C) Cigarette lighters D) Emergency lights
 
Answer & Explanation Answer: C) Cigarette lighters

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Filed Under: Chemistry

49 15943
Q:

The isotopes of chlorine with mass number 35 and 37 exist in the ratio of

A) 1:2 B) 2:3
C) 3:1 D) 3:4
 
Answer & Explanation Answer: C) 3:1

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Filed Under: Chemistry

78 14124
Q:

A gas is found to have the formula . Its vapour density is 70.The value of n must be

A) 5 B) 4
C) 9 D) 6
 
Answer & Explanation Answer: A) 5

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3 3895