Sawaal
107
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 radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.

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Chemical composition of cement is

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C) Limestone and Gypsum D) Clay and Gypsum
 
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The most abundant element in the earth's atmosphere is

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Q:

Consider the following constituent gases of the atmosphere :

1. Argon

2. Neon

3. Helium

4.Ceirbon dioxide

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Answer & Explanation Answer: B) 1-4-2-3

Explanation:
Composition of Dry Air (Substance, % by volume)
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Oxygen, O2
20.95
Argon, Ar 0.93
Carbon dioxide, CO2 0.033
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Methane, CH4 0.0002
Krypton, Kr 0.00011
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