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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Glass is a.........mixture of metallic...........

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The pH of pure water is nearly 7.It will increase on the addition of

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C) common salt D) hydrochloric acid
 
Answer & Explanation Answer: A) ammonia

Explanation:

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The freezing point of water at 760mm pressure is

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Answer & Explanation Answer: B) 273 K

Explanation:

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Q:

The Kinetic energy of gas molecules

A) is unaffected by temperature variations B) decreases with increase of temperature
C) increases with decrease of temperature D) increases with increase of temperature
 
Answer & Explanation Answer: D) increases with increase of temperature

Explanation:

Kinetic Energy K.E = 12mV2  or 

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Which of the following processes is used to remove reducible oxides from the metal?

A) liquation B) cupellation
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Answer & Explanation Answer: C) poling

Explanation:
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Gold and silver are extracted from their respective ores by _______

A) Smelting B) Roasting
C) Leaching D) Hydro metallurgy
 
Answer & Explanation Answer: D) Hydro metallurgy

Explanation:
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The bleeding of a wound is stopped by the application of ferric chloride because_____

A) Ferric chloride seals the blood vessels B) Blood starts flowing in the opposite direction
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