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Q:

Charcoal can be made at home by burning

A) wood in absence of air B) coal in absence of air
C) coal in an insufficient supply of air D) wood in an insufficient supply of air
 
Answer & Explanation Answer: A) wood in absence of air

Explanation:
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Filed Under: General Science
Exam Prep: Bank Exams

Q:

Activated Charcoal is used to remove colouring matter from pure substances by_______

A) Bleaching B) Oxidation
C) Adsorption D) Reduction
 
Answer & Explanation Answer: C) Adsorption

Explanation:
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Filed Under: Chemistry
Exam Prep: Bank Exams

Q:

Carbon disulfide is prepared by heating sulfur and charcoal.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Yes, Carbon disulfide is prepared by heating sulfur and charcoal. 


S2 + C ----> CS2

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Subject: Chemistry
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO

Q:

If people sleep in closed rooms where charcoal fire is burning , they die due to 

A) carbon monoxide B) carbon dioxide
C) methane D) phosgene
 
Answer & Explanation Answer: A) carbon monoxide

Explanation:

A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.

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Filed Under: Chemistry

Q:

If in a certain language CHARCOAL is coded as 45164913 and MORALE is coded as 296137, how are the following words coded in that language ? REAL

A) 8519 B) 6713
C) 6513 D) 6719
 
Answer & Explanation Answer: B) 6713

Explanation:

The alphabets are coded as follows :

 

C H A R O L M E4  5 1  6  9 3  2 7

 

R is coded as 6,

 

E as 7,
A as 1  and
L as 3.
So, the code for REAL is 6713

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Filed Under: Coding and Decoding