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 Chemistry Questions

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Q:

Which of the following is the strongest acid?

A) ClCH2COOH B) BrCH2COOH
C) FCH2COOH D) ICH2COOH
 
Answer & Explanation Answer: C) FCH2COOH

Explanation:

Which_of_the_following_is_the_strongest_acid1552992978.jpg image

FCH2COOH is the strongest acid out of all.

Since the electron withdrawing inductive effect (-I effect) of the halogens decreases in the order of F>Cl> Br> I , therefore the acidic strength of the α- halo acids decreases in the same order.

 

FCH2COOH  >  ClCH2COOH   >   BrCH2COOH   >   ICH2COOH.

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Q:

The credit for the discovery of transuranic element goes to

A) Hahn B) Rutherford
C) Seaborg D) Curie
 
Answer & Explanation Answer: C) Seaborg

Explanation:
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Q:

Ethanol is converted into ethoxy ethane,

A) by heating excess of ethanol with conc. H2SO4 at 140°C B) by treating with conc. H2SO4 at room temperature
C) by treating with conc. H2SO4 at 273 K D) by heating Ethanol with excess of conc. H2SO4 at 443 K
 
Answer & Explanation Answer: A) by heating excess of ethanol with conc. H2SO4 at 140°C

Explanation:
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Q:

Which one is the pure element

A) glass B) cement
C) sodium D) None of these
 
Answer & Explanation Answer: C) sodium

Explanation:
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Q:

How many moles are there in 140g of Si (atomic mass of silicon is 28)

A) 5 B) 10
C) 28 D) 140
 
Answer & Explanation Answer: A) 5

Explanation:
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Q:

Which one among the following is the heaviest

A) 1 mole of water molecules B) 1 mole of ammonia molecules
C) 1 mole of sodium atoms D) 1 mole of hydrogen molecules
 
Answer & Explanation Answer: C) 1 mole of sodium atoms

Explanation:
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Q:

Which structural formula represents a dipole?

dipole1526886238.jpg image

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

Explanation:

What is Dipole :

 

when two atoms in a molecule have substantially different electronegativity: One atom attracts electrons more than another, becoming more negative, while the other atom becomes more positive.

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Q:

What are long chains of Carbon Molecules called

A) Ribosomes B) Hydrocarbons
C) Polymers D) None
 
Answer & Explanation Answer: C) Polymers

Explanation:

A small organic molecule (sugars or amino acids), several of which may be bonded together to form a chain called a polymer.

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