Sawaal

 Chemistry Questions

Popular Latest Rated
Q:

Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to

A) dehydration B) oxidation
C) reduction D) dehydrogenation
 
Answer & Explanation Answer: B) oxidation

Explanation:

Saw dust contains carbon which is oxidised to carbon  dioxide by concentrated nitric acid;

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

30 9969
Q:

Baking soda is used ______.

 

I. for making baking powder

II. in soda-acid fire extinguishers

III. to neutralize excess acid in the stomach

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

2 9913
Q:

What is the position of metallic ion and non-metallic ion in a chemical formula?

 

A) Metal ion at second position B) Non-metal ion at first position
C) Metal ion at first and non-metal ion at second position D) No option is correct
 
Answer & Explanation Answer: C) Metal ion at first and non-metal ion at second position

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

1 9891
Q:

The difference between a nuclear reactor and atomic bomb is that ___________

A) no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction B) the chain reaction in nuclear reactor is controlled
C) the chain reaction in nuclear reactor is not controlled D) no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor
 
Answer & Explanation Answer: B) the chain reaction in nuclear reactor is controlled

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

25 9751
Q:

An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number

A) 25 B) 27
C) 35 D) 43
 
Answer & Explanation Answer: C) 35

Explanation:

According to Bohr model, Each shell can occupy 2n2 electrons in their orbits where n=1,2,3.. for K,L,M,..

 

The atom has 2 electrons in k, 8 electrons in L and 7 electrons in M = 2 + 8 + 7 = 17

 

And given that its nucleus has 18 neutrons

 

=> its mass number = number of (electrons + neutrons ) = 17 + 18 = 35

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

45 9710
Q:

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
C) Blood reacts and a solid is formed which seals the blood vessels D) Blood is coagulated and the blood vessels are sealed
 
Answer & Explanation Answer: D) Blood is coagulated and the blood vessels are sealed

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

36 9664
Q:

Which are two chemicals used to purify water?

A) Chlorine & Fluorine B) Fluorine & Iodine
C) Chlorine & Hydrogen peroxide D) Fluorine & Iodine
 
Answer & Explanation Answer: C) Chlorine & Hydrogen peroxide

Explanation:

Removing the contaminents if any in the water which causes harm to our health is involved in the purifying of water. 

 

This process involves chemicals. Chloramines, Hydrogen peroxide, Iodine are the chemicals which are used in purifying water.

Report Error

View Answer Report Error Discuss

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

1 9548
Q:

Li3PO4 compound name?

A) Lithium perchlorate B) Lithium phyrite
C) Lithium phosphate D) None
 
Answer & Explanation Answer: C) Lithium phosphate

Explanation:

The given compund Li3PO4 name is Lithium phosphate.

 

Lithium phosphate is a white crystal at room temperature. It is slightly soluble in water.

It  can be used to produce glass, disk, colorful phosphor powder. It can also be used as a catalyst in some reactions.

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams
Job Role: Analyst , Bank Clerk

5 9519