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Asked/Added Questions From NCERT: Chemistry


Question 1. Asked on :07 October 2020:05:56:02 PM

 The temperature of a gas rises during an adiabatic compression, although no heat is given to the gas from out side. Why? 

-Added by Shruti Srivastva Chemistry » Thermodynamics

Answer by: nisha sheikh

nisha sheikh
Temperature of gases changes only when internal energy of the gases changes. Temperature of the gas is related to du by du = nCvΔT. Hence for all those infinite possible values of du, you will have infinite possible temperatures, still maintaining constant net heat of the system . i.e dq as zero.

-Answered by nisha sheikh On 21 October 2020:06:50:47 PM


Question 2. Asked on :03 October 2020:05:26:18 PM

Why an ice box is constructed with a double wall? 

-Added by Shruti Srivastva Chemistry » Thermal Properties Of Matter

Answer by: Shruti Srivastva

Shruti Srivastva
An ice box is made of double wall and the space between the walls is filled with some non-conducting material to provide heat insulators, so that the loss of heat can be minimised.

-Answered by Shruti Srivastva On 03 October 2020:05:27:03 PM


Question 3. Asked on :12 September 2020:05:53:51 PM

Account for Bond dissociation energy of F2 is less than that of Cl2.

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Shruti Srivastva

Shruti Srivastva
Due to smaller size of F than Cl as a result of which electron-electron repulsions between the lone pairs of electrons are very large than that of Cl, hence bond dissociation energy of Fis less than that of Cl2.

-Answered by Shruti Srivastva On 12 September 2020:05:55:10 PM


Question 4. Asked on :12 September 2020:05:51:14 PM

Explain the role of Cryolite in the electrolytic reduction of alumina. 

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Shruti Srivastva

Shruti Srivastva
Lower the melting point of the mixture and brings conductivity. 

-Answered by Shruti Srivastva On 12 September 2020:05:52:37 PM


Question 5. Asked on :12 September 2020:05:50:10 PM

Give ann example of elastomers. 

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Shruti Srivastva

Shruti Srivastva
Buna-S, Buna-N.

-Answered by Shruti Srivastva On 12 September 2020:05:50:54 PM


Question 6. Asked on :12 September 2020:05:49:24 PM

What is an alkylamine more basic than ammonia? 

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Rohit Rajput

Rohit Rajput
 This is because of electron releasing tendency of alkyl group. The alkyl group shows +I effect which increases the electron density at N atom in alkyl amine which makes it more basic than ammonia.

-Answered by Rohit Rajput On 26 September 2020:07:19:07 PM


Question 7. Asked on :12 September 2020:05:45:37 PM

What is Bi a stronger oxidant than Sb? 

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Shruti Srivastva

Shruti Srivastva
The stability of the +5 oxidant state decreases and that of +3 state increases due to the inert pair effect down the group therefore Bi accepts two electrons and get reduced to Bi. 

-Answered by Shruti Srivastva On 12 September 2020:05:46:50 PM


Question 8. Asked on :12 September 2020:05:42:17 PM

Why is the forth flotation method selected for the concentration of sulphide ores? 

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Shruti Srivastva

Shruti Srivastva
Because the method is based on preferential wetting properties with the frothing agent and water, and the suphide particles of res stick to the oil droplets and rise in the form of forth. 

-Answered by Shruti Srivastva On 12 September 2020:05:43:21 PM


Question 9. Asked on :12 September 2020:05:41:18 PM

Define the term "Tyndall effect".

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: nisha sheikh

nisha sheikh
Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room, which makes visible a light beam entering a window.

-Answered by nisha sheikh On 20 September 2020:06:57:34 PM


Question 10. Asked on :12 September 2020:05:39:05 PM

Which point defect in crystals doesn't alter the density of the relevant solid? 

-Added by Shruti Srivastva Chemistry » Chemistry

Answer by: Shruti Srivastva

Shruti Srivastva
Frenkel defect. 

-Answered by Shruti Srivastva On 12 September 2020:05:40:59 PM


 

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