Ncert Solutions Chemistry Class 11th

A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is __________ J. (Nearest integer)

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Lithium halides are some what covalent is nature.
Reason R: Lithium possess high polarisation capability.
In the light of the above statements, choose the most appropriate answer from the options given below:

Match List- I with List-II:

The ionic radii of K?, Na?, Al³? and Mg²? are in the order

The number of significant figure in 0.00340 is __________.

Which one of the following compounds of Group-14 elements is not known?

Which one of the following metals forms interstitial hydride easily?

Match List – I with List – II:
| List - I (Elements) | List - II (Properties) |
|---|---|
| (a) Li | (i) Poor water solubility of I? salt |
| (b) Na | (ii) Most abundant element in cell fluid |
| (c) K | (iii) Bicarbonate salt used in fire extinguisher |
| (d) Cs | (iv) Carbonate salt decomposes easily on heating |
Choose the correct answer from the options given below:

Given below are two statements:
Statement I: Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.
Statement II: Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.
For the above statements choose the correct answer from the options given below:

For a chemical reaction A + B $?$ C + D

$\left({\Delta }_r{H}^{\Theta }=80kJmo{l}^{-1}\right)$ the entropy change ${\Delta }_r{S}^{\Theta }$ depends on the temperature T (in K) as ${\Delta }_r{S}^{\Theta }=2T\left(J{K}^{-1}mo{l}^{-1}\right).$

Minimum temperature at which it will become spontaneous is-------------K. (Integer)