Ncert Solutions Chemistry Class 11th
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The ionic radii of K?, Na?, Al³? and Mg²? are in the order
The ionic radii of K?, Na?, Al³? and Mg²? are in the order
When positive charge increases, ionic radii decreases in isoelectronic ions
Al?³ < Mg?² < Na? < K?
Upvote 
The number of significant figure in 0.00340 is __________.
The number of significant figure in 0.00340 is __________.
Number of significant figure in 0.00340 are 3.
Upvote Which one of the following compounds of Group-14 elements is not known?
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Which one of the following compounds of Group-14 elements is not known?
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[SiCl?]?² is not known because six larger chloride ions can't be accomodated around Si? due to its small size.
Upvote Which one of the following metals forms interstitial hydride easily?
Which one of the following metals forms interstitial hydride easily?
Metal of group 7, 8, & 9 dose not form interstitial hydride this is called hydride gap.
Mn → group - 7
Fe → group - 8
Co → group - 9
So, Cr will forms interstitial hydride.
Upvote 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:
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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:
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Li? CO? decomposes easily on heating as;
Li? CO? - (Δ)-> Li? O + CO? ↑
NaHCO? is used in dry fire extinguishers.
K is most abundant element in cell fluid.
CsI is least soluble due to smaller hydration energy of Cs? & I?
Upvote 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.
<!-- [if !supportLineBreakNewLine]--><!--[endif]-->For the above statements choose the correct answer from the options given below:
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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.
<!-- [if !supportLineBreakNewLine]--><!--[endif]-->For the above statements choose the correct answer from the options given below:
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CFC breakdown by visible light to give Cl radical which react with stratospheric ozone.
CFC, CF? Cl? - (hv)-> Cl• + •CF? Cl
Cl• (g) + O? → ClO• + O?
ClO• + O → Cl• + O?
Atmospheric ozone reacts with NO to give NO? and O?
O? + NO → NO? + O?
Upvote For a chemical reaction A + B C + D
the entropy change depends on the temperature T (in K) as
Minimum temperature at which it will become spontaneous is-------------K. (Integer)
For a chemical reaction A + B C + D
the entropy change depends on the temperature T (in K) as
Minimum temperature at which it will become spontaneous is-------------K. (Integer)
For a reaction to be spontaneous;
So, minimum T at which reaction will be spontaneous is 200 K.
Upvote A certain gas obeys The value of The value of x is------------.
(Integer answer) (Z : compressibility factor)
A certain gas obeys The value of The value of x is------------.
(Integer answer) (Z : compressibility factor)
Statements about heavy water are given below
(a) Heavy water is used in exchange reaction for the study of reaction mechanisms.
(b) Heavy water is prepared by exhaustive electrolysis of water
(c) Heavy water has higher boiling point than ordinary water.
(d) Viscosity of H2O is greater than D2O.
Choose the most appropriate answer from the options given below:
Statements about heavy water are given below
(a) Heavy water is used in exchange reaction for the study of reaction mechanisms.
(b) Heavy water is prepared by exhaustive electrolysis of water
(c) Heavy water has higher boiling point than ordinary water.
(d) Viscosity of H2O is greater than D2O.
Choose the most appropriate answer from the options given below:
Heavy water (D2O) is used in organic reaction to know the kinetics of reaction
Heavy water D2O is obtained by repeated electrolysis of H2O.
Heavy water has b.pt 101.4°C and ordinary water has b.pt 100°C
(b.pt of D2O > b.pt of H2O)
D2O has more molecular mass than H2O, so greater degree of association a
Upvote Which of the following vitamin is helpful is delaying the blood clotting?
Which of the following vitamin is helpful is delaying the blood clotting?
Vitamin E is helpful in delaying blood clotting while vitamin K help blood clotting.
Upvote