Home/Class 11/Chemistry/

Question and Answer

The precipitate of \(CaF_{2}(K_{sp} =1.7\times 10^{-10})\) is obtained when equal volumes of the following are mixed
(A) \(10^{-4}M Ca^{2+}+10^{-4}M F^{-}\)
(B) \(10^{-2}M Ca^{2+}+10^{-3}M F^{-}\)
(C) Both A and B
(D) None of these
loading
settings
Speed
00:00
09:15
fullscreen
The precipitate of \(CaF_{2}(K_{sp} =1.7\times 10^{-10})\) is obtained when equal volumes of the following are mixed
(A) \(10^{-4}M Ca^{2+}+10^{-4}M F^{-}\)
(B) \(10^{-2}M Ca^{2+}+10^{-3}M F^{-}\)
(C) Both A and B
(D) None of these

Answer

Answer: B
The expression for the solubility product of \(CaF_2\) is \(K_{sp}=[Ca^{2+}][F^-]^2=1.7\times 10^{-10}\).

When equal volumes of \(10^{-4}M Ca^{2+}\)and\(10^{-4}M F^{-}\) are mixed.

\([Ca^{2+}][F^-]^2=(10^{-4})(10^{-4})^2=10^{-12}<1.7\times 10^{-10}\)

Thus the ionic product is less than the solubility product. Hence precipitation will not occur.

When equal volumes of \(10^{-2}M Ca^{2+}\)and\(10^{-3}M F^{-}\) are mixed.

\([Ca^{2+}][F^-]^2=(10^{-2})(10^{-3})^2=10^{-8}>1.7\times 10^{-10}\)

Thus the ionic product is more than the solubility product. Hence precipitation will occur.

Option B is correct.
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play

Solution

When ionic product is greater than \(K_{sp}\) then precipitation occur
\(K_{sp} < 10^{-2} M\ Ca^{2+} +10^{-3}M \ F^-\) 
To Keep Reading This Solution, Download the APP
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Solution, Download the APP
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
Correct15
Incorrect0
Watch More Related Solutions
Density of heavy water is maximum at:

(A) \(3.82^{o}C\)
(B) \(101.42^{o}C\)
(C) \(11.6^{o}C\)
(D) \(4^{o}C\)
The number of protons, electrons and neutrons respectively in a molecule of heavy water is:

(A) \(10, 10, 10\)
(B) \(8, 10, 11\)
(C) \(10, 11, 10\)
(D) \(11, 10, 10\)
Silver ore + \(CN^-+H_2O \xrightarrow [ ]{O_2 } \) \([P]+OH^-\)
\(\downarrow Zn\)
\([Q]+Ag\)
In the process of extraction of silver, identify the complexes [P] and [Q].
(A) \(P=[Ag(CN)_4]^-, Q =[Zn(CN)_4]^{2-}\)
(B) \(P=[Ag(CN)_4]^-, Q =[Zn(CN)_6]^{4-}\)
(C) \(P=[Ag(CN)_4]^{3-}, Q =[Zn(CN)_4]^{2-}\)
(D) \(P=[Ag(CN)_2]^-, Q =[Zn(CN)_4]^{2-}\)
The line spectrum is a characteristic of:

(A) atoms
(B) molecules
(C) any substance in the solid state
(D) any substance in the liquid state
The fringe width of interference fringes for redcolour is \(\beta \). The fringe width for violet colourwill be nearly :
\((\lambda_{Red} = 620-740 nm, \lambda _{Violet} = 380-450 nm)\)

(A) \(\beta \)
(B) 2\(\beta \)
(C) \(\dfrac{\beta }{4}\)
(D) \(\dfrac{\beta }{2}\)
Which of the following is considered production in economics?
(A) Painting a picture for pleasure
(B) Preventing a child from falling into a man-hole on the road
(C) Singing a song before friends
(D) Tilling of soil
Agreement to share profits in a partnership firm ___________.
(A) must be coupled with an agreement to share losses
(B) is same as agreement to share losses
(C) implies an agreement to share losses
(D) does not necessarily mean an agreement to share losses
Evaluate \({\left( {{{17}^2} - {8^2}} \right)^{\frac{1}{2}}}\)
(A) 15
The value of \(\Delta G^{o}\) for the phosphorylation of glucose in glycolysis is \(13.8 kJ/mol\). Find the value of \(K_c\) at \(298\)K.
Which of these is a feature of an under-developed economy?
(A) Pre-dominance of Agricultural Sector
(B) Wide-spread Poverty
(C) Low Ability to Save
(D) All of the above

Load More