A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol in 2 hours is :
[Given : Molar mass : Na = 23.0 g mol$$-$$1 ; Cl = 35.5 g mol$$-$$1]
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The first ionization enthalpy for oxygen is lower than that of nitrogen.
Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion.
In the light of the above statements, choose the correct answer from the options given below.
Match List I with List II.
List-I Ore |
List-II Composition |
||
---|---|---|---|
(A) | Siderite | (I) | FeCO$$_3$$ |
(B) | Malachite | (II) | CuCO$$_3$$ . Cu(OH)$$_2$$ |
(C) | Sphalerite | (III) | ZnS |
(D) | Calamine | (IV) | ZnCO$$_3$$ |
Choose the correct answer from the options given below :
Given below are two statements.
$$\bullet$$ Statement I : In CuSO4 . 5H2O, Cu-O bonds are present.
$$\bullet$$ Statement II : In CuSO4 . 5H2O, ligands coordinating with Cu(II) ion are O-and S-based ligands.
In the light of the above statements, choose the correct answer from the options given below.