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Chemistry: Post your doubts here!
MgSO4 breaks up into Mg2+ and sulfate ions readily Water however, dissociates to OH- and H+ to a small extent (1 x 10-7 mol/dm3). So if the impact of the OH- ion as the "common ion" is insignificant compared to the Mg2+ ions. -
Chemistry: Post your doubts here!
There are 2 stages in the reaction STAGE 1: the breaking of the H-X bonds STAGE 2: forming of the H-H and X-X bonds. The rate is limited by how easy STAGE 1 (breaking of the H-X) occurs. Statement 1 and 2 is related to the weakness of the H-X bonds (STAGE 1) Statement 3 takes about the... -
Chemistry Topical MCQs 2002 -2014 (Except for Organic Chemistry)
Good effort. Would be really useful. -
Chemistry: Post your doubts here!
The variables are size of cation and size of anion, during comparison, keep one variable to be the same. same size cation, increasing size of anion --> decomposition temperature decreases increasing size of cation, same size anion --> decomposition temperature decreases -
Chemistry: Post your doubts here!
Did this come from an actual question? If so, do post the whole question. -
Chemistry: Post your doubts here!
Do you mean equilibrium concentration or equilibrium constant? And what is meant by "increasing of volume"? -
Chemistry: Post your doubts here!
In your working, you should have wrongly used 100 as the dominator rather than 10. -
Chemistry: Post your doubts here!
I think you have asked similar questions on this? This question is on intermolecular forces of attraction. HCl has the strongest intermolecular attraction (PD-PD) compared to the other options (VDW). ammonium salt + base --> salt + water + ammonia It is "bad" because, the nitrogen nutrient... -
Chemistry: Post your doubts here!
Actually, the most straightforward way to tackle this question is to refer to the list of IE and ionic radii in the data booklet as suggested by the question, and see which option fits the description. -
Chemistry: Post your doubts here!
Option C Mr contributed by H = numer of atoms x Ar= 16 x 1 = 16 Mr contributed by O = number of atoms x Ar= 1 x 16 =16 -
Chemistry: Post your doubts here!
1- tertrahederal 2- trigonal planar 3- bent -
Chemistry: Post your doubts here!
I don't have the data booklet now to confirm, radical C comes from the breaking of C -Cl bond, compared to the other bonds in the other options, it should be the easiest to break. A and B involves the breaking of C-F bond. D involves breaking C-H bond. -
Chemistry: Post your doubts here!
All options are possible as they have less carbons than octene. Chemistry: Post your doubts here! -
Chemistry: Post your doubts here!
It is not really the textbook display of the mechanisms, but here is an idea of how the changes occurred. -
Chemistry: Post your doubts here!
what year and variant is this from? -
Chemistry: Post your doubts here!
Hydrating of lime is an exothermic reaction. You can also view it backwards, if you have Ca(OH)2, how would you drive away the water to form CaO and H2O? You need to heat it. So the reverse reaction below is exothermic (the forward reaction is endothermic). Ca(OH)2 + heat <--> CaO + H2O -
Chemistry: Post your doubts here!
1st statement is true as the complete ionization of H2SO4 provides 1 mol/dm3 of H+. 2nd statement is false as sulfate ions is contributed by 2nd reaction. And the clue of it being a weak acid means the forward direction is not favored. -
Chemistry: Post your doubts here!
Unfortunately, there are no short cuts except to sketch them out. -
Chemistry: Post your doubts here!
This is actually correct. The 8 electrons are "lost" by the two sulfur atoms, so each sulfur atom increased its oxidation state by 4 units.