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Physics, Chemistry and Biology: Post your doubts here!

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Is there any logical way to know color of salts or we just have to memorize
Also is there any rule to which salts are soluble or not like based on reactivity or any property of the reactants
 
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for S11_qp_13: All Nitrate salts are soluble in water, silver chloride is insoluble and so is barium sulfate, so it cannot be A, C or D, hence answer is B
for W09_qp_6: Double the volume, hence reaction time will be longer resulting in temperature change being slower at half the rate, temp change will be half since rate is half
 
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for S11_qp_13: All Nitrate salts are soluble in water, silver chloride is insoluble and so is barium sulfate, so it cannot be A, C or D, hence answer is B
for W09_qp_6: Double the volume, hence reaction time will be longer resulting in temperature change being slower at half the rate, temp change will be half since rate is half
got it
thank you
 
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one more question sorry
if they don't specify in the question whether the source is ac or dc then is this how you draw it??
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