Fill in the blanks
1) A cannon after firing recoils due to _______________
2) Magnesium ribbon on burning produces an ash. The colour of the ash is ____________
3) What happens when a solution of sodium sulphate is added to barium chloride___________
4) Akash observed an onion peel under the microscope. The peel was stained and it appeared pink in colour. The stain used is_____________________

2
Physics ?
actually its under the category of science but such category does not exist
a majority of questions were from chemistry hence i titled it chemistry

Answers

2014-09-21T15:00:20+05:30

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1) A cannon after firing recoils due to Force exerted by cannon ball on the cannon.
    A cannon after firing recoils due to Conservation of linear momentum
    A cannon after firing recoils due to Newton's third Law of motion.

2) Magnesium ribbon on burning produces an ash. The color of the ash is bright white.
    The powder is Magnesium Oxide (Mg O).

3) Na₂ SO₄ (aqua) + Ba Cl₂ (aqua) -> 2 Na Cl (solid) + Ba SO₄ (solid)
    In solution sodium and sulfate exist as ions. Barium and chloride also dissociate into ions.  Insoluble Barium Sulfate precipitate is formed.  These are white crystals.
   
4) The stain used is perhaps iodine. I am not sure whether iodine results in purple stain or pink.


0
what about the third n fourth question?
hey can u tell me the answer?(question 3 n 4????
2014-09-21T15:05:33+05:30
Due to Newton's third law of motion.
2.Magnesium ribbon on burning produces an ash. The colour of the ash is
 White.
3.When the solution of sodium sulphate is added to barium chloride we see displacement reaction.And it becomes sodium chloride and barium sulphate.
4. Dont know but i can guess Alcohol.
0
the last question carries options n they r 1 glycerine 2 methyl orange 3 iodine 4 safraine
it should be glycerine or safraine
so what is the exact answer?
glycerine
thanks