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some chemistry questions?
i was doing some model papers for icse 10th. i can't find these answers anywhere. here are the questions-
1Distinguish between potassium nitrate and nitirite using chemical reaction
2complete the following reaction- bleaching powder + dil. nitric acid→
3give names of 2 -
a. non-volatile acids
b. strong dibasic acids
4 what is the observation when chlorine is passed through KI solution?
5differentiate between attackable and non-attackable electrodes
6name a powder that is orange red when hot and yellow when cold and gives off SO2.
7why is HCl acid not very expensive?
8Why is there a chance of explosion when HCl gas is led into water by a glass tube?
9what property do ammonium salts have in common except decomposing when heated
10what happens when nitric acid reacts with saw dust?
11why does nitric acid turns skin yellow
12give equations
a.to obtain nitrous oxide from sodium nitrate
b.to show 2 reactions of zinc sulphate with NaOH under two different conditions
1)place both samples in a strong mineral acid and one will fume red violently (Nitrogen dioxide) . the other will form nitric acid.
2) bleaching powder+ nitric acid---> calcium nitrate + hypochlorous acid. or
Ca(ClO)2 + 2HNO3--->Ca(NO3)2+ 2HClO
3) A)citric acid, tartic acid.
B)oxalic acid, malonic acid
4)potassium chloride and iodine being formed.
5)attackable would not resist corrosion from the products form by electrolysis non attackeable would resist corrosion.
6) ferric sulfate (iron III sulfate)
7)because it is a major industrial by product.
8)no clue
9)high solubilities and ability to loose a hydrogen atom and form ammonia gas.
10)it forms many products including potassium picrate, cellulose nitrates, and even NOx gasses.
11) it reacts with the pigment melenin and forms a nitro compound with it this compound upon nuetralization turns yellow.
12) 2NaNO3--->N2O + Na2O+ 2O2
ZnSO4+2NaOH--->Na2SO4 + Zn(OH)2
ZnSO4+2NaOH--->Na2ZnO2+ H2SO4
gosh ur lucky i like you. wink wink.
nah actually it was fun
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