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Q1 A student dropped few pieces of marble in dilute HCl contained in a test tube. The evolved gas was then passed through lime water. What change would be

observed in lime water? Write balanced chemical equation for both the changes observed.

Q2 An aqueous solution of metal nitrate P reacts with sodium bromide solution to form yellow ppt of compound Q which is used in photography. Q on exposure to sunlight undergoes decomposition reaction to form metal present in P along with reddish brown gas. Identify P&Q. Write the chemical reaction & type of chemical reaction.

Q3 ​​A reddish brown vessel developed a green coloured solid X when left open in air for a long time. When reacted with dil H2SO4 , it forms a blue colored solution along with brisk effervescence due to colourless & odourless gas Z. X decomposes to form black colored oxide Y of a reddish brown metal along with gas Z, Identify X, Y, & Z.

Please help with the above questions. Need to ASAP!!! It's very urgent, please..... Somebody help with relevant answers!!


1.  Ca(OH)2 + 2HCL -------  CaCl2 + 2H20
2. AgCl + Br2 ------ AgBr2 + Cl
3. sorry don't know
2 3 2
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