Question

Q 1 . The marble statues often slowly get corroded when kept in open for a long time .Assign a suitable explanation
Q 2. You are given the following materials
 (1) marble chips (2)dilute hydrochloric acid (3)Zinc granules ,identify the type of reaction when marble chips and Zinc granules are added separately to acid taken in two test tubes
Q3. The gases hydrogen & chlorine do not react with each other even if kept together for a long time . However , in the presence of sunlight , they readily combine . What does actually happen ?
Q 4. A,B&C are three elements which undergo chemical reactions in the following way
A2O3 + 2BB2O3 + 2A                   3CSO4 + 2B - B2(SO4)3 + 3C                   3CO+ 2A A2O3 +3C
Answer the following (A) Which element is most reactive ?        (B) Which element is least reactive ?
Q 5. A water insoluble substance ‗X‘ on reacting with dilute H2SO4 released a colourless and odourless gas accompanied by brisk effervescence. When the gas was passed through water , thesolution obtained turn blue litmus red . On bubbling the gas through lime water , it initially became milky and the milkiness disappeared when the gas was passed in excess . Identify the substance ‗X‘ and write the chemical equations of the reaction involved
Q 6. If you collect  silver coins and copper coins. After some day a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name of black and green coatings
Q.7. 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.​

Answer 1

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