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Answer:
1)H2S+Zn---->ZnS+H2
2)2Pb(NO3)2--------->on heating gives 2PbO+4NO2+O2
3)When two liquids do not mix, they form two separate layers and are known as immiscible liquids. These two liquids can be separated by using a separating funnel. It will separate the immiscible liquids into two distinct layers depending on their densities. The heavier liquid forms the lower layer while the lighter one forms the upper layer. Kerosene has lower density than water and hence forms the upper layer
4)The solution turns pink in color.
5)2Mg+O2--->2MgO
6)Fe+CuSO4---->FeSO4+Cu
7)Lime stone is also known as calcium carbonate has chemical formula . So, when we strongly heat limestone then it decomposes to give slaked lime (CaO) and carbon dioxide.The chemical reaction equation will be as follows. Calcium oxide (CaO) is also known as quick lime. This reaction is a decomposition reaction.
8)When hydrogen peroxide is exposed to sunlight it decomposes to water and colourless, odourless gas oxygen is evolved
9)BaCl2+NaSO4---->NaCl2+BaSO4
10)H2S+CuSO4---->CuS+H2SO4
Very Very important questions to be prepared for students writing BOARD exmainations.