Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
[question] Question. Why does the colour of copper sulphate solution change when an iron nail is dipped in it? [/question] [solution] solution: When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour. Therefore, the blue colour of copper sulphate solution fades and green colour appears. [/solution]...
Read More →The volume of a right circular cone is $9856 \mathrm{~cm}^{3}$.
[question] Question. The volume of a right circular cone is $9856 \mathrm{~cm}^{3}$. If the diameter of the base is $28 \mathrm{~cm}$, find (i) height of the cone (ii) slant height of the cone (iii) curved surface area of the cone $\left[\right.$ Assume $\left.\pi=\frac{22}{7}\right]$ [/question] [solution] Solution: (i) Radius of cone $=\left(\frac{28}{2}\right) \mathrm{cm}=14 \mathrm{~cm}$ Let the height of the cone be h. Volume of cone $=9856 \mathrm{~cm}^{3}$ $\Rightarrow \frac{1}{3} \pi r^{...
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