Which of the following metal carbonates decomposes upon heating?

$A$ road is $10\,m$ wide. Its radius of curvature is $50\,m$. The outer edge is raised above the inner edge by a distance of $1.5\,m$. This road is most suited for a velocity of ......... $m/s$. (in $.5$)

In a triangle $ABC$,if the midpoints of sides $AB, BC, CA$ are $(3,0,0), (0,4,0), (0,0,5)$ respectively,then $AB^2 + BC^2 + CA^2 = $

The length of the subtangent at any point $(x_1, y_1)$ on the curve $y=5^x$ is

The network shown in the figure is part of a complete circuit. If at a certain instant,the current $I$ is $5 \ A$ and it is decreasing at a rate of $10^3 \ A \ s^{-1}$,and if $I$ is reversed in direction,then $V_B - V_A$ equals .......... $V$.

If $\alpha$ and $\beta$ are imaginary cube roots of unity,then the value of $\alpha^4 + \beta^{28} + \frac{1}{\alpha\beta}$ is: