The length of the latus rectum of the parabola $y^2+8x-2y+17=0$ is

$100 \ g$ of water is heated from $30^\circ C$ to $50^\circ C$. Ignoring the slight expansion of the water,the change in its internal energy is ...... $kJ$ (specific heat of water is $4184 \ J/kg/K$).

$A$ metal salt gives a yellow precipitate with potassium chromate in acetic acid and a white precipitate with dilute sulfuric acid. However,it does not give a precipitate with sodium chloride or iodide. What will be the composition of the white precipitate formed when sodium carbonate is added to the solution of the metal salt?

Which of the following compounds does not contain a peroxide ion?

The truth table for the system of four $NAND$ gates as shown in the figure is: