What products are formed when $1 \ mol$ of calcium phosphide reacts with an excess of water?

The effect due to a uniform magnetic field on a freely suspended magnetic needle is as follows:

Which of the following pairs of substances illustrates the law of multiple proportions?

$A$ $2 ~kg$ ball moving at $24 ~ms^{-1}$ undergoes an inelastic head-on collision with a $4 ~kg$ ball moving in the opposite direction at $48 ~ms^{-1}$. If the coefficient of restitution is $2/3$,what are their velocities in $ms^{-1}$ after the impact?

An ideal coil of $10 \, H$ is connected in series with a resistance of $5 \, \Omega$ and a battery of $5 \, V$. $2 \, s$ after the connection is made,the current flowing (in ampere) in the circuit is:

$74.5 \ g$ of a metallic chloride contain $35.5 \ g$ of chlorine. The equivalent weight of the metal is