The keys are based on contrasting characters generally in a pair called . . . . . . .

$A$ plane $x$ passes through the point $(1, 1, 1)$. If $b, c, a$ are the direction ratios of a normal to the plane, where $a, b, c$ $(a < b < c)$ are the factors of $2001$, then the equation of the plane is

The charge on $As_2S_3$ sol is due to the adsorbed

The oxide of a metal contains $40 \%$ of oxygen. The valency of the metal is $2$. What is the atomic weight of the metal?

Which of the following figures represents the variation of particle momentum $p$ and the associated de-Broglie wavelength $\lambda$?

The wavelengths of electron waves in two orbits is $3: 5$. The ratio of kinetic energy of electrons will be