Which of the following is not done in a wildlife sanctuary?

Who was the first scientist to use the term 'virus' as a pathogen of infectious diseases?

In the figure shown,the velocities of different blocks are given. The velocity of $C$ is $.........\,m/s$.

An electrochemical cell is fueled by the combustion of butane at $1$ bar and $298 K$ . Its cell potential is $\frac{ X }{ F } \times 10^3$ volts, where $F$ is the Faraday constant. The value of $X$ is $...$ .
Use : Standard Gibbs energies of formation at $298 K$ are : $\Delta_f G_{ CO _2}^{ o }=-394 kJ mol ^{-1}; \Delta_f G_{\text {water }}^{ o }=-237 kJ mol ^{-1} ; \Delta_f G_{\text {butane }}^{ o }=-18 kJ mol ^{-1}$

Which of the following is a redox reaction?

In $NaCl$ the centres of two nearest like-charged ions are present at a distance of