Geometry of \(\mathrm{SiO}_{4}^{4-}\) anion is

Find the number of water molecules in 1 mL of water vapours at STP?

Which of the following compounds is amphoteric in nature?

What is the number of electrons present in 3 d orbital of Ti in +2 state?

What is the number of moles of Cl atoms and N atoms respectively present in n moles of tear gas?

Which of the following processes exhibits increase in internal energy?

Identify the element having smallest atomic radius from following

Calculate the standard enthalpy change for reaction,
\(\begin{aligned}
& \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}_{(\ell)}+3 \mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}+3 \mathrm{H}_2 \mathrm{O}_{(\ell)} \\
& \text {If,}\\
& \text {} \begin{aligned}
\Delta_{\mathrm{f}} \mathrm{H}^{\circ}\left(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}\right) & =-280 \mathrm{~kJ} \mathrm{~mol}^{-1} \\
\Delta_{\mathrm{f}} \mathrm{H}^{\circ}\left(\mathrm{CO}_2\right) & =-390 \mathrm{~kJ} \mathrm{~mol}^{-1} \\
\Delta_{\mathrm{f}} \mathrm{H}^{\circ}\left(\mathrm{H}_2 \mathrm{O}\right) & =-285 \mathrm{~kJ} \mathrm{~mol}^{-1}
\end{aligned}
\end{aligned}\)

Calculate the number of moles of nonvolatile solute dissolved in 0.3 kg solvent if \(\Delta \mathrm{T}_{\mathrm{b}}=0.3 \mathrm{~K}\) and \(\mathrm{K}_{\mathrm{b}}\) for solvent is \(1.8 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\)

A particle starts from mean position and performs S.H.M. with period 4 second. At what time its kinetic energy is \(50 \%\) of total energy?

If $G\left(3,-5,r\right)$ is centroid of triangle $ABC$ where, $A\left(7,-8,1\right),B\left(p,q,5\right)$ and $C\left(q+1,5p,0\right)$ are vertices of a triangle then values of $p,q,r$ are respectively ________

The instantaneous values of current and voltage in an AC circuit are given by \(I=6 \sin \left(100 \pi t+\frac{\pi}{4}\right)\) and \(V=5 \sin \left(100 \pi t-\frac{\pi}{4}\right)\), then

Which from following compounds is obtained when anisole is heated with dilute sulfuric acid?