3-hydroxybutanal is formed when \((X)\) reacts with \((Y)\) in dilute \((Z)\) solution. What are \(X, Y\) and \(Z\) ? \(\begin{array}{lll}X & Y & Y\end{array}\)

Which of the following does not form a buffer solution?

Observe the following statements
Statement - I: \(\quad\) Both LiF and CsI have low solubility in water
Statement - II: \(\quad\) Low solubility of LiF in water is due to smaller hydration enthalpy of ions and that of CsI is due to its high lattice enthalpy
The correct answer is

Two liquids ' \(A\) ' and ' \(B\) ' form an ideal solution. At 300 K, the vapour pressure of a solution containing 1 mole of ' \(A\) ' and 3 moles of ' \(B\) ' is 550 mm Hg. At the same temperature, if one more mole of ' B ' is added to the solution, the vapour pressure of solution increases to 560 mm Hg. Then the ratio of vapour pressures of \(A\) and B in their pure state is

\[ \begin{aligned} & \text { Given } \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}(l) ; \Delta \mathrm{H}=-285 \mathrm{~kJ} \ & \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(l) \rightarrow 2 \mathrm{HNO}_3(l) ; \Delta \mathrm{H}=-76.6 \mathrm{~kJ} \ & \mathrm{~N}_2(\mathrm{~g})+3 \mathrm{O}_2(\mathrm{~g})+\mathrm{H}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HNO}_3(l) ; \Delta \mathrm{H}=-348.2 \mathrm{~kJ} \ & \text { Calculate the } \Delta \mathrm{H} \text { of } 2 \mathrm{~N}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \end{aligned} \] Calculate the \(\Delta \mathrm{H}\) of \(2 \mathrm{~N}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g})\).

Identify the pair of species having same energy from the following (The number given in the bracket corresponds to principal quantum number ( \(n\) ) in which the electron is present)

Combustion of \(10 \mathrm{ml}\) of a gaseous hydrocarbon gives \(40 \mathrm{ml}\) of \(\mathrm{CO}_2\) and \(50 \mathrm{ml}\) of water vapour under the same conditions. The molecular formula of the hydrocarbon is

If \(A(2,3)\) and \(B(3,-2)\) are two fixed points and \(P(x, y)\) is a variable point satisfying the condition \(|P A-P B|=2\), then the locus of \(P\) is

If \(f(x)=3 x^{15}-5 x^{10}+7 x^5+50 \cos (x-1)\), then \(\lim _{h \rightarrow 0} \frac{f(1-h)-f(1)}{h^3+3 h}=\)

If $2+2\sqrt{3}i=k(\cos \theta +i\sin \theta ), (k>0),$ then $\frac{1}{\sqrt{3}}[\cos 6\theta +i\sin 6\theta ]=$

A straight line passing through a fixed point $\left(3, 5\right)$ intersects the coordinate axes at two points $A$ and $B.$ If the locus of $\mathrm{C}\left(x, y\right)$ which forms a rectangle with the points $A, O$ (origin) and $B$ is $ax+2hxy+by=0$ then $a+b+h=$

The roots of the equation \(x^3-14 x^2+56 x-64=0\) are in

Helium mixed with oxygen is used in the treatment of