The amorphous form of silica is

For reaction

The correct order of set of reagents for the above conversion is _______.

The logarithm of equilibrium constant for the reaction \(Pd ^{2+}+4 Cl ^{-} \rightleftharpoons PdCl _4^{2-}\) is (Nearest integer) Given \(: \frac{2.303 RT }{ F }=0.06 V\) \(Pd _{( aq )}^{2+}+2 e ^{-} \rightleftharpoons Pd ( s ) \quad E ^{\circ}=0.83\,V\) \(PdCl _4^{2-}( aq )+2 e ^{-} \rightleftharpoons Pd ( s )+4 Cl ^{-}( aq )\) \(E ^{\circ}=0.65\,V\)

For the reaction: \(RCH _2 Br + I ^{-} \stackrel{\text { Acetone }}{\longrightarrow} \underset{\text { major }}{ RCH _2 I + Br ^{-}}\) The correct statement is :

Match List \(I\) with List \(II\)

	List \(I\)		List \(II\)
\(A\)	\(\alpha\)-Glucose and \(\alpha\)-Galactose	\(I\)	Functional isomers
\(B\)	\(\alpha\)-Glucose and \(\beta\)-Glucose	\(II\)	Homologous
\(C\)	\(\alpha\)-Glucose and \(\alpha\)-Fructose	\(III\)	Anomers
\(D\)	\(\alpha\)-Glucose and \(\alpha\)-Ribose	\(IV\)	Epimers

Choose the correct answer from the options given below:

\(A _2+ B _2 \rightarrow 2 AB \cdot \Delta H _{ l }^0=-200\,kJmol ^{-1}\) \(AB , A _2\) and \(B _2\) are diatomic molecule. If the bond enthalpies of \(A _2, B _2\) and \(AB\) are in the ratio \(1: 0.5: 1\), then the bond enthalpy of \(A_2\) is \(......\,kJ\,mol ^{-1}\) (Nearest integer)

The sum of oxidation states of two silver ions in \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]\) complex is .... .

The osmotic pressure of a solution of \(NaCl\) is \(0.10\) \(atm\) and that of a glucose solution is \(0.20\) \(atm.\) The osmotic pressure of a solution formed by mixing \(1\, L\) of the sodium chloride solution with \(2\, L\) of the glucose solution is \(x \times 10^{-3}\) atm. \(x\) is.......... (nearest integer)

Which of the following compounds is not colored yellow ?

If the term independent of \(x\) in the exapansion of \(\left(\frac{3}{2} x^{2}-\frac{1}{3 x}\right)^{9}\) is \(k,\) then \(18 k\) is equal to

A bob of mass \(m\) attached to an inextensible string of length \(l\) is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed \(\omega\ rad/s\) about the vertical. About the point of suspension:

The isomeric deuterated bromide with molecular formula \(C _4 H _8 DBr\) having two chiral carbon atoms is

Let \(\quad \overrightarrow{\mathrm{a}}=2 \hat{\mathrm{i}}+\alpha \hat{\mathrm{j}}+\hat{\mathrm{k}}, \quad \overrightarrow{\mathrm{b}}=-\hat{\mathrm{i}}+\hat{\mathrm{k}}, \quad \overrightarrow{\mathrm{c}}=\beta \hat{\mathrm{j}}-\hat{\mathrm{k}}\), where \(\alpha\) and \(\beta\) are integers and \(\alpha \beta=-6\). Let the values of the ordered pair \((\alpha, \beta)\) for which the area of the parallelogram of diagonals \(\vec{a}+\vec{b}\) and \(\vec{b}+\vec{c}\) is \(\frac{\sqrt{21}}{2}\), be \(\left(\alpha_1, \beta_1\right)\) and \(\left(\alpha_2, \beta_2\right)\). Then \(\alpha_1^2+\beta_1^2-\alpha_2 \beta_2\) is equal to