The basic structural unit of feldspar, zeolites, mica and asbestos is

Number of compounds giving \((i)\) red colouration with ceric ammonium nitrate and also \((ii)\) positive iodoform test from the following is \(...........\).

\(A _2+ B _2 \rightarrow 2 AB \cdot \Delta H _{ l }^0=-200\,kJmol ^{-1}\) \(AB , A _2\) 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)

For the following reactions \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{Z}^{-}\)\(\xrightarrow[{{\text{Sublimation}}}]{{{k_s}}} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Z}+\mathrm{Br}^{-}\) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{Z}^{-}\)\(\xrightarrow[{{\text{elimination}}}]{{{k_e}}}\mathrm{CH}_{3} \mathrm{CH}= \mathrm{CH}_{2} +\mathrm{HZ}+\mathrm{Br}^{-}\) where  \(\mathrm{Z}^{-}=\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{O}^{-}(\mathrm{A})\) or \(\begin{array}{*{20}{c}}
  {\,C{H_3}} \\ 
  {|\,\,\,\,\,} \\ 
  {C{H_3} - C - {O^ - }(B)} \\ 
  {|\,\,\,\,} \\ 
  {\,\,C{H_3}} 
\end{array}\) \(\mathrm{k}_{\mathrm{s}}\) and \(\mathrm{k}_{\mathrm{e}},\) are \(,\) respectively, the rate constants for the substitution and elimination, and \(\mu=\frac{\mathrm{k}_{\mathrm{s}}}{\mathrm{k}_{\mathrm{e}}},\) the correct options is

The reaction \(2 NO + Br _2 \rightarrow 2 NOBr\) takes places through the mechanism given below : \(NO + Br _2 \Leftrightarrow NOBr _2 \text { (fast) }\) \(NOBr _2+ NO \rightarrow 2 NOBr \text { (slow) }\) The overall order of the reaction is \(.....\).

\(500\) mL of \(0.2\) M MnO\(_4^-\) solution in basic medium when mixed with \(500\) mL of \(1.5\) M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard \(x\) M thiosulphate solution in presence of starch till the end point. If \(300\) mL of thiosulphate was consumed, then the value of \(x\) is __________.

Number of metal ions characterized by flame test among the following is _______.
\(Sr ^{2+}, Ba ^{2+}, Ca ^{2+}, Cu ^{2+}, Zn ^{2+}, Co ^{2+}, Fe ^{2+}\)

Three moles of \(\mathrm{AgCl}\) get precipitated when one mole of an octahedral co-ordination compound with empirical formula \(\mathrm{CrCl}_{3} \cdot 3 \mathrm{NH}_{3} \cdot 3 \mathrm{H}_{2} \mathrm{O}\) reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is \(......\)

Among the following species
\(N _{2}, N _{2}^{+}, N _{2}^{-}, N _{2}{ }^{2-}, O _{2}, O _{2}{ }^{+}, O _{2}^{-}, O _{2}{ }^{2-}\) the number of species showing diamagnetism is.

Fuel cell, using hydrogen and oxygen as fuels, \(A\). has been used in spaceship \(B\). has as efficiency of \(40 \%\) to produce electricity \(C\). uses aluminium as catalysts \(D\). is eco-friendly \(E\). is actually a type of Galvanic cell only

In a transverse wave the distance between a crest and neighbouring trough at the same instant is \(4.0\, cm\) and the distance between a crest and trough at the same place is \(1 .0\, cm\) . The next crest appears at the same place after a time interval of \(0.4\,s\). The maximum speed of the vibrating particles in the medium is

The acceleration due to gravity on the earth's surface at the poles is \(g\) and angular velocity of the earth about the axis passing through the pole is \(\omega .\) An object is weighed at the equator and at a height \(h\) above the poles by using a spring balance. If the weights are found to be same, then \(h\) is \(:( h << R ,\) where \(R\) is the radius of the earth)

A cubical block of side \(30\,cm\)  is moving with  velocity \(2\,\,ms^{-1}\) on a smooth horizontal surface. The surface has a bump at a point \(O\) as shown in figure. The angular velocity (in rad/s) of the block immediately after it hits the bump, is