Molarity of 4 % NaOH solution is ......... M.

Acidified $K _2 Cr _2 O _7$, alkaline $KMnO _4, CuSO _4, H _2 O _2, Cl _2, O _3, FeCl _3, HNO _3$ and $Na _2 S _2 O _3$. The total number of reagents that can oxidise aqueous iodide to iodine is

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The expression for Bohr's radius of an atom is

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In a cell, the following reactions take place

$Fe ^{2+} \rightarrow Fe ^{3+} + e ^{-} \quad E _{ Fe ^{3+} / Fe ^{2+}}=0.77 \,V$

$2 I ^{-} \rightarrow I _{2}+2 e ^{-} \quad E _{ I _{2} / I ^{-}}^{0}=0.54 \,V$

The standard electrode potential for the spontaneous reaction in the cell is $x \times 10^{-2} \,V 298$ $K$. The value of $x$ is .... (Nearest Integer)

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Resonance structure of molecule does not have

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Identify the incorrect statement for $PCl _{5}$ from the following.

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The number of structural isomers possible from the molecular formula $C_3H_9N$ is

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${K_4}[Fe{(CN)_6}] + \,{M^{x + }}(aq.) \to \mathop {{M_4}{{[Fe{{(CN)}_6}]}_x}}\limits_{Coloured\,\,precipirate} \, \downarrow $

Which of the following cation does not respond to the above reaction ?

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The vapour pressures of pure liquids $A$ and $B$ are $400$ and $600\, mm\, Hg$, respectively at $298\, K$. On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid $B$ is $0.5$ in the mixture. The vapour pressure of the final solution, the mole fractions of components $A$ and $B$ in vapour phase, respectively are

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