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leaching of gold or silver involves a disproportionation reaction justify

I have exam today. Please explain.....

Greater the viscosity,

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°Care 440mmHg for pentane and 120mm Hg for hexane. The mole fraction of pentane in the vapour phase would be:

Total number of voids in $0.45mol$ of a compound forming a hexagonal close packed structure is:

Critical Micelle concentration for a soap solution is $1.5\times {10}^{-4}mol{L}^{-1}.$ Micelle formation is possible only when the concentration of soap solution in $mol{L}^{-1}$ is

The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is :

(A)(B)(C)

(D)

Describe
a method for the identification of primary, secondary and tertiary
amines. Also write chemical equations of the reactions involved.

600ml of ozonised oxygen weighs 1g at NTP. What is the volume composition of ozone and oxygen in the mixture

Shape of $C{O}_2$ & $Si{O}_2$ respectively are

When $C{l}_2$ gas is passed through hot and conc. solution of KOH, following compound is formed

Find the wavelength of the limiting line in the Lyman series of the hydrogen spectrum? $(R=1.097\times {10}^{-2}{\text{nm}}^{-1})$

At 700 K, the equilibrium constant $K_p,$ for the reaction

$2S{O}_3\left(g\right)\rightleftharpoons 2S{O}_2\left(g\right)+O_2\left(g\right)$

is $1.8\times {10}^{-3}kPa.$ What is the numerical value of $K_C$ for this reaction at the same temperature?

$R=0.0821Latmmo{l}^{-1}{K}^{-1}$

Correct option for the position of $Al$ in periodic table is:

The orbital diagram in which the aufbau principle is not violated:

Which sentence is grammatically correct?

The graph of compressibility factor $\left(Z\right)vsP$ for one mole of a real gas is shown in following diagram. The graph is plotted at a constant temperature $273K$. If the slope of graph at very high pressure $\left(\frac{dZ}{dP}\right)$ is $\left(\frac{1}{2.8}\right)at{m}^{-1}$, then the volume of one mole of real gas molecules is: $\left(inL/mol\right)$ $(Given,N_A=6\times {10}^{23}$ and $R=\frac{22.4}{273}Latm{K}^{-1}mo{l}^{-1})$

Which of the following equations represent the standard heat of formation of $C_2{H}_4$?

State the hybrid orbitals associated with B in $BC{l}_3$ and C in $C_2{H}_4$

The equivalent weight of copper and silver are 32 and 108 respectively. When copper and silver voltameter are connected in series and electric current is passed through for sometimes, $1.6g$ of copper is deposited. Then, the mass of silver deposited will be:

In solid $AB,B^{-}$ forms the fcc lattice and $A^{+}$ occupies all the octahedral voids. If atoms from the edge centers along an axis connecting the opposite edge centers on a same face are removed, what will be the empirical formula of the compound?

1. 0.8141

Using IUPAC norms write the formulas for the following:

(i) Tetrahydroxozincate(II)

(ii) Potassium tetrachloridopalladate(II)

(iii) Diamminedichloridoplatinum(II)

(iv) Potassium tetracyanonickelate(II)

(v) Pentaamminenitrito-O-cobalt(III)

(vi) Hexaamminecobalt(III) sulphate

(vii) Potassium tri(oxalato)chromate(III)

(viii) Hexaammineplatinum(IV)

(ix) Tetrabromidocuprate(II)

(x) Pentaamminenitrito-N-cobalt(III)

The number of molecules in $1{\text{cm}}^3$ of an ideal gas at $0^{\circ }$C and at a pressure of ${10}^{–5}\text{mm}$ of mercury is –

(Given that $760\text{mm}$ of mercury column measures $1\text{atm}$)

A valid Lewis structure cannot be drawn for which of the following compounds?

What are
the different types of RNA found in the cell?

The change of angular momentum for an electrons during electronic excitation between any two successive orbits in hydrogen atom is