What is the decreasing order of field strength of given ligands?
(A) S^2-
(B) Ethylenediamine
(C) NCS^-
(D) CN^-
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The following statements describe various properties of a Mercury cell :
(A) It converts energy of combustion into electrical energy
(B) It is rechargeable
(C) The cell reaction involved is Zn(Hg) + HgO(s) \(\rightarrow\) ZnO(s) + Hg(l)
(D) It is a low current device used in hearing aids
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Nearly all the transition elements display typical metallic properties such as high tensile strength, ductility, malleability, high thermal and electrical conductivity and metallic lustre. The transition metals (with the exception of Zn, Cd and Hg) are very hard and have low volatility. Their melting and boiling points are high. They have high enthalpies of atomization. lons of the same charge in a given series show progressive decrease in radius with increasing atomic number. However, the variation within a series is quite small. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction which essentially compensates for the expected increase in atomic size with increasing atomic number. The net result of the lanthanoid contraction is that the second and the third d series exhibit similar radii (e.g., Zr 160 pm, Hf 159 pm) and have very similar physical and chemical properties. There is an increase in ionisation enthalpy along each series of the transition elements from left to right. The first ionisation enthalpy, in general, increases, but the magnitude of the increase in the second and third ionisation enthalpies for the successive elements, is much higher along a series. One of the notable features of a transition elements is the great variety of oxidation states these may show in their compounds.
Atomic number of Fe, Co, Ni and Cu are 26, 27, 28 and 29 respectively. Which among them is expected to possess the highest value for the second ionization enthalpy?

The reagent involved in Lucas test is

The rate constant of a reaction increases from \(0.02 \mathrm{~s}^{-1}\) to \(0.04 \mathrm{~s}^{-1}\) when the temperature is raised from 500 K to 600 K.
The activation energy \(\left(E_a\right)\) of the reaction is
(Given: \(\log _{10} 2=0.3010\) )

Which cell is rechargeable?

Answer the question on the basis of passage given below :
Adsorption is a surface phenomenon which can be expressed by means of an empirical relationship know as Freundlich Adsorption isotherm. The relationship given by \(\frac{x}{m} = Kp^{\frac{1}{n}}\ (n > 1)\)
x = Mass of the gas adsorbed
m = Mass of adsorbent
p = Pressure at which adsorption takes place
K and n are constant
Which electrolyte/electrolytes can coagulate a ferric hydroxide sol most effectively?
A. \(K _3\left[ Fe ( CN )_6\right]\)
B. \(Na _3 PO _4\)
C. \(Na _2 SO _4\)
D. \(KNO _2\)
E. KI
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\(C_2 H_5 OH \xrightarrow{X} C_2 H_5 Cl \xrightarrow{Y} C_2 H_5 CN\)
\(X\) and \(Y\) used in the above reaction are :

Consider the function \(f(x)=x^3-3 x\). Then Match List-I with List-II:

List-I	List-II
(A) Point of local Maxima	(I) 1
(B) Point of local Minima	(II) -1
(C) Local maximum value	(III) 2
(D) Local minimum value	(IV) - 2

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Read the passage carefully and answer the Questions
Molar conductivity \(\left(\Lambda_m\right)\) of a solution at a given concentration (c) is the conductance of volume, V of solution, containing one mole of electrolyte kept between the two electrodes with area of cross-section A and at a distance of unit length. It increases with the decrease in concentration and when the concentration approaches zero, the molar conductivity is called limiting molar
conductivity \(\left(\Lambda_m^0\right)\). For a strong electrolyte, \(\Lambda_m\) increases linearly with dilution and is given by \(\Lambda_m=\Lambda_m^0-A c^{1 / 2}\). The value of the constant A for a given solvent depends on the type of electrolyte along with temperature. According to Kohlrausch law, the value of \(\Lambda_m^0\) for an electrolyte is \(\Lambda_m^0=\nu_{+} \lambda_{+}^0+\nu_{-} \lambda_{-}^0\), where \(\nu_{+}\)and \(\nu_{-}\) are the number of cations and anions, respectively, per molecule of the electrolyte and \(\lambda_{+}^0\) and \(\lambda_{-}^0\) are limiting molar conductivities of cation and anion, respectively. Kohlrausch law finds many applications, like determining the solubility of a sparingly soluble salt, determining the degree of dissociation \(\left(\Lambda_m / \Lambda_m^0\right)\), and the dissociation constant of a weak electrolyte.
The plot between \(\Lambda_m\) and \(c^{1 / 2}\) is a straight line with

The area enclosed between the graph of \(y=x^3\) and the lines \(x=0, y=1, y=8\) is

If \(C(x)=x^3-5 / 2 x^2+10\) represents the total cost of producing \(x\) units by a car manufacturing company. The slope of the marginal cost curve at \(x = 3\), will be:

What is the correct sequence of increasing reactivity of the following compounds towards nucleophilic addition reaction?
(A) Ethanal
(B) Propanone
(C) Propanal
(D) Butanone
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