For a concentrated solution of a weak electrolyte ($$K_{eq}$$ = equilibrium constant) A$$_2$$B$$_3$$ of concentration 'C', the degree of dissociation '$$\alpha$$' is
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For a concentrated solution of a weak electrolyte ($$K_{eq}$$ = equilibrium constant) A$$_2$$B$$_3$$ of concentration 'C', the degree of dissociation '$$\alpha$$' is
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Which of the following options are correct for the reaction?
$$2Au(CN)_2 ^-(aq) + Zn(s) \rightarrow 2Au(s) + Zn(CN)_4 ^{2-}(aq)$$
A. Redox reaction
B. Displacement reaction
C. Decomposition reaction
D. Combination reaction
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Strong reducing and oxidizing agents among the following, respectively, are
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Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Loss of electron from hydrogen atom results in nucleus of ~$$1.5 \times 10^{-3}$$ pm size.
Reason R: Proton H$$^+$$ always exists in combined form.
In the light of the above statements, choose the most appropriate answer from the options given below:
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The setting time of Cement is increased by adding
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Match List-I with List-II.
List-I (Element detected) List-II (Reagent used/Product formed)
A. Nitrogen I. Na$$_2$$FeCN$$_5$$NO
B. Sulphur II. AgNO$$_3$$
C. Phosphorus III. Fe$$_4$$FeCN$$_{6_{3}}$$
D. Halogen IV. NH$$_{4_{2}}$$MoO$$_4$$
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The possibility of photochemical smog formation is more at
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A compound is formed by two elements X and Y. The element Y forms cubic close packed arrangement and those of element X occupy one third of the tetrahedral voids. What is the formula of the compound?
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The standard electrode potential of M$$^+$$/M in aqueous solution does not depend on
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Match List I with List II
LIST I - Enzymatic reaction LIST II - Enzyme
A. Sucrose $$\rightarrow$$ Glucose and Fructose I. Zymase
B. Glucose $$\rightarrow$$ ethyl alcohol and CO$$_2$$ II. Pepsin
C. Starch $$\rightarrow$$ Maltose III. Invertase
D. Proteins $$\rightarrow$$ Amino acids IV. Diastase
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The difference between electron gain enthalpies will be maximum between:
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Match List I with List II
List I (Oxide) List II (Type of bond)
A. N$$_2$$O$$_4$$ I. 1 N=O bond
B. NO$$_2$$ II. 1 N-O-N bond
C. N$$_2$$O$$_5$$ III. 1 N-N bond
D. N$$_2$$O IV. 1 N=N/N$$\equiv$$N bond
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Match List-I with List-II.
List-I (Name of reaction) List-II (Reagent used)
A. Hell-Volhard Zelinsky reaction I. NaOH + I$$_2$$
B. Iodoform reaction II. (i) CrO$$_2$$Cl$$_2$$, CS$$_2$$ (ii) H$$_2$$O
C. Etard reaction III. (i) Br$$_2$$/red phosphorus (ii) H$$_2$$O
D. Gatterman-Koch reaction IV. CO, HCl, anhyd. AlCl$$_3$$
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Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The spin only magnetic moment value for Fe(CN)$$_6^{3-}$$ is 1.74 BM, whereas for [Fe(H$$_2$$O)$$_6$$]$$^{3+}$$ is 5.92 BM.
Reason B: In both complexes, Fe is present in +3 oxidation state.
In the light of the above statements, choose the correct answer from the options given below:
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For the reaction
The correct statement is
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The major products A and B from the following reactions are:
(1)
(2)
(3)
(4)
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The major product formed in the following reaction is
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Compound P is neutral, Q gives effervescence with NaHCO$$_3$$ while R reacts with Hinsberg's reagent to give solid soluble in NaOH. Compound P is
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Polymer used in orlon is:
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Match List I and List II
List I (Vitamin) List II (Deficiency disease)
A. Vitamin A I. Beri-Beri
B. Thiamine II. Cheilosis
C. Ascorbic acid III. Xerophthalmia
D. Riboflavin IV. Scurvy
Choose the correct answer from the options given below
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If 5 moles of BaCl$$_2$$ is mixed with 2 moles of Na$$_3$$PO$$_4$$, the maximum number of moles of Ba$$_3$$(PO$$_4$$)$$_2$$ formed is ______ (Nearest integer)
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The wavelength of an electron of kinetic energy $$4.50 \times 10^{-29}$$ J is ______ $$\times 10{-5}$$ m. (Nearest integer)
Given: mass of electron is $$9 \times 10{-31}$$ kg, h = $$6.6 \times 10{-34}$$ Js
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The number of species from the following which have square pyramidal structure is ______
PF$$_5$$, BrF$$_4^-$$, IF$$_5$$, BrF$$_5$$, XeOF$$_4$$, ICl$$_4^-$$
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The value of log K for the reaction A $$\rightleftharpoons$$ B at 298 K is ______. (Nearest integer)
Given: $$\Delta H° = -54.07$$ kJ mol$$^{-1}$$, $$\Delta S° = 10$$ J K$$^{-1}$$ mol$$^{-1}$$
(Taken $$2.303 \times 8.314 \times 298 = 5705$$)
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Consider the graph of Gibbs free energy G vs extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is ______
A. Reaction is spontaneous at (a) and (b)
B. Reaction is at equilibrium at point (b) and non-spontaneous at point (c)
C. Reaction is spontaneous at (a) and non-spontaneous at (c)
D. Reaction is non-spontaneous at (a) and (b)
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Number of bromo derivatives obtained on treating ethane with excess of Br$$_2$$ in diffused sunlight is ______
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Mass of Urea NH$$_2$$CONH$$_2$$ required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is ______ g. (Nearest integer)
Given: Molar mass of N, C, O and H are 14, 12, 16 and 1 g mol$$^{-1}$$ respectively.
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For the adsorption of hydrogen on platinum, the activation energy is 30 kJ mol$$^{-1}$$ and for the adsorption of hydrogen on nickel, the activation energy is 41.4 kJ mol$$^{-1}$$. The logarithm of the ratio of the rates of chemisorption on equal areas of the metals at 300 K is ______ (Nearest integer)
Given: ln10 = 2.3, R = 8.3 J K$$^{-1}$$ mol$$^{-1}$$
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In ammonium-phosphomolybdate, the oxidation state of Mo is +______
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Number of ambidentate ligands in a representative metal complex M(en)(SCN)$$_4$$ is ______. [en = ethylenediamine]
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