The correct order of total number of atoms in: (A) 2 moles of cyclohexane, (B) 684 g of sucrose, (C) 90.8 L of dihydrogen at STP, is :
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The correct order of total number of atoms in: (A) 2 moles of cyclohexane, (B) 684 g of sucrose, (C) 90.8 L of dihydrogen at STP, is :
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The species having identical radii according to the Bohr's theory are:
A. H (first orbit)
B. He$$^+$$ (first orbit)
C. He$$^+$$ (Second orbit)
D. Li$$^{2+}$$ (first orbit)
E. Be$$^{3+}$$ (Second orbit)
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Which of the following pictorial diagram most correctly represents the $$\pi^*$$ ($$\pi$$ - antibonding) molecular orbital between two atoms if the internuclear axis is taken to be in the z-direction $$(\xrightarrow{z-axis})$$?
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At 27 °C, 0.1 M, 1 L K$$_4$$[Fe(CN)$$_6$$] aqueous solution and 0.1 M, 1 L FeCl$$_3$$ aqueous solution are placed in a container separated by a semi permeable membrane AB. Assume complete dissociation of both the solutes. Which of the following statement is correct?
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20 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization. A solution (X) was prepared by mixing 20 mL of the above acetic acid and 14.2 mL of 0.1 M NaOH solution. What is the pH of the solution (X)? (pK$$_a$$ value of acetic acid is 4.75).
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Match the List I with List II:
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The 1$$^{st}$$ ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2$$^{nd}$$ ionization enthalpy of Mg is ______.
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The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about E$$^{3+}$$ are
A. It can act as a reducing agent.
B. It can act as an oxidizing agent.
C. E$$^{3+}$$ is more stable than E$$^+$$.
D. The standard electrode potential value for E$$^{3+}$$/E is positive.
choose the correct answer from the options given below
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Pairs of elements with the same number of electrons in their respective 4f orbital are
[Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72]
A. (Eu and Gd)
B. (Dy and Ho)
C. (Yb and Hf)
D. (Lu and Tm)
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Consider the metal complexes $$[Ni(en)_3]^{2+}$$ (A), $$[NiCl_4]^{2-}$$ (B) and $$[Ni(NH_3)_6]^{2+}$$ (C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption
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Consider the following molecules/species:
The correct order of carbon-oxygen double bond length is:
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Consider $$|x|$$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with $$|x|$$ number of unpaired electrons from the following are:
A. Sc$$^{3+}$$
B. Zn$$^{2+}$$
C. V$$^{2+}$$
D. Fe$$^{2+}$$
E. Co$$^{2+}$$
choose the correct answer from the options given below :
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Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct?
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Compound (X) is subjected to the sequence of reactions as shown above:
Molar mass of the major product (Y) formed is ______ g mol$$^{-1}$$.
(Given molar mass in g mol$$^{-1}$$ C:12, H: 1, O: 16)
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The following structures are
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The descending order of acidity among the following compounds is:
choose the correct answer from the options given below:
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The strongest conjugate acid will result from:
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A D-aldotetrose on oxidation with concentrated HNO$$_3$$ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:
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Among Fe$$^{3+}$$, Pb$$^{2+}$$, Cu$$^{2+}$$ and Mn$$^{2+}$$, identify the one that gets precipitated out while passing H$$_2$$S in presence of NH$$_4$$OH as group reagent. The highest possible oxidation state of the corresponding metal is
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Match the List I with List II:
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If 3.365 g of ethanol (l) is burnt completely in a bomb calorimeter at 298.15 K, the heat produced is 99.472 kJ. The $$|\Delta H_f°|$$ of ethanol at 298.15 K is _________ $$\times 10^2$$ kJ mol$$^{-1}$$. (Nearest integer)
Given: Standard enthalpy for combustion of graphite = $$-393.5$$ kJ mol$$^{-1}$$
Standard enthalpy of formation of water (l) = $$-285.8$$ kJ mol$$^{-1}$$
Molar mass in g mol$$^{-1}$$ of C, H, O are 12, 1 and 16 respectively
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For the following reaction at 50 °C and at 2 atm pressure,
$$2N_2O_5(g) \rightleftharpoons 2N_2O_4(g) + O_2(g)$$
N$$_2$$O$$_5$$ is 50% dissociated.
The magnitude of standard free energy change at this temperature is $$x$$.
$$x$$ = _________ J mol$$^{-1}$$ [Nearest integer].
Given: $$R = 8.314$$ J mol$$^{-1}$$ K$$^{-1}$$, $$\log 2 = 0.30$$, $$\log 3 = 0.48$$, $$\ln 10 = 2.303$$, °C + 273 = K
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An electrochemical cell, consist of the following two redox couples, M$$^{x+}$$(aq)/M(s) [$$E_{red}^{\Theta} = +0.15$$ V] and Fe$$^{3+}$$(aq)/Fe(s) [$$E_{red}^{\Theta} = -0.036$$ V]. The cell EMF (E$$_{cell}$$) is recorded to be 0.2057 V. If the reaction quotient of the electrochemical reaction is found to be $$10^{-2}$$, then the value of $$x$$ is __________. (Nearest integer)
[Given: M is a p-block metal and $$\frac{2.303RT}{F} = 0.059$$ V]
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For a first order reaction A $$\to$$ B
$$x$$ = _________ min. (Nearest integer)
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In sulphur estimation, $$2.0 \times 10^{-3}$$ mol of an organic compound (X) (molar mass 76 g mol$$^{-1}$$) gave 0.4813 g of barium sulphate (molar mass 233 g mol$$^{-1}$$). The percentage of sulphur in the compound (X) is _________ $$\times 10^{-1}$$ % (Nearest integer)
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