The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is:
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The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is:
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The correct set of four quantum numbers for the valence electrons of rubidium atom ($$Z = 37$$) is:
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Which one of the following properties is not shown by NO?
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For which of the following molecule significant $$\mu \neq 0$$?
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If Z is the compressibility factor, then Van der Waal's equation at low pressure can be written as:
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For complete combustion of ethanol, $$C_2H_5OH(l) + 3O_2(g) \to 2CO_2(g) + 3H_2O(l)$$, the amount of heat produced as measured in bomb calorimeter, is 1364.47 kJ mol$$^{-1}$$ at 25°C. Assuming ideality the Enthalpy of combustion, $$\Delta_cH$$, for the reaction will be: ($$R = 8.314$$ kJ mol$$^{-1}$$)
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For the reaction $$SO_2(g) + \frac{1}{2}O_2(g) \rightleftharpoons SO_3(g)$$, if $$K_P = K_C(RT)^x$$ where the symbols have usual meaning, then the value of x is: (assuming ideality)
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In which of the following reactions $$H_2O_2$$ acts as a reducing agent?
(a) $$H_2O_2 + 2H^+ + 2e^- \to 2H_2O$$
(b) $$H_2O_2 - 2e^- \to O_2 + 2H^+$$
(c) $$H_2O_2 + 2e^- \to 2OH^-$$
(d) $$H_2O_2 + 2OH^- - 2e^- \to O_2 + 2H_2O$$
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For the estimation of nitrogen, 1.4 g of an organic compound was digested by the Kjeldahl method and the evolved ammonia was absorbed in 60 ml of $$\frac{M}{10}$$ sulphuric acid. The unreacted acid required 20 ml of $$\frac{M}{10}$$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:
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Considering the basic strength of amines in an aqueous solution, which one has the smallest pK$$_b$$ value?
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The major organic compound formed by the reaction of 1, 1, 1 - trichloroethane with silver powder is:
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CsCl crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct?
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Consider separate solutions of 0.500 M $$C_2H_5OH$$ (aq), 0.100 M $$Mg_3(PO_4)_2$$ (aq), 0.250 M KBr (aq) and 0.125 M $$Na_3PO_4$$ (aq) at 25 °C. Which statement is true about these solutions, assuming all salts to be strong electrolytes?
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Resistance of 0.2 M solution of an electrolyte is 50 $$\Omega$$. The specific conductance of the solution is 1.4 S m$$^{-1}$$. The resistance of 0.5 M solution of the same electrolyte is 280 $$\Omega$$. The molar conductivity of 0.5 M solution of the electrolyte in S m$$^2$$ mol$$^{-1}$$ is:
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The equivalent conductance of NaCl at concentration C and at infinite dilution are $$\lambda_C$$ and $$\lambda_{\infty}$$, respectively. The correct relationship between $$\lambda_C$$ and $$\lambda_{\infty}$$ is given as: (where the constant B is positive)
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The metal that cannot be obtained by the electrolysis of an aqueous solution of its salt is:
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Given below are the half-cell reactions:
$$Mn^{2+} + 2e^- \to Mn$$; $$E^\circ = -1.18$$ V
$$2(Mn^{3+} + e^- \to Mn^{2+})$$; $$E^\circ = +1.51$$ V
The $$E^\circ$$ for $$3Mn^{2+} \to Mn + 2Mn^{3+}$$ will be:
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For the non-stoichiometry reaction, $$2A + B \to C + D$$, the following kinetic data were obtained in three separate experiments, all at 298 K.
Initial Concentration Initial Concentration Initial rate of formation of C
(A) (B) (mol L$$^{-1}$$ S$$^{-1}$$)
0.1 M 0.1 M $$1.2 \times 10^{-3}$$
0.1 M 0.2 M $$1.2 \times 10^{-3}$$
0.2 M 0.1 M $$2.4 \times 10^{-3}$$
The rate law for the formation of C is:
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Which series of reactions correctly represents the chemical relations related to iron and its compound?
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Among the following oxoacids, the correct decreasing order of acid strength is:
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The equation which is balanced and represents the correct product(s) is:
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The octahedral complex of a metal ion $$M^{3+}$$ with four monodentate ligands $$L_1$$, $$L_2$$, $$L_3$$ and $$L_4$$ absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is:
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The correct statement for the molecule CsI$$_3$$, is:
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In S$$_N$$2 reactions, the correct order of reactivity for the following compounds: CH$$_3$$Cl, CH$$_3$$CH$$_2$$Cl, (CH$$_3$$)$$_2$$CHCl and (CH$$_3$$)$$_3$$CCl is:
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The most suitable reagent for the conversion of $$R - CH_2 - OH \to R - CHO$$ is:
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What is the product "C" after following reactions:
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In the reaction, $$CH_3COOH \xrightarrow{LiAlH_4} A \xrightarrow{PCl_5} B \xrightarrow{\text{Alc. KOH}} C$$, the product C is:
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On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is:
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Which among the following is classified as a condensation polymer?
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Which one of the following bases is not present in DNA?
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