Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ______. B, C, N, S, O, F, P, Al, Si
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Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ______. B, C, N, S, O, F, P, Al, Si
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The correct order of first ionization enthalpy values of the following elements is: (A) O (B) N (C) Be (D) F (E) B. Choose the correct answer from the options given below :
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Which one of the following molecules has maximum dipole moment?
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Number of molecules/ions from the following in which the central atom is involved in sp³ hybridization is: $$NO_3^-,\ BCl_3,\ ClO_2^-,\ ClO_3$$
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Match List I with List II :
Choose the correct answer from the options given below :
Which of the following nitrogen containing compound does not give Lassaigne's test?
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Which among the following is incorrect statement?
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Identify (B) and (C) and how are (A) and (C) related ?
The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is: (Given: Molar Mass Na: 23 and Cl: 35.5 g mol⁻¹)
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What pressure (bar) of H₂ would be required to make emf of hydrogen electrode zero in pure water at 25°C?
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One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?
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What will be the decreasing order of basic strength of the following conjugate bases? $$^-OH,\ R\bar{O},\ CH_3CO\bar{O},\ C\bar{l}$$
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The element which shows only one oxidation state other than its elemental form is:
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Number of complexes from the following with even number of unpaired "d" electrons is: $$[V(H_2O)_6]^{3+}$$, $$\ [Cr(H_2O)_6]^{2+}$$, $$\ [Fe(H_2O)_6]^{3+}$$, $$\ [Ni(H_2O)_6]^{3+}$$, $$\ [Cu(H_2O)_6]^{2+}$$. [Given atomic numbers: V=23, Cr=24, Fe=26, Ni=28, Cu=29]
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The correct sequence of ligands in the order of decreasing field strength is:
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Identify the correct set of reagents or reaction conditions 'X' and 'Y' in the following set of transformation:
Given below are two statements: Statement I: Acidity of α-hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II: Reaction between benzaldehyde and ethanal will NOT give Cross-Aldol product. Choose the most appropriate answer from the options given below :
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Identify the product in the following reaction :
In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to:
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Which of the following is the correct structure of L-Glucose? (Four Fischer projection structures shown)
The de-Broglie's wavelength of an electron in the 4th orbit is ______ $$\pi a_0$$. ($$a_0$$ = Bohr's radius)
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Number of molecules/species from the following having one unpaired electron is ______. $$O_2,\ O_2^{-1},\ NO,\ CN^{-1},\ O_2^{2-}$$
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The enthalpy of formation of ethane (C₂H₆) from ethylene by addition of hydrogen where the bond-energies of C−H, C−C, C=C, H−H are 414 kJ, 347 kJ, 615 kJ and 435 kJ respectively is ______ kJ.
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Only 2 mL of KMnO₄ solution of unknown molarity is required to reach the end point of a titration of 20 mL of oxalic acid (2M) in acidic medium. The molarity of KMnO₄ solution should be ______ M.
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The number of different chain isomers for C₇H₁₆ is ______.
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2.5 g of a non-volatile, non-electrolyte is dissolved in 100 g of water at 25°C. The solution showed a boiling point elevation by 2°C. Assuming the solute concentration is negligible with respect to the solvent concentration, the vapor pressure of the resulting aqueous solution is ______ mm of Hg (nearest integer). [Given: Kb = 0.52 K·kgmol⁻¹, 1 atm = 760 mm Hg, molar mass of water = 18 g mol⁻¹]
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Consider the following transformation involving first order elementary reaction in each step at constant
temperature as shown below.
Some details of the above reactions are listed below.
Consider the following reaction: $$MnO_2 + KOH + O_2 \to A + H_2O$$. Product A in neutral or acidic medium disproportionates to give products B and C along with water. The sum of spin-only magnetic moment values of B and C is ______ BM. (nearest integer) [Given atomic number of Mn is 25]
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The number of the correct reaction(s) among the following is ______
X g of ethylamine is subjected to reaction with NaNO₂/HCl followed by water; evolved dinitrogen gas which occupied 2.24 L volume at STP. X is ______ × 10⁻¹ g.
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