Which of the following mixture gives a buffer solution with pH = 9.25 ? Given : pKb (NH4OH) = 4.75
Which of the following mixture gives a buffer solution with pH = 9.25 ? Q. Which of the following mixture […]
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[Ni(PPh3)2Cl2] is a paramagnetic complex. Identify the INCORRECT statements about this complex. A. The complex exhibits geometrical isomerism. B. The complex is white in colour. C. The calculated spin-only magnetic moment of the complex is 2.84 BM. D. The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is −0.8Δo. E. The geometrical arrangement of ligands in this complex is similar to that in Ni(CO)4.
Incorrect statements for Ni(PPh3)2Cl2 paramagnetic complex Q. [Ni(PPh3)2Cl2] is a paramagnetic complex. Identify the INCORRECT statements about this complex. A.
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Correct statements regarding Arrhenius equation among the following are : A. Factor e^(−Ea/RT) corresponds to fraction of molecules having kinetic energy less than Ea. B. At a given temperature, lower the Ea, faster is the reaction. C. Increase in temperature by about 10°C doubles the rate of reaction. D. Plot of log k vs 1/T gives a straight line with slope = −Ea/R. Choose the correct answer from the options given below :
Correct statements regarding Arrhenius equation Q. Correct statements regarding Arrhenius equation among the following are : A. Factor $e^{-E_a/RT}$ corresponds
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Identify the correct statements : A. Hydrated salts can be used as primary standard. B. Primary standard should not undergo any reaction with air. C. Reactions of primary standard with another substance should be instantaneous and stoichiometric. D. Primary standard should not be soluble in water. E. Primary standard should have low relative molar mass.
Identify correct statements for primary standard substances Q. Identify the correct statements : A. Hydrated salts can be used as
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Match List – I with List – II. List – I (Reaction of Glucose with) A. Hydroxylamine B. Br₂ water C. Excess acetic anhydride D. Concentrated HNO₃ List – II (Product formed) I. Gluconic acid II. Glucose pentacetate III. Saccharic acid IV. Glucoxime Choose the correct answer from the options given below :
Match reactions of glucose with products formed Q. Match List – I with List – II. List – I(Reaction of
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The compound A, C8H8O2 reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl alcohol as one of the two products. The compound A is :
The compound C8H8O2 reacts with acetophenone via cross Aldol condensation Q. The compound A, C8H8O2 reacts with acetophenone to form
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Consider the following reduction processes : Al³⁺ + 3e⁻ → Al(s), E° = −1.66 V Fe³⁺ + e⁻ → Fe²⁺, E° = +0.77 V Co³⁺ + e⁻ → Co²⁺, E° = +1.81 V Cr³⁺ + 3e⁻ → Cr(s), E° = −0.74 V The tendency to act as reducing agent decreases in the order :
Reduction potentials and order of reducing strength of elements Q. Consider the following reduction processes : Al3+ + 3e− →
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Given below are two statements : Statement I : C < O < N < F is the correct order in terms of first ionization enthalpy values. Statement II : S > Se > Te > Po > O is the correct order in terms of the magnitude of electron gain enthalpy values. In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements on ionization enthalpy and electron gain enthalpy Q. Given below are two statements : Statement
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Among H₂S, H₂O, NF₃, NH₃ and CHCl₃, identify the molecule (X) with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule (X) is :
Among H₂S, H₂O, NF₃, NH₃ and CHCl₃ identify the molecule with lowest dipole moment Q. Among H2S, H2O, NF3, NH3
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Two masses m and 2 m are connected by a light string going over a pulley (disc) of mass 30 m with radius r = 0.1 m. The pulley is mounted in a vertical plane and it is free to rotate about its axis. The 2 m mass is released from rest and its speed when it has descended through a height of 3.6 m is ____ m/s. (Assume string does not slip and g = 10 m/s²)
Two masses m and 2 m are connected by a light string going over a pulley Q. Two masses $m$