Favorable sites for protonation in following compound is/are:
The coordination number of Th in K4[Th (Ox)4(OH)2] is:
Most animal cells have
The standard electrode potential E° and its temperature coefficient (dE/dT)P for a cell are 2V and –5 × 10–4 VK–1 at 300 K respectively. The cell emf would be?
Zn(s) + Cu2+ (aq) → Zn+2 (aq.) + Cu(s)
The suitable reagent for the following conversion is:
What would be the correct order of PI values for given amino acids?
(1) Lysine (2) Aspartic acid (3) Valine
Correct order of reactivity of following compounds in Dies-Alder reaction would be?
Benzoic acid (C6H5COOH) dimerizes in benzene. 'W' g of acids dissolved in 30 g of benzene shows a depression in freezing point equal to 2K. If the percentage association of the acid to form dimer is 80, then,numerical value of ‘W’ is [Kf = 5 Kg mol–1, Molar Mass = 122 mol–1]:
A matrix is called orthogonal if it satisfies:
Correct formula of chromite is (It is an oxide mineral belonging to the spinel group):
The correct form of moment of inertia of CO2 molecules is:
The reaction, MgO(s) + C(s) → Mg(s) + CO(g) for which ΔrHº=491.1KJ/mol-1and ΔrSº=198.0 KJ/mol-1is not feasible at 298 K. Temperature above which reaction will be feasible is?
Calculate the projection around z-axis forl = 2 and ml = 2:
The bond angle between two hybrid orbitals is 105°. The percentage s-character of hybrid orbital is between:
When S in the form of S8 is heated at 900 K, the initial pressure of 1 atm falls by 29% at equilibrium. This is because of conversion of S8 to S2. Find the value of equilibrium constant of this reaction.
0.2 M NaOH is titrated with 0.2 M, 20 ml, HA (Monobasic acid) till the equivalence point reached degree of dissociation of HA is supposed to be legible. Calculate the pH of the resulting solution at the end point. [Given Ka = 1.8 × 10–5]
The compound formed is/are in the positive test for nitrogen with the Lassaigne extract of an organic compound:
Determine enthalpy change (in kJ) for C3H8(g) +H2 (g) →C2H6(g)+CH4(g) at 25°C using heat of combustion value under standard conditions. Given: ΔHformC3H8(g) = –103.8 kJ/mole.
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se, and Ar?
The reaction between [PdCl4]2– and C2H4 produces a new compound. Compared to free C2H4, the C—C bond order of the product is:
Consider the following chemical reaction and choose the correct product:
Consider the following chemical reaction and choose the correct alternative:
; Final product is:
Consider the following chemical reaction and choose major product:
A ketone on treatment with bromine in methanol gives the corresponding Monobromo compound [X] having molecular formula C5H9BrO. The compound [X] when treated with Sodium methoxide in methanol produces [Y] as the major product, the 1H NMR spectrum data for compound [X] are: 1H NMR:δ 1.17 (d, 6H), 3.02 (m, 1H), 4.10 (s, 2H). The compound X and Y, respectively, are:
The correct order of the rate constant for the following series of reaction (Where Z = CF3/CH3/OCH3) is:
Product (B) of the given reaction is:
Which one of the following statements is true?
Van Arkel method of purification of metals involves converting the metal to:
The adsorption of a gas is described by Langmuir Isotherm with equation constant, K = 0.5 K Pa–1 at 25°C. The pressure (in PK) when translational reaction coverage is 0.25 is:
A solution containing 4.5 mM of Cr2O72– and 15 mM of Cr3+ shows a pH of 2.0. Calculate the potential of half reaction. (E° of Cr2Cr72-→Cr3+ is 1.33 V)
Consider the following reaction and select the correct statement
Consider the following chemical reactions and choose the correct one(s):
Consider the equation Z=PV/RT Which of the following statements is correct?
In the depression of freezing point experiment, it is found that:
Which of the following graph correctly represent(s) equilibrium?
Molecule(s) or species do not exist is/are:
In which of the following compound(s), the color is due to the charge transfer spectra?
Consider the following statements:
a) If there is only one component, there are no degrees of freedom (F = 0) when there are three phases.
d) The phase diagram of sulfur contains a new feature: there are two solid phases, rhombic and monoclinic. The names refer to the crystal structures in which the S8 molecules arrange themselves. This gives rise to three triple points, indicated by the numbers on the diagram.
Choose the 18e– complex from the following:
Select the correct order(s):
Number of 1H NMR signal in following compound:
the number of M-M bonds in Cp(CO)Fe(u-CO)2Fe(CO)Cp?
Which of the following is true for a steady flow system?
Explanation: For a steady flow process, mass entering the system is equal to the mass leaving the system.
Number of M—M bond in Os4(CO)14:
20 g chunk of dry ice is placed in an empty 0.75 litre wine bottle tightly closed. What would be the final pressure (in atm) in the bottle after all CO2 has been evaporated and temperature reaches to 25°C?(rounded up to first decimal place)
The pH at which Mg(OH)2 begins to precipitate from a solution containing 0.10 M Mg+2 ions [KSP of Mg(OH)2 = 1 × 10–11] is:
Number of compound(s) which give negative Tollen's test:
(1) Sucrose (2) Lactose (3) Maltose (4) Glucose (5) Mannose
The number of molecules having bond angle greater than H2O are:
CH4, NH3, H2S, PH3, Cl2O, F2O
The normality of 0.3 M H3PO3 when it undergoes the following reaction,would be?
2 moles of ideal gas is expanded isothermally & reversibly from 1 liter to 10 liter. Find the enthalpy change in (kJ mol-1,rounded up to first decimal place ).
No. of moles(n) = 2 moles.
Temperature(T) = 300 K.
V₂ = 10 L, and V₁ = 1 L.
Universal Gas Constant (R) = 8.31 J/moleK.
Using the formula,
Work done = -2.303nRTlog(V₂/V₁) [For Chemistry.]
∴ Work done = -2.303 × 2 × 8.31 × 300 × log(10/1)
∴ Work done = -11482.758 J.
∴ Work done = -11.483 kJ.
Now, Process is Isothermal, therefore, Internal Energy will also be zero.
Thus, Using first Law of thermodynamics (of Chemistry and not of physics)
∴ ΔU = ΔQ + w
∴ ΔQ = - w
∴ ΔQ = - (-11.483)
∴ ΔQ = 11.483 kJ ≈ 11.4 kJ.
The Arrhenius parameter for thermal decomposition of NOCl, 2NOCl → 2NO (g) + Cl2 (g) are A = 107 m–1 S–1. Ea = 250 KJ/mol and RT = 4.5 KJ/mol. The enthalpy of the activated complex is:
Half-life of Na24 radioactive nuclei is 15 h the time in which the activity of sample of Na24 radioactive nuclei will decrease by 87.5% is (in hours, rounded up to first decimal place)
Number of hydrogen bonds in Guanine and Cytosine base pairs in DNA is?
The number of bridging carbonyl greens present in Fe3(CO)12 is:
for NaCl, HCl, NaA are 126.4, 425.9, 100.5 S cm2 mc –1 respectively. It the conductivity of 0.001 M Na is 5 × 10–5 S cm–1 degree of dissociation of HA is: (rounded up to three decimal place)
It the de-Broglie wavelength of the electron in the Bohr orbit in a hydrogenic atom in atom in equal to 1.5 πa0. Then the value of n/z is: (rounded upto two decimal place)
It Ksp of Ag2CO3 is 8 × 10–12. The molar solubility of Ag2CO3 in 0.1 m AgNO3 is x × 10–10 find x:
The solubility product of AgBr(s) is 5 × 10–13 at 298 K if the standard reduction potencial of the half cell is 0.07. The standard reduction patencial of (is volts is) (rounded upto two decimal place)
Integrate sin3ᴓ in the limit 0 to π/2.
The number of Mg ATP’s required in the reduction of N2 to ammonia is