The correct order of strength of acidity of the following compounds is
Answer The presence of electron withdrawing groups, such as nitro, increases the acidic strength of phenol, whereas the presence of... View Article
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If the distance between Na+ and Cl− ions in a sodium chloride crystal is X pm, the length of the edge of the unit cell is
Chloride ions at the corner and sodium ions at the edge centre touch each other in the fcc unit cell... View Article
The rate constant of a reaction depends on temperature, initial concentration of the reactants, time of reaction, extent of reaction
The rate constant of a reaction increases as the temperature rises, but it is unaffected by the initial concentration of... View Article
Which of the ethers will produce methyl alcohol on treatment with hot concentrated HI?
When tert butyl methyl ether is treated with hot concentrated HI, it produces methyl alcohol. Tert butyl iodide is the... View Article
Which of the following ions has the least flocculation value Cl−, SO2−4, PO3−4, [Fe(CN)6]4−
The higher the valence of the flocculating ion added, the more powerful it is in causing precipitation. This is referred... View Article
The correct order of the O−O bond length in O2,H2O2 and O3 is
The bond length of O−O in H2O2 is 147.5pm, in O3 is 128pm and in O2 it is 121pm, so... View Article
The hexaaquomanganese (II) ion contains five unpaired electrons while the hexacyano ion contains only one unpaired electron.
The electronic configuration of Mn(II) is 3d54s0. The ligand connected to the metal in the instance of hexaaquomanganese (II) ion... View Article
1ch4 4cl2 =ccl4 4hcl find equivalent mass
The number of g equivalent weight of CH4 is equal to the number of g equivalent weight of HCl, according... View Article
the electronic configuration of an element is [ne]3s2 3p3. what is the atomic number of the element which is just below the above element in the periodic table? *1 point
The element which present just below this element will have outermost electronic configuration as 4s24p3, so its full electronic configuration... View Article
which of the following is most reactive towards hcn
Acetone Formaldehyde Acetaldehyde Diethyl Ketone Answer The addition reaction of hydrogen cyanide to create cyanohydrin is most reactive with formaldehyde.... View Article
what is the weight of available oxygen from a solution of h2o2, if 20 ml of this solution needs 25 ml, N/20 kmno4 for complete oxidation?
Hydrogen peroxide reacts with potassium permanganate to get converted to oxygen as potassium permanganate is a very strong oxidizing agent... View Article
the density of ethanol 60 y wiegth is 0.8937 g/ml what is mlarity
The weight percentage or %w/w represents the weight ratio of solute and the solution.Molarity = Moles of solute/Volume of solution(L)... View Article
How many of the following can react with bases? (1) Al2O3 (2) MgO (3) BeO (4) SeO2 (5) NO2 (6) PbO (7) As2O3
Answer: An amphoteric compound is a molecule or ion that can react both as an acid and as a base.... View Article
for the elementary reaction, 2a b → products, the active mass of b is kept constant, and that of a is doubled. the rate of reaction will be
On doubling the active mass of A the rate of reaction increases 4 times. Rate = K[A]2[B]
100 ml of tap water containing ca(hco3)2 was titrated with n/50hcl with methyl orange as indicator. it 30 ml of hcl were required, what is the degree of temporary hardness as ppm.
Milli equivalent of Ca(HCO3)2 = miili equivalent of CaCO3 = mili equivalent of HCl N1V1 = N2V2 1000 × w/(100/2)... View Article
Reema took 5ml of lead nitrate solution in a beaker and added approximately 4ml of potassium iodide solution to it. what would she observe?
The relation between lead nitrate and potassium iodide is an example of precipitation reaction. Pb (NO3)2 + 2 KI ⟶... View Article
ASSERTION : Reducing character of hydrides of group 16 elements increases as the atomic number of central atom increases. REASON: Due to strong force of attraction of H-E bond
From top to bottom, the size of the elements and their atomic number rise in group 16. The bond energy... View Article
In which case is the number of molecules of water maximum?A. 10−3 mol of water.B. 0.00224 L of water vapour at 1 atm and 273 k.C. 0.18 g of water. D. 18 ml of water.
We must first determine the molar mass of water. Water’s molecular formula is H2O. 2(molar mass of hydrogen)+molar mass of... View Article
the freezing point of aqueous solution that contains 5 y mass urea, 1.0 y mass kcl and 10 y mass of glucose is
ΔTf = ΔTf(glucose)+ΔTf(KCl)+ΔTf(urea) But ΔTf = (Kf×W2/M2×W2)×1000 Therefore, [1000×1.86×10/100×180] + [1000×1.86×1×2/74.5×100] + [1000+1.86×5/100×60] = 3.069 = 273 – 3.069 =... View Article
nitric acid ( hno3) acts only as an oxidizing agent while nitrous acid(hno2)acts both as an oxidizing as well as reducingagent. explain.
The oxidation number of nitrogen is HNO3 = +5; nevertheless, the maximum oxidation number of nitrogen is +5 and the... View Article
