Ncert Solutions Chemistry Class 11th
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11 months agoNew answer posted
11 months agoContributor-Level 10
1.41. (b) Both the statements are correct but the second statement is not the actual reason for the first statement.
Many a times, reactions are carried out with the amounts of reactants that are different than the amounts as required by a balanced chemical reaction. In such situations, one reactant is in more amount than the amount required by balanced chemical reaction.
The reactant which is present in the least amount gets consumed after sometime and after that further reaction does not take place whatever be the amount of the other reactant. Hence, the reactant, which gets consumed first, limits the amount of product formed and
New answer posted
11 months agoContributor-Level 10
1.40. (d) Volume is the amount of space occupied by a substance. It has the units of (length)3. In SI system, volume has units of m3. Smaller volumes are denoted in cm3 or dm3 units. A common unit, litre (L) which is not an SI unit, is used for measurement of volume of liquids.
New answer posted
11 months agoContributor-Level 10
1.39. (d) Taking reference of the ideal gas equation PV= nRT (Where, P= Pressure, V= volume, n=no of moles, R= gas const, T= temperature). It can thus be concluded that volume is directly proportional to the no. of moles.
New question posted
11 months agoNew answer posted
11 months agoContributor-Level 10
1.38 (d) 123.00 has five significant figures. Assertion is wrong statement while reason is a correct statement.
New answer posted
11 months agoContributor-Level 10
All the compounds are crystalline solids and their solubility in water is guided by both lattice enthalpy and hydration enthalpy. In case of sodium and potassium compounds, the magnitude of lattice enthalpy is quite small as compared of sodium and potassium that are mentioned, readily dissolve in water. However, in case of corresponding magnesium and calcium compounds, the cations have smaller sizes and more magnitude of positive charge. This means that their lattice enthalpies are more as compared to the compounds of sodium and potassium. Therefore, the hydroxides and carbonates of these metals are only sparingly soluble in water.
New answer posted
11 months agoContributor-Level 10
This is due to the reason that potassium bicarbonate (KHCO3) formed as an intermediate (when CO2 gas is passed through ammoniated solution of potassium chloride) is highly soluble in water and cannot be separated by filtration.
New answer posted
11 months agoContributor-Level 10
(a) Alkali metals have low ionization enthalpies.
They have a strong tendency to lose 1 electron to form unipositive ions. Thus they show an oxidation state of +1 and are strongly electropositive.
(b) Valence electrons of alkali metals like Na and K easily absorb energy from the
flame and are excited to higher energy levels. When these electrons return to the ground state, the energy is emitted in the form of light.
Magnesium atom has small size so electrons are strongly bound to the nucleus. [ Thus they need large amount of energy for excitation of electrons to higher
energy levels which is not possible in Bunsen flame.
(c)Due to the sma
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