Ncert Solutions Chemistry Class 11th
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<p><strong>1.43. The mass of one atom of C-12 in grams is:</strong></p>
<p><strong>(a)</strong> 6.022 × 10<sup>23</sup> g</p>
<p><strong>(b)</strong> 6.022 × 10<sup>23</sup> kg</p>
<p><strong>(c)</strong> 1.99 × 10<sup>–23</sup> g</p>
<p><strong>(d)</strong> 1.99 × 10<sup>–23</sup> kg</p>
1.41. Assertion: In chemical reactions, the reactant, which gets consumed first, limits the amount of product formed and is called the limiting reagent.
R: Stoichiometry deals with the calculation of masses (sometimes volumes also) of the reactants and the products involved in a chemical reaction.
1.41. Assertion: In chemical reactions, the reactant, which gets consumed first, limits the amount of product formed and is called the limiting reagent.
R: Stoichiometry deals with the calculation of masses (sometimes volumes also) of the reactants and the products involved in a chemical reaction.
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 rea
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1.40. Assertion: SI unit of volume is L (litre).
R: But again, in chemistry laboratories, volumes is often denoted in cm3 or dm3 units.
1.40. Assertion: SI unit of volume is L (litre).
R: But again, in chemistry laboratories, volumes is often denoted in cm3 or dm3 units.
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.
Upvote 1.39. Assertion: Volume of a gas is inversely proportional to the number of moles of gas.
Reason: The ratio by volume of gaseous reactants and products agrees with their mole ratio.
1.39. Assertion: Volume of a gas is inversely proportional to the number of moles of gas.
Reason: The ratio by volume of gaseous reactants and products agrees with their mole ratio.
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.
Upvote 1.38. Assertion: 123.00 has three significant figures.
Reason: All numbers right to the decimal point are significant.
1.38. Assertion: 123.00 has three significant figures.
Reason: All numbers right to the decimal point are significant.
1.38 (d) 123.00 has five significant figures. Assertion is wrong statement while reason is a correct statement.
Upvote 10.10. The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain.
10.10. The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain.
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 wa
Upvote 10.9. Potassium carbonate cannot be prepared by Solvay process. Why?
10.9. Potassium carbonate cannot be prepared by Solvay process. Why?
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.
Upvote 10.8. State as to why
(a) Alkali metals show only +1 oxidation state. (b) Na and K impart colour to the flame but Mg does not.(c) Lithium on being heated in air mainly forms the monoxide and not the peroxide.(d) Li is the best reducing agent in aqueous solution.
10.8. State as to why
(a) Alkali metals show only +1 oxidation state. (b) Na and K impart colour to the flame but Mg does not.(c) Lithium on being heated in air mainly forms the monoxide and not the peroxide.(d) Li is the best reducing agent in aqueous solution.
(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
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