Ncert Solutions Chemistry Class 11th
Get insights from 2k questions on Ncert Solutions Chemistry Class 11th, answered by students, alumni, and experts. You may also ask and answer any question you like about Ncert Solutions Chemistry Class 11th
Follow Ask QuestionQuestions
Discussions
Active Users
Followers
New answer posted
6 months agoContributor-Level 10
1.48.
Molarity | Molality |
The molarity of a given solution is defined as the total number of moles of solute per litre of solution. | Molality is defined as the total moles of a solute contained in a kilogram of a solvent. |
The mathematical expression is- M = number of moles of the solute /Volume of solution given in terms of litres. M = (g ? 1000)/(W ? V). | The mathematical expression is- m = Numbers of moles of solute/Mass of solvent in kgs m = (g ? 1000)/(W ? m). |
Depends on the volume of the whole solution. | Depends on the mass of the solvent. |
Unit sign expressed as (M). | Unit sign expressed as (m). |
Molarity has a unit of mol/litre. | Molality has units of mol/kg. |
New answer posted
6 months agoContributor-Level 10
1.47. These rules for determining the number of significant figures are stated below:
(1) All non-zero digits are significant. For example, in 285 cm, there are three significant figures and in 0.25 mL, there are two significant figures.
(2) Zeros preceding to first non-zero digit are not significant. Such zero indicates the position of decimal point. Thus, 0.03 has one significant figure and 0.0052 has two significant figures.
(3) Zeros between two non-zero digits are significant. Thus, 2.005 has four significant figures.
(4) Zeros at the end or right of a number are significant, provided they are on the right side of the decimal po
New answer posted
6 months agoContributor-Level 10
1.45. (d) 36 g of water
CH4 + 2O2 → CO2 + 2H2O
1 mol of CH4 reacts with 1 mol O2 of to produce 2 moles of H2O
It means that 16g of CH4 reacts with oxygen to produce (2x18)= 36g of water
New answer posted
6 months agoContributor-Level 10
1.43. (c) The mass of 1 mole of C-12 atoms = 12 g
1 mole of C- atoms = 6.022 * 1023 atoms
The mass of 1 atom of C-12 = 12 / (6.022 * 1023)
= 1.99 * 10–23 g
New question posted
6 months agoNew answer posted
6 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
6 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.
Taking an Exam? Selecting a College?
Get authentic answers from experts, students and alumni that you won't find anywhere else
Sign Up on ShikshaOn Shiksha, get access to
- 65k Colleges
- 1.2k Exams
- 679k Reviews
- 1800k Answers