Daily Practice Problems undefined Water

Question 1:

Which among the following is an advantage of hardwater?

(a) Hardwater is fit for washing clothes by using soap.

(b) Ca & Mg present in hardwater in small amounts are essential for the growth of our teeth & bones.

(d) Hardwater is used for production of steam. [Level: Moderate]

Question 2:

Particle size of solute in case of solution is

(a) more than 10^-10 m

(b) 10^-7 m

(d) 10^-5 m [Level: Easy]

Question 3:

When NaOH pellets are exposed to air, there will be

(a) Increase in mass

(b) Decrease in mass

(d) Fluctuation in value of mass [Level: Difficult]

Question 4:

Substance which contains water of crystallization is

(a) Ammonium chloride

(b) Alumina

(d) Quicklime [Level: Moderate]

Question 5:

Anand lives in a locality which is supplied with hardwater. He came to know that it is temporary hardwater. So, he advised his mother to boil the water before drinking so that water becomes soft as well as boiling would get rid of germs. Give chemical reactions which explains how temporary hardwater gets softened. [Level: Moderate]

Question 6:

Name any two gases which are found dissolved in natural water. [Level: Easy]

Question 7:

Raj has saturated salt solution in a beaker at 25⁰C. He kept the beaker in fridge. What would he observe after some time?

(a) no change

(b) change in colour

(d) saturated solution becomes unsaturated [Level: Difficult]

Question 8:

If substance loses its water of crystallisation partially then it is said to be

(a) Anhydrous

(b) Hydrated

(d) Deliquescent [Level: Moderate]

Question 9:

Rocky was given copper (II) sulphate crystals. His teacher told him to remove all water of crystallisation from copper (II) sulphate crystals. How can he remove all water of crystallisation? [Level: Moderate]

Question 10:

Which among the following compound/compounds is/are soluble in water?

I. MgSO₄

II. CaCO₃

III. MgCO₃

IV. Ca(HCO₃)₂

(a) II

(b) III

(d) only I [Level: Difficult]

Question 11:

If MgSO₄ is present in hardwater, hardness can be removed by:

(a) Only adding Na₂CO₃

(b) Boiling

(d) Adding Na₂CO₃ & slaked lime [Level: Difficult]

Question 12:

Name the solute & solvent in aqueous sugar solution. [Level: Easy]

Question 13:

Sita has solution that contains maximum amount of solute that is capable of being dissolved at a given temperature. Which type of solution is Sita having?

(a) Saturated solution

(b) Unsaturated solution

(d) Aqueous solution [Level: Moderate]

Question 14:

Which among the following substances loses water of crystallisation when exposed to dry air?

(a) Sodium hydroxide

(b) Potassium hydroxide

(d) Glauber’s salt [Level: Moderate]

Question 15:

Which among the following is deliquescent substance?

(a) Glauber’s salt

(b) Epsom salt

(d) FeCl₃[Level: Moderate]

Question 16:

Which compounds of Ca/Mg are responsible for permanent hardness of water? [Level: Easy]

Question 17:

Name the following:

(a) The sticky substance formed when soap is added to hardwater.

(b) Heterogeneous mixture in which solute having particle size greater than

10^-7 m is dispersed in medium which later settles down at the bottom. [Level: Easy]

Question 18:

Nutan’s locality didn’t receive soft water for almost seven days. As a result, she ordered water tankers which supplies hard water. She has dry cleaning business but the problem is hardwater is unfit for washing purposes. Given below are some solutions:

I. Soften the hardwater by boiling

II. Soften the hardwater by adding sodium carbonate

III. Use synthetic detergent & avoid using soap

IV. Use soap & avoid using synthetic detergents

Select the option corresponding to correct solution to the problem:

(a) only I

(b) II, III

(d) only IV [Level: Difficult]

Question 19:

In case of certain solutes like sodium acetate, their saturated solution when cooled does not result into appearance of their crystals. Can you tell what should be done so that crystals start to reappear from such solution? [Level: Difficult]

Question 20:

Give balanced equation for the following conversion:

Sulphur dioxide to sulphurous acid using a neutral liquid. [Level: Moderate]

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Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic ICSE 8 Chemistry Water you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
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Identifying Knowledge Gaps: When you attempt to solve problems, you may encounter areas where your understanding is lacking. These knowledge gaps become evident during problem-solving, and you can then focus on filling those gaps through further study and practice. You can refer Water ICSE 8 Chemistry Notes on LearnoHub.com
Boosting Confidence: Successfully solving problems after learning a theoretical concept boosts your confidence in your abilities to handle Water. This confidence motivates you to tackle more challenging tasks and improves your overall performance in the subject.
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Life Skills Development: Problem-solving is a valuable life skill that extends beyond academics. It equips you with the ability to tackle various challenges you may encounter in personal and professional life.
Improving Decision Making: Problem-solving involves making decisions based on available information and logical reasoning. Practicing problem-solving enhances your decision-making skills, making you more effective in making informed choices.

In summary, problem-solving after learning a theoretical concept on CBSE Water ICSE 8 Chemistry is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on ICSE 8 Chemistry Water NCERT Chapter 8

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on ICSE 8 Chemistry Water NCERT Chapter 8 useful.

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