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9.41.  (d) Hard water forms scum/precipitate with soap. Soap containing sodium stearate (C₁₇H₃₅COONa) reacts with hard water to precipitate out Ca/Mg stearate.It is, therefore, unsuitable for laundry. It is harmful for boilers as well, because of deposition of salts in the form of scale. This reduces the efficiency of the boiler.

9.40.  (c) The crystalline form of water is ice. Atatmospheric pressure ice crystallises in the hexagonal form, but at very low temperatures it condenses to cubic form. Density of ice is less than that of water. Therefore, an ice cube floats on water.  In winter season ice formed on the surface of a lake provides thermal insulation which ensures the survival of the aquatic life. This fact is of great ecological significance.

Yes, CSJM Kanpur University BTech admissions 2025 is based on the JEE Main scores/ ranks secured by the aspirants. Candidates with valid JEE Main ranks are required to visit the university's official website to register for the university-level counselling conducted by CSJMU. For the current academic year (2025-26), the last date to register for the first round of the counselling was May 10, 2025. The tentative registration dates for the subsequent rounds of CSJMU BTech counselling 2025 were as follows:

• Round 2: May 13, 2025 - May 27, 2025
• Round 3: May 30, 2025 - June 16, 2025

9.39.  (c) Lithium hydride is rather unreactive atmoderate temperatures with O₂ or Cl₂. It is, therefore, used in the synthesis of other usefulhydrides, e.g.,

8LiH + Al₂Cl₆  →   2LiAlH₄  + 6LiCl

2LiH + B2H₆  →  2LiBH₄

9.38.  (b) Loss of the electron from hydrogen atomresults in nucleus (H⁺) of ~1.5×10^–3 pm size.This is extremely small as compared to normalatomic and ionic sizes of 50 to 200pm. As a consequence, H⁺ does not exist freely and isalways associated with other atoms ormolecules.

9.37.  (a) H₂O₂ decomposes slowly on exposure to light.

2H₂O₂ (l) → 2H₂O (l) + O₂ (g)

In the presence of metal surfaces or traces ofalkali (present in glass containers), the above

reaction is catalysed. It is, therefore, stored inwax-lined glass or plastic vessels in dark.

In order to make a choice between BTech courses offered by SRM University and Amrita Vishwa Vidyapeetham, students can compare the options based on significant factors such as fees and Shiksha rating. To help, presented below is a comparison between the BTech courses at SRM University and Amrita Vishwa Vidyapeetham based on fees and ratings:

Note: The abovementioned information is as per official sources. However, it is subject to change. Hence, it is indicative.

Both SRM University and Mohan Babu University are good options to pursue a BTech. However, in terms of affordability, Mohan Babu University is more affordable since the tuition fees to pursue a BTech at SRM University range from INR 4.1 Lacs to INR 18.4 lakh, and the tuition fee to pursue a BTech at Mohan Babu University is INR 10 lakh.

Note: The fee mentioned above is as per the official sources. However, it is indicative and subject to change.

No, SGPA (Semester Grade Point Average) and percentage are two different systems for evaluating student performance. SGPA is a grade point system, usually on a scale of 0 to 10. On the other hand, percentage is used to express marks as a proportion of the total marks.

The application process for Manonmaniam Sundaranar University begins with the registration on the website. After registration, candidates are required to download and fill the application form and append supporting documents and pay slip. Filled up, the form is to be submitted in person or by mail to the department of the university.

No, Manonmaniam Sundaranar University does not provide direct admission on the basis of Class 12 marks. For the majority of UG and PG courses, the university has a merit-based or entrance-based selection. But if you are eligible, your Class 12 marks will be an important factor in the merit list.

Manonmaniam Sundaranar University offers both merit as well as entrance-based admissions. Students are selected on the basis of merit in the last qualifying exam for courses like MSc, MA, MCom, and BBA. However, for courses like MBA/PGDM, students have to clear the TANCET exam.

Yes, Manonmaniam Sundaranar University provides admission without an entrance test for most of their courses. Courses such as MSc, MA, MCom, and BBA are chosen on the basis of merit from qualifying exams. But some courses like MBA/PGDM require entrance tests like TANCET for admission.

To obtain admission to Manonmaniam Sundaranar University, candidates must first download the application form from the official website. Once the application form is filled, it has to be submitted in person or by post to the respective department. Based on the course, admission is merit-based or entrance-based, and entrance tests such as TANCET for MBA/PGDM and merit lists for courses like MSc, MA, and BBA.

Yes, Nav Chetna College provides direct admission to the BCom course on merit. There is no entrance test for admission. Eligible students can apply online and get admission after verification of documents and payment of fees.

To be eligible for the BCom course at Nav Chetna College, candidates should have passed Class 12 with minimum 45% marks in any stream. No entrance exam is required for BCom admission. Admission is done on the merit of the last qualifying examination.