CBSE Class 11 Chemistry VBQs Hydrogen

Scroll down for PDF

CBSE Class 11 Chemistry VBQs Hydrogen. Value based questions are very important and always form part of examinations and class tests. Students are requested to download the VBQs and practice them to get better marks in examinations. 

UNIT – 9 (HYDROGEN)

Question 1. Prakash was surprised to see that air painting get furnished. Prakash discussed this matter with his elder brother Manoj. He also wanted to Manoj explained him the reason and also the method to restore the original whiteness.

(a) Can you predict what explanation was given by Manoj?

(b) Analyse the attitude of both Prakash and Manoj?

(c) H2O2 act as an oxidizing agent as well as reducing agent. Why?

Question 2. Teacher told the students that water should that water should be softened before using in boilers. Karina one of the students, asked the reason. The teachers explained the reason in detail to him and then Karina got satisfied.

(a) Predict the explanation given by the teacher.

(b) Temporary hard water becomes soft on boiling. Why?

(c) What values are displayed by Karina.

Question 3. Hard water is unfit for its use in the laboratory and laundry because of the presence of chlorides of calcium and magnesium. One way to remove these ions from hard water is the use of sodium carbonate. Your teacher asked you to calculate the amount of sodium required to remove the calcium ions from a sample of hard water which is 0.002 M in calcium ions.

(a) Write the reaction of sodium carbonate in the removal of hardness of water.

(b) What mass of sodium Carbonate is required to remove the calcium ions from a sample of 1000 litres of hard water?

(c) Write the value associated with this problem.

Question 4. A compound of hydrogen and oxygen has empirical formula OH. This compound is used to restore the colour of old oil paintings containing lead oxide. This compound also liberates iodine from an acidified solution of potassium iodide.

(a) Name this compound and write its formula.

(b) Write a balanced chemical equation to show the restoration of colours of the old painting by this compound.

(c) Mention the value associated with the function of this compound.

 Please click the link below to download CBSE Class 11 Chemistry VBQs Hydrogen.

Tags: 


Click on the text For more study material for Chemistry please click here - Chemistry

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

UP government schools will follow NCERT

UP government schools will follow NCERT pattern from April 2020Are you appearing for the UP exams 2020? If yes, then you have to see what major changes UP government schools have brought for 2020.The UP government is fully prepared to implement NCERT pattern for...

5 Signs Why Your Child Needs a Tutor

Is your child struggling at school? Are they leaving assignments incomplete? When it comes to education every student is different. Some children do well with the help of the teacher at school and an active parent while others need extra help. When children have...

CBSE schools to have sports period daily for classes 1 to 12

All work and no play makes a child dull. Nowadays students have a very hectic schedule so that they cannot take out time to play games and gently start ignoring sports. Therefore, it is the responsibility of schools to include physical education in the curriculum so...

Class 10 and 12 exam 2020 application process for private candidates

CBSE 10th, 12th exam 2020 application process for private candidates begins to apply by 30th Sept at cbse.nic.in CBSE Board Exam 2020 application begins: The Central Board of Secondary Education (CBSE) has officially started the online application process for the...

CBSE Board Practical Exam 2020

CBSE Board Practical Exam 2020: Important changes in date sheet, internal/external examiners and more Are you doing preparations for class 10 and 12 CBSE board exams? If yes, then you have to see what major changes CBSE has brought in the CBSE date sheet for class 10...

Top Classroom Challenges According to the Teachers

Teacher plays a major role in our lives in the classrooms. Not only is studying, but the teacher also serves many other roles in the classrooms. A teacher is always a role model for a student who can inspire him to live a better future life. Besides this, life of a...

×
Studies Today