CBSE Class 11 - Chemistry Chapter 9 - Hydrogen - Very Short Questions Answers (VSQA) (#cbsenotes)(#eduvictors)

Class 11 - Chemistry 

Chapter 9 : Hydrogen 

Very Short Questions Answers 

Q1: Name the first element of periodic element. What is its electronic configuration?

Answer: Hydrogen is the first element in the periodic table and also the lightest element known. Electronic configuration of Hydrogen is 1s¹.


Q2: Name the three isotopes of hydrogen.

Answer:
(i) Protium (¹H₁)
(ii) Deuterium ( ¹H₂ or ¹D₂)
(iii) Tritium ( ¹H₃ or ¹T₃)


Q3: Which isotope of hydrogen is radioactive?

Answer: Tritium


Q4: How is dihydrogen prepared commercially?

Answer: By electrolysis of acidified water.


Q5: What is the importance of heavy water with regard to nuclear power generation?

CBSE Class 8/9/10 - Reading Comprehension (Unseen Passage) - Set-13 (#cbsenotes)(#eduvictors)

 Reading Comprehension

(Unseen Passage) - Set-13

Read the passage given below and answer the questions that follow:

WORK SMARTER NOT HARDER

You can work all day on a vital project without making any apparent progress into it — even though you have slogged hard, focused all your energies and even give up your lunch break to squeeze in more time. Your colleague, on the other hand, completes the same task in half-a-day and without any errors and leaves office with a smile. So why this huge difference in output? The answer lies in not being able to maximize productivity and minimize timelines. There is a vital difference between working hard and working smart and the letter is the way to accomplishing more in less time. Here are some ways in which you can become a smarter worker.

Plan and Assess: The biggest secret of success of smart workers is planning. Half the job is accomplished if you are able to plan in advance. Assess the work at hand, think about each aspect of

it in detail and then draw up a plan of action—either in your mind or on your paper. It allows you to tackle the job with focus and prevents oversights, wrong turns or misjudgements.

CBSE Class 7 - History - Chapter 7 - Tribes, Nomads and Settled Communities (#cbsenotes)(#eduvictors)

Chapter 7 - Tribes, Nomads and Settled Communities

Q & A

Q1: What was the varna system of the Indian society?

Answer: In large parts of the subcontinent, society was divided according to the rules of Varna. These rules, as prescribed by the Brahmanas, were accepted by the rulers of large kingdoms. The difference between the high and low, and between the rich and poor, increased. Under the Delhi Sultans and the Mughals, this hierarchy between social classes grew further.


Q2: Who were tribals?

Answer: Many societies in the subcontinent did not follow the social rules and rituals prescribed by the Brahmanas. Nor were they divided into numerous unequal classes. Such societies are often called tribes. People of these tribes were called the tribals.

Q3: Fill in the blanks

1. In Punjab, the ________ tribe was very influential during the 13th and 14th century.
2. The ________ was a large and powerful tribe in the northwest.
3. ______ and _______ were the two tribe of northeast.
4. ______ and _______ were the two tribes of Maharashtra.

Answer:
1.  In Punjab, the Khokhar tribe was very influential during the 13th and 14th century.
2. The Balochis was a large and powerful tribe in the northwest.
3. Nagas and Ahoms were the two tribes of the northeast.
4. Kolis and Berads were the two tribes of Maharashtra.

CBSE Class 9 - English - Moments - Chapter - The Snake and The Mirror (Chapter Summary and Questions and Answers)(#cbsenotes)(#eduvictors)

The Snake and The Mirror

Chapter Summary and Q & A

Author: Vaikom Muhammad Basheer

Summary:

1. A lonely unmarried Homeopathy specialist lived in a non-zapped leased life with his few visiting rodents and cats.

2. On a hot summer night, the doctor came back to his room after dinner and heard a noise, when he opened the door. Noise, being a familiar one, he did not pay any attention to it and lay down on his bed but could not sleep.

3. He took out a book, opened it on the table. He looked into the large mirror kept on the table and admired himself as a young, handsome, unmarried doctor.

CBSE Class 12 - Physics - Chapter 11 - Dual Nature Of Radiation and Matter - Very Short Questions Answers (#cbsenotes)(#eduvictors)

Class 12 Physics

Dual Nature Of Radiation and Matter  

Very Short Questions Answers

Q1: Write the relationship of de-Broglie wavelength λ associated with a particle of mass m in terms of its kinetic energy K.

Answer: Kinetic Energy (K) = p²/2m
    where p = momentum and m = mass.
    ∴ p = √2mK

    ∴ de-Broglie wavelength λ = h/p = h/ √2mK


Q2: Mention one physical process for the release of an electron from the surface of a metal?

Answer: Photoelectric emission.


Q3: Name an experiment which shows the wave nature of the electron. Which phenomenon was observed in this experiment using an electron beam?

Answer: Davisson-German experiment shows the wave nature of the electron. Phenomena of constructive interference were observed in the Davisson-Germer experiment.


Q4: What is Thermionic emission?

Answer: It is the phenomenon of emission of electrons from the metal surface when heated suitably.

Geography - The Composition of the Earth's Crust (#eduvictors)(#cbsenotes)

Geography

The Composition of the Earth's Crust

Class 10 - Chemistry - Carbon and Its Compounds - Study Notes - Download PDF (#cbsenotes)(#eduvictors)

CBSE Class 10 - Chemistry 
 Carbon and Its Compounds - Study Notes (PDF)

Chemistry is that branch of science which deals with the composition, structure and properties of matter. Organic chemistry is predominantly concerned with the reactions that organic molecules undergo. Hydrocarbons are compounds that contain only carbon and hydrogen atoms. Carboxylic acids contain both a carbonyl group (C=O) and a hydroxyl group (–OH) on a terminal carbon. Carboxylic acids, like aldehydes, are terminal functional groups.

Here follows the class 10 Chemistry - Carbon and Its Compounds notes available as pdf file.