Question Discussion & Solution

The correct answer is gain of oxygen

Concept:

Chemical Reactions:

• A process in which one or more compounds are formed as products completely different from the reacting substances is known as a chemical reaction.
• There is generally a change in heat, colour, or appearance when a chemical reaction takes place.
• The evolution of gas may also occur.
• A chemical reaction may be reversible or irreversible in nature.

Oxidation reaction:

• Oxidation Reaction refers to a reaction in which either the addition of Oxygen takes place or the removal of Hydrogen takes place.
• It can also be said as the process of loss of one or more electrons by atoms or ions.
• Example is:

Mg + O2 = Mg2O

Reduction Reaction:

• Reduction Reaction refers to a reaction in which either the addition of Hydrogen takes place or the removal of oxygen takes place.

• In the process of reduction, a chemical species also gains electrons.
• It is the reverse of the oxidation reaction.
• Example is:

H2 + F2 → HF

Explanation:

Oxidation is a chemical reaction that is characterized by 

• loss of electron
• addition of oxygen atom
• removal of the hydrogen atom 

The substance that undergoes oxidation is said to be oxidized.

The loss of electrons and an increase in the oxidation state are the characteristics of an oxidation reaction.

For example:

H2S + Cl2 → 2HCl + S

In this reaction, the chlorine is getting reduced to hydrochloric acid (HCl) on the addition of hydrogen provided by Hydrogen sulfide (H2S).

The correct answer is option 4) i.e. All of the above

CONCEPT:

• Magnetic field: The region around a magnet where its influence is experienced is called the magnetic field.
  • The visual representation of the magnetic field is called magnetic field lines.

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• ​Properties of magnetic field lines:
  1. ​​The field lines start from the north pole and end at the south pole.
  2. The field lines are crowded where the magnetic field is the strongest.
  3. The field lines form continuous curves.
  4. The field lines do not intersect.

EXPLANATION:

• The magnetic field is strongest near the poles. Since magnetic field lines start and end at poles, they converge towards the region of strong magnetic force.
• Two magnetic field lines cannot intersect. If they did, at the point of intersection, the magnetic field will have two directions - which is not possible.
• The magnetic field lines have direction as they are represented as flowing, though no actual movement occurs. So, they do not move.

Therefore, all the given statements are true.

Energy is a phenomenon which is transferred from one object to another in the form of heat, as a result, it performs work. When the energy is transferred from one object to another, it changes its form and this phenomenon is called conservation of energy. The following types of energy are discussed below:

• Solar Energy: It is the energy that is derived from the sun. When solar cells are exposed to the sun, it converts solar energy in electrical energy. Important facts related to the solar energy:
  • India ranks 5^th globally in the installed Solar Energy.
  • India has about 34.5 GW installed solar capacity at present.
  • Ndia targes 175 GW of renewable energy by 2022.
• Chemical Energy: It is the energy that is released when a chemical reaction takes place. Its applications are in the creation of energy in our body, photosynthesis, electric cells.
• Nuclear Energy: This energy is either produced by nuclear fusion or nuclear fission. Nuclear fusion is a process when two nuclei are combined to release energy while nuclear fission is a process in which a single nucleus breaks into two parts to release energy.
• Magnetic Energy: Energy caused by the production of the magnetic field is called magnetic energy. This energy is used in making electrical bells, electric motors and generators.

Hence, we conclude that solar energy causes solar energy to transform electrical energy.

The set of given words are Deer, Cow, Giraffe are herbivorous. The most similar word is Horse. Shark, Hyena and Lion are different from Horse of the set of given words.

Hence, "Horse" is the correct answer.

The correct answer is 22 February 2021.

• Under the vaccination program in Rajasthan, the first phase of Intensified Mission Indradhanush-3 started from 22 February 2021.

Key Points

• First phase of intensive mission Indradhanush-3:
  • Medical and Health Minister Dr. Raghu Sharma launched this special campaign of vaccination from Bhilwara district.
  • According to the instructions of the Union Health Ministry, this campaign will be conducted for 15 days in two phases and the related vaccines will be given free of cost to the children and pregnant women who are deprived of regular vaccination.
    • In the first phase, 24 districts of the state have been included. A total of 3,963 vaccination sessions will be conducted in these.
    • A target has been set to immunize 23,980 children from birth to 2 years of age and 6,268 pregnant women through the relevant vaccines.