KVPY Interview: Chemistry Questions

Updated On -

Oct 8, 2020

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Shivani Tiwari

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KVPY (Kishore Vaigyanik Protsahan Yojana) is a national level scholarship program up to Pre-Ph.D level. It is organized by IISc Bangalore annually. For the year 2020, KVPY exam will be conducted on November 3, 2020. Get KVPY Latest news

KVPY Merit List is prepared by considering the scores obtained by the candidate in the Aptitude test and Interview.The evaluation is based on 75% marks of Aptitude test and 25% of performance in the interview. Check detailed KVPY Selection Procedure

For candidate to get the KYPY Scholarship, they have to clear the Personal Interview round. In the PI round, the interviewees look for intelligent, skilled, self-confident and bright candidates. Personal interview begins with self-introduction of the candidates. It is followed by a few technical questions to check the subject knowledge of the candidate. Check KVPY 2020: Exam Dates 

Given below are one of the most common questions asked from Chemistry section with answers: -

Ques. How can a mixture of sand, common salt and camphor be separated?

Ans. Sand, common salt, and camphor form a heterogeneous mixture and can be separated easily by physical methods of separation. By selecting the right order of methods of separation, the three can be easily separated:

(i) Camphor sublimes on heating;

(ii) Sand is insoluble in water; and

(iii) Common salt can be recovered by evaporation of its aqueous solution.

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Ques. India does not have much Uranium and therefore we have to depend on Uranium supplying countries for power generation. Is only uranium required to generate power?

Ans. No. Uranium is used as a fuel in nuclear power generation. Other, requirement includes:

  1. Moderator
  2. Steam Generator
  3. Control Rods
  4. Coolants
  5. Pressure Vessels

Ques. What is the method of separating Sulphur from a mixture of iron and Sulphur? Also, state the method of separating camphor and dry ice?

Ans. Using horse-shoe magnet by moving it on the surface of mixture will attract iron, thereby leaving behind only Sulphur.

Ques. Explain alloys with their characteristics. Why alloys cannot be called Solution? What is the main difference between elements and alloys?

Ans. An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character. In some cases, a combination of metals may reduce the overall cost of the material while preserving important properties. In other cases, the combination of metals imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Examples of alloys are steel, solder, brass

A solid solution, by definition, implies that the components mix perfectly to form a single phase. But metals in an alloy need not mix perfectly. An alloy could consist of one or more solid solutions. Also, an alloy is a homogenous mixture of two or more metals in the solid state.  In an alloy the metals will be found in their elemental state whereas in a solution of metals, the metals will be found as their salts.  In the solution, there will not be any metal - metal bonding.

Also Check Biology questions for KVPY Interview

Ques. Explain types of mixture. Give examples of each.

Ans. Mixtures can be either homogeneous or heterogeneous.

  • A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties. Example: Air
  • A heterogeneous mixture is a type of mixture in which the components can be seen, as there are two or more phases present. Example: Mixture of sand and sugar.

Ques. What is valency? What can be the maximum valency?

Ans. The combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.

Ques. What is Solution? Prepare solutions of any 5 types from the various objects present on your table.

Ans. A solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

  1. Solution of oxygen in nitrogen present in air
  2. Solution of gas in water
  3. Solution of sugar in water
  4. Solution of salt in water
  5. Solution of milk in water

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Ques. Write electronic configuration of Na and Cl.

Ans. In order to write the Na electron configuration we first need to know the number of electrons for the Na atom (there are 11 electrons). When we write the configuration, we'll put all 11 electrons in orbitals around the nucleus of the Sodium atom.

In writing the electron configuration for sodium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for sodium go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining electron in the 3s. Therefore, the sodium electron configuration will be 1s22s22p63s1. Proceed in similar fashion for Chlorine.

Ques. What are acids and bases? Write the name of any two acids which are easily found at home.

Ans. An acid is a molecule or ion capable of donating a hydron (proton or hydrogen ion H+), or, alternatively, capable of forming a covalent bond with an electron pair. A base accepts protons from any proton donor, and/or contains completely or partially displaceable OH− ions. It reacts with acid to form salts. Acids found at home: Citric acid, Acetic acid and Lactic acid

Ques. Do you have invertor at your home? Which acid does the battery of inverter possess?

Ans. Sulphuric Acid

Ques. Differentiate between metals and nonmetals.

Ans. Metals: Element that is typically hard, opaque, shiny, and has good electrical and thermal conductivity. Metals are generally malleable.
Non-Metals: Converse of above.

Ques. Which is the most suitable process of preparing electricity using turbine at power plant? -evaporation or boiling? and why?

Ans. Evaporation. It produces steam to run the turbine in order to produce electricity.

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Ques. What is the difference between soap and detergent?

Ans. Soaps are usually manufactured using natural materials while detergents are generally synthetic that were developed during World War II, when there was scarcity of oils that are used to make soaps. The most important difference between a soap and detergent is their behavior in water. A big drawback of washing with soap is that it forms a scum in hard water, which is not easy to clean and is known to turn laundry into a hue. Such is not the case with detergent.

Ques. Who discovered proton? What was the contribution of the Rutherford in the field of science?

Ans. Ernest Rutherford. Ernest Rutherford (1871 - 1937) discovered alpha and beta rays, set forth the laws of radioactive decay, and identified alpha particles as helium nuclei. Most importantly, he postulated the nuclear structure of the atom.

Ques. Name any two alloys of Tin and Aluminum.

Ans. Tin: Babbit, Britannium, Pewter

Aluminum: Magnalium, Duralumin, Alclad

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Ques. Name the sources which are responsible of spread of nitrogen based pollutants in the air.

Ans. Pesticides, Insecticides, Fertilisers.

Ques. Name and three greenhouse gases, except carbon dioxide.

Ans.The gases are

  1. Methane
  2. Water Vapour
  3. Ozone

Ques. Why do we feel hot as compared to other days on a cloudy day (few hours before the rainfall)?

Ans. When the humidity is low, sweat evaporates easily. Evaporation requires thermal (heat) energy, so evaporation is a cooling process. When our sweat evaporates, it cools our bodies. On a hot humid day, sweat does not evaporate as easily, so the body’s cooling mechanism does not work as well.

Ques. Is air a bad conductor of heat? How?

Ans. In a gas molecules have to scatter off molecules to exchange energy in larger distances, so the probability of transfer is much smaller. Air is a bad conductor because to conduct heat current molecules should absorb heat and transmit it to neighbor by vibrating.

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Ques. What is spontaneous combustion? Give two examples of the process, except for sodium. Describe any application of this concept to understand the observed phenomena.

Ans. Spontaneous combustion or spontaneous ignition is a type of combustion which occurs by self-heating or increases in temperature due to exothermic internal reactions followed by ignition. Linseed oil, manure and coal. Cotton and linen. When these materials come into contact with polyunsaturated vegetable oils (linseed, massage oils), bacteria slowly decompose the materials, producing heat. If these materials are stored in a way so the heat cannot escape, the heat buildup increases leading to ignition.

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Ques. How does the fire extinguisher work?

Ans. Water extinguishers work by removing heat from the fire. Dry chemical extinguishers are tanks of foam or dry powder with compressed nitrogen as the propellant. They work by smothering the fire: when you put a layer of powder or foam on the fire, you cut the fuel off from the oxygen around it, and the fire goes out.

Ques. Why do we spread wet clothes to make them dry?

Ans. Evaporation is a surface phenomenon. So, greater the surface area greater is the rate of evaporations and faster will be the process of drying.

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Ques. What is the relation between drying of clothes and humidity in the air?

Ans. Humid air already had moisture content. Drying of clothes therefore takes longer since humid air does not readily take further moisture.

Ques. Why our wet hairs stick with each other?

Ans. The hairs each stick to the water, and the water sticks to itself, because of the electrical attraction between the charged ends of water molecules. So, the hairs can't pull apart without either leaving one dry or pulling parts of the water apart.

Ques. Which other product (except the water) present in your kitchen can be used as a fire extinguisher?

Ans. Foam, Heavy blanket, Sand.

Ques. From which material is synthetic fiber made?

Ans. Synthetic fabrics are textiles made from man-made rather than natural fibers. Examples of synthetic fabrics include polyester, acrylic, nylon, rayon. Synthetic (chemically produced) fabrics are made by joining monomers into polymers, through a process called polymerization.

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*The article might have information for the previous academic years, please refer the official website of the exam.