InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1551. |
How is oxygen prepared from air ? |
| Answer» SOLUTION :When air is liquefied, the major components of air, NITROGEN and oxygen can be separated by subjecting the liquids to FRACTIONAL EVAPORATION. Nitrogen has a lower boiling point, and HENCE boils off and oxygen has a higher boiling point, and hence remains behind. | |
| 1552. |
How is ore concentrated in the gravity separtion process ? Explain. |
| Answer» SOLUTION :N/A | |
| 1553. |
How is nitrogen isolated from liquid air ? |
| Answer» SOLUTION :N/A | |
| 1554. |
How is hydrogen obtained from alkali. |
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Answer» SOLUTION :`Al+2NaOH+2H_(2)Oto2NaAlO_(2)+3H_(2)` `Zn+2NaOHtoNa_(2)ZnO_(2)+H_(2)` |
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| 1555. |
How is H_2S used as an analytical reagent ? |
| Answer» SOLUTION :N/A | |
| 1556. |
How is electropositive character related to reducingproperty of an element ? How does it vary in the group? |
| Answer» Solution :Electropositive character is DEFINED as the tendency of the element to LOSE electornic raducing porperty of an element is its ability to GIVE up ELECTRONS(s) and by virute of this ability it reduced the other element .The greater the electropositive charcater the more is its reducing property in a group reducing property increases from top to BOTTOM as electropositive character increases from top to bottom | |
| 1558. |
How is chlorine gas prepared ? |
| Answer» SOLUTION :N/A | |
| 1559. |
How is a mixture of common salt, oil andwater separated? You can use a combination of different methods. |
| Answer» Solution :The mixture of common salt, oil and water are taken in a BEAKER. The salt dissolves in water. Allow it to stand for a few MINUTES. The mixture of two immiscible LIQUIDS is separated by a separating funnel. The oil floats on top. The water can carefully be separated by opening the stopcock in the separating funnel. The oil is left behind in the separating funnel. The saalt water is heated slowly, in a distillation FLASK with a water condenser. The PURE water vapour passes through the inner tube of the condenser. The vapours on cooling condense into pure water and are collected in a receiver. The salt is left behind in the flask as a residue. | |
| 1560. |
How does the water kept in an earthen pot (matka) become cool during summer? |
| Answer» Solution :There are some pores in an EARTHEN pot through which the LIQUID INSIDE the pot evaporates. This EVAPORATION makes the water insidethe pot cool. In this way, water kept in an earthen pot becomes cool during summer. | |
| 1561. |
How does the water kept in a earthen pot (matka) become cool during summer? |
| Answer» Solution :The earthen pot has pores. Water OOZES out through these pores and GETS evaporated from the surface of the pot. Evaporation CAUSES cooling. So, the water kept in an earthen pot BECOMES cool during SUMMER. | |
| 1562. |
How does the water kept in an earthen pot (mataka) become cool during summer? |
| Answer» Solution :The earthen pot (or matka) has a large number of extremely SMALL PORES in its walls. Some of the water kept in the earthern pot continuously KEEPS seeping through these pores to the outside of the pot. This water evaporates (changes into vapour) continuously by taking the LATENT heat of vaporisation from the earthen pot and the remaining water. In this way, the earthen pot and remaining water lose heat and get cooled. | |
| 1563. |
How does the unrestricted growth of weeds in water bodies affect the aquatic animals ? |
| Answer» Solution :The WATER bodies become DEFICIENT in OXYGEN .So, AQUATIC LIFE is a endangered. | |
| 1564. |
How does the rate of diffusion change wth temperature? |
| Answer» Solution :The particles of matter are moving contiously. So they POSSES kinetic ENERGY. With the rise in temperature, the kinetic energy of particles INCREASES and they move faster. Therefore the RATE of diffusion increases. | |
| 1565. |
How does the melting point of a substance indicate the strength of its intermolecular force of attraction? |
| Answer» Solution :HIGHER the MELTING POINT of a SUBSTANCE, higher is the intermolecular force of attraction. | |
| 1566. |
How does themagnitude of effective nuclear charge influence the electon affinity of an element ? |
| Answer» Solution :The NUCLEUS has postive CHARGE and hence it attrcts the eletrons present in the atom .As the distance of electons FORM the nucleus increses the attraction experienced by elctrons because of nuclear charge decreases .The NET nuclear ofrce of attraction experienced by the electron is CALLED effective nuclear charge .The greater the effective nuclear charge the higher is the electron affinity of an atom | |
| 1567. |
How does the buring of coal lead to air pollution as well as water pollution ? |
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Answer» Solution :(i) impurities in coal (II) different REACTIONS of coal on burning . (iii) EFFECT of products of burning of coal on envn ronmental POLLUTION |
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| 1568. |
How does the atomic size vary along a group and a period? Give reasons and explainwith the help of an example |
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| 1569. |
How does soda water help in digestion of food after overeating ? |
| Answer» SOLUTION :In soda water, `CO_2` DISSOLVES in water to form CARBONIC acid which creates an acidic medium in the digestive SYSTEM and helps in digestion of EXCESS food. | |
| 1570. |
How does ionisation potential vary in a group and in a period? |
| Answer» | |
| 1571. |
How does ionisation potential electron affinity electropositivieoxidizing and reducing capacity vary along a group and a peroid ? Give reason s |
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| 1572. |
How doeshumus increase the fertility of the soil ? |
| Answer» SOLUTION :Humus PROVIDES minerals to the soil. It ABSORBS WATER and maked the soil porous. The FERTILITY of the soilis thus inreased. | |
| 1573. |
How does galvanic cell produce electricity? |
| Answer» SOLUTION :In a galvanic cell, at anode oxidation takes place which releases electrons. These electrons are attracted by cathode and hence the electrons flowing from anode to cathode are gained in REDUCTION REACTION. As LONG as the redox reaction proceeds, there is a flow of electrons and hence ELECTRICITY. | |
| 1574. |
How does electronegativity vary along a group and along a period? Give reasons and explain with examples |
| Answer» | |
| 1575. |
How does an atom differ from a molecule? |
| Answer» SOLUTION :An atom is the smallest particle of an ELEMENT which may not have independent existence. A molecule is the smallest particle of an element or a COMPOUND having independent existence. | |
| 1576. |
How does a catalyst influence the rate of a reaction ? |
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| 1577. |
How do you represent rate of a reaction with respect to reactants and products ? What are the units ? |
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| 1578. |
How do the oxidizing and reducing capacity of an element depend on theionisation potentialand electron affinity? |
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| 1579. |
How do atoms exist? |
| Answer» Solution :ATOMS of most elements do not EXIST independently. Atoms form molecules and ions. [Noble gases like HELIUM, NEON, argon, etc. are EXCEPTION.] | |
| 1580. |
How do atoms attain Noble gas electronic configuration? |
| Answer» Solution :ATOMS of all elements, other than inert gases, combine to form molecules because they have incomplete valence shell and TEND to ATTAIN a stable electronic configuration similar to NOBLE. gases. Atoms can combine either by transfer of valence electrons from one atom to ANOTHER or by sharing of valence electrons in order to achieve the stable outer shell of eight electrons. | |
| 1581. |
How did rutherford conclude that nucleus of an atom is massive ? |
| Answer» | |
| 1582. |
How can you separate the particles of a solid present in a heap of rice ? |
| Answer» SOLUTION :By WINNOWING . | |
| 1583. |
How can you separate the particles of a solute from a suspension ? |
| Answer» SOLUTION :The PARTICLES of a solute can be SEPARATED from a suspension by the processof filtration . | |
| 1584. |
How can you recognise the state of equilibrium ? |
| Answer» | |
| 1585. |
How can you obtain pure water from a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ? |
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| 1586. |
How can you make a reversible reaction irreversible ? Give an example. |
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| 1587. |
How can you distinguish between equilibrium position and equilibrium constant ? Give an example. |
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Answer» SOLUTION :(i) balanced chemical equation for the formation of `SO_(3)` (ii) relation between `K_(c )` and temperature (III) type of reaction based on change in `K_(c )` with temperature (iv) EFFECT of temperature on equilibrium (v) temperature, pressure conditions REQUIRED to increase the yield of `SO_(3)` (vi) effect of change in concentrations of `SO_(2), O_(2), SO_(3)` on equilibrium. |
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| 1588. |
How can we obtain different gases from air ? Draw a flow diagram. |
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Answer» SOLUTION :Air is a homogeneous MIXTURE of gases. The components of air can be SEPARATED by fractional distillation. The FLOW diagram given below steps involved in the process : 
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| 1589. |
How can we increase the solubility of a solute in a saturated solution ? |
| Answer» SOLUTION :The SOLUBILITY of a SOLUTE in a saturated solution can be INCREASED by increasing the temperature of the solution. | |
| 1590. |
How are the reversible and irreversible reactions represented ?s |
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| 1591. |
How are the resins regenerated after prolonged usage ? |
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Answer» Solution :After PROLONGED usage, PERMUTIT or RESINS lose their activity, and hence, are required to be activated. The exhausted zeolite is regenerated by treating with sodium CHLORIDE solution. `CaZ + 2NaCl to Na_(2)Z + CaCl_(2)` where Z is zeolite. |
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| 1592. |
How are Sol, solution and suspension differents each other. |
Answer» SOLUTION :
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| 1593. |
How are sol (colloidal), solution and suspension different from each other? |
Answer» SOLUTION :
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| 1594. |
How are nutrients present in our food absorbed by our body ? |
| Answer» Solution :The nutrients PRESENT in our food DISSOLVE in water which are then ABSORBED by the BODY. | |
| 1595. |
How are metals classified in the periodic table ? |
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Answer» Solution :METALS occupy a LARGER area in the PERIODIC table and are categorized as follows- (a) Alkali metals eg.-Sodium and Potassium (b) Alkaline earth metals eg.-Calcium and Magnesium (c) TRANSITION metals eg.-Iron and Nickel (d) Other metals eg.-Aluminium and Tin |
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| 1596. |
How are homogenous solution different from heterogeneous solution? Explain with examples. |
Answer» SOLUTION :
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| 1597. |
Assertion: Wet air is heavier than dry air. Reason: The density of the dry air is more than density of water. |
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| 1599. |
Helium is a noble gas with 2 electrons in its outermost shell. Its valency is 0. |
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| 1600. |
Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have ? |
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Answer» Solution :Mass NUMBER of helium is EQUAL to its atomic mass but has no units Mass numbr (a) ofhelium =4 No of protons in TE nucleus =2 Atomic numer (z) of the ELEMENT =2 No of neutrons (n) = A = -4 - 2 = 2 |
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