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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.
| 6601. |
Define Relative atomic mass. |
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Answer» Solution :Relative ATOMIC MASS of an element is the ratio between the average mass of its isotopes to `1//12^("th")` PART of the mass of a CARBON - 12 atom. It is denoted as `A_(r)`. `"Relative atomic mass"=("Average mass of the isotopes of the element")/(1//12^("th")" of the mass of ONE Carbon - 12 atom")` |
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| 6602. |
Define refractive index of a transparent medium. What is its unit? Which has a higher refractive index glass or water? The radius of curvature of a spherical mirror is 20 cm. What is its focal length |
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Answer» Solution :The ratio of the speed of light in the FREE space (c) to the speed of light in given medium (V) is CALLED its refractive index. `n = C/V It has no unit, glass has more refractive index than water. Radius of CURVATURE, R = 20CM Radius of curvature of a spherical mirror = 2 x Focal length (f) `R = 2T` `t.= R/2 = 20/2 = 10 cm` Hence, the focal length of the given spherical mirror is 10 cm. |
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| 6603. |
Define rate of reaction. |
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Answer» Solution :"Rateof a REACTIONIS thechangein theamountor concentrationof anyone of thereactants orproducts perunittime ". `A to B ` The rateof THISREACTIONIS GIVENBY `"Rate "=-(d[A])/(DT)=+(d[B])/(dt)` Where. [A] - concentrationof A [B]- concentrationof B |
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| 6604. |
Define rate of a chemical reaction. |
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Answer» Solution :The rate of a chemical reaction is defined as the CHANGE in concentration of anyone of the REACTANTS or product per unit TIME. `Rate=-(d[A])/(dt)` |
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| 6605. |
Define rancidity. To prevent rancidity of food containing oils and fats, some substances are added to them. What are these substances called ? some other methods to prevent rancidity. |
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Answer» Solution :Rancidity is the slow process where the oils and fats present in food are oxidized when exposed to oxygen, LEADING to foul SMELL and a BAD taste. Different methods used to prevent rancidity are : (a) Adding chemical called antioxidants, which prevent or slow down the oxidation process. (B) Storing foods in airtight containers or in a REFRIGERATOR. |
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| 6606. |
Define rancidity. |
| Answer» Solution :The oxidation of OILS or FATS in food resulting in a bad taste and SMELL is CALLED RANCIDITY. | |
| 6607. |
Define Rancidity ? |
| Answer» SOLUTION :The oxidation of oils or FATS in food resulting in a bad smell and bad TASTE is called RANCIDITY, | |
| 6608. |
Define pH scale. Draw a figure showing variation of pH with the changes in concentration of H^+(aq) and OH^(-) (aq) ions. (ii) Mention the range of pHof acidic solution and neutral solution respectively. |
Answer» Solution :(i) Scale for MEASURING `[H^+]` concentration in a solution is called pH scale.  (II) pH of neutral solution is 7 pH of acidic solution is 0 to below 7 pH of BASIC solution is 7 to 14. |
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| 6609. |
Define pH . |
| Answer» SOLUTION :The PHIS thenegativelogarithmof THEHYDROGEN ionconcentrationin a solution. | |
| 6610. |
Define periodicity. |
| Answer» Solution :The repetition of PROPERTIES of the elementsin REGULAR INTERVALS is called periodicity. | |
| 6611. |
Define: Periodic properties |
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Answer» Solution :Properties of the ELEMENTS which are periodic function of their electronic configuration and are repeated after definite INTERVAL of atomic numbers. OR Properties which show the regular gradation in the same group (moving from top to bottom) or along a period (moving from left to right) are known as periodic properties. |
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| 6612. |
Define : Oxidising agent |
| Answer» Solution :Some SUBSTANCES are CAPABLE of adding oxygen to other substances. These substances are known as oxidising agents. | |
| 6613. |
Define oxidation and reduction. |
| Answer» Solution :OXIDATION is addition of OXYGEN or REMOVAL of hydrogen. REDUCTION is addition of hydrogen or removal of oxygen. | |
| 6614. |
Define Ore |
| Answer» Solution : A MINERAL containing high percentage of a PARTICULAR metal and from which metal can be profitably EXTRACTED is called an ore. | |
| 6615. |
Define one volt (IV) potential difference. |
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Answer» Solution :One VOLT is the potential difference between two POINTS in a current carrying CONDUCTOR when 1 JOULE of work is done to move a charge of 1 Coulomb from one point to the other. ` therefore ` Therefore 1 volt ` = (" 1 joule ")/("1 Coulomb") =1 JC^(-1)` |
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| 6616. |
Define olfactory indicators. Name two substance which can be used as olfactory indicators. (b) Choose strong acids from the following CH_(3)COOH, H_(2)SO_(4),H_(2)CO_(3),HNO_(3) |
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Answer» Solution :Indicators which work on the basis of odour are CALLED olfactory indicators. ONION and vanilla can be USED as olfactory indicators. (b) `H_(2)SO_(4)` and `HNO_(3)` are strong acids out of the FOUR acids given. |
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| 6617. |
Define olfactory indicators. |
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Answer» Solution :Those SUBSTANCE whose smell (ODOUR) changes in acid or basic solution are called OLFACTORY indicators. Example : (i) Onion (II) Vanilla |
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| 6618. |
Define molecule. |
| Answer» SOLUTION :A MOLECULE is a combination of TWO or more atoms held together by STRONG CHEMICAL force of attraction. i.e. Chemical bonds. | |
| 6619. |
Define Mole. |
| Answer» Solution :The MOLE is the AMOUNT of the substance that CONTAINS as many elementary entities as there are ATOMS in exactly 12 g of carbon-12 isotope. | |
| 6620. |
Definemole . |
| Answer» Solution :MOLE(MOL )is THEAMOUNT ofa substancethatcontainsas manyelementaryentitiesas therearein exactly12gof thecarbon- 12 isotope. | |
| 6621. |
Define Modern periodic table . |
| Answer» Solution :" The PHYSICAL and chemical PROPERTIESOF the elementsare the periodicfunctions of theiratomic NUMBER" . | |
| 6622. |
Define - metallurgy. |
| Answer» Solution : The various STEPS invloved in the extraction of METALS from their ORES as well as REFINING of CRUDE metals are collectively known as metallurgy . | |
| 6623. |
Define : Metalloids (Semi-metal) |
| Answer» SOLUTION :Elements which POSSESS intermediate PROPERTIES of both metals and non-metals are called metalloids or semi-metals. | |
| 6624. |
Define metallurgy . |
| Answer» SOLUTION :METALLURGY is a scienceof extractingmetalsfromtheirores and modifying the metals into alloys for various uses , BASEDON physical and chemical propertiesand their STRUCTURAL ARRANGEMENT ofatoms . | |
| 6625. |
Definemetallic radius. |
| Answer» SOLUTION :It isdefined as HALF the DISTANCE between NUCLEI of ADJACENT metalatoms . | |
| 6626. |
Define 'melting point' of a substance ? What is the melting point of ice ? |
| Answer» Solution :The SPECIFIC temperature at which a solid GETS converted into LIQUID is called the melting POINT of the solid. | |
| 6627. |
Define Mass percentage. |
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Answer» Solution :Mass percentage of a solution is DEFINED as the percentage by mass of the SOLUTE PRESENT in the solution. Mass percentage `=(" Mass of the solute")/("Mass of the solution")xx100` |
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| 6628. |
Definemasspercentage. |
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Answer» Solution :Mass PERCENTAGE of asolutionisdefinedas thepercentagebymass of thesolutecontainedin THESOLUTION . Masspercentage`=("MASSOF thesolute")/("Massof thesolvent" ) XX 100` |
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| 6629. |
Define : Isotopes |
| Answer» SOLUTION :Atoms of the same ELEMENT having same ATOMIC number but DIFFERENT atomic masses are KNOWN as isotopes. | |
| 6630. |
Define isomerism. Give suitable example. |
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Answer» Solution :The PHENOMENON by which two or more compounds have same molecular formula but differ structural formula with difference in properties is KNOWN as ISOMERISM. `C_(2)H_(6)O`. This molecular formula has two ISOMERIC structure. (i) `C_(2)H_(5)OH` - Ethyl alcohol (ii) `CH_(3)-O-CH_(3)` - Dimethyl ether |
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| 6631. |
Define ionisation energy or Ionisation enthalpy . |
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Answer» SOLUTION :IONISATION ENERGY is the minimum energy required to removean electron from a gaseous atom in its ground state to form a cation . It is OTHERWISE calledionisation enthalpy . `A_((g))+"Energy" to A_((g))+e^(-)`( FIRST ionisation energy , `IE_1` ) |
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| 6632. |
Define Ionisation energy |
| Answer» Solution : onisation ENERGY is the MINIMUM energy required to remove an electron from a GASEOUS ATOM in its ground STATE to form a cation | |
| 6633. |
Define ionic compounds. Ionic compounds conduct electricity only in the molten state and not in solid state. Why ? |
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Answer» SOLUTION :The compound formed by the transfer of electrons from a METAL to a non-metal are CALLED ionic compounds. Ionic compounds in the solid state do not conduct electricity because movement of IONS in the solid is not possible due to their rigid structure, but in the molten state ions MOVE freely. |
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| 6634. |
Define (i) mineral (ii) ore. Aluminium occurs in combined state whereas gold is found in free state in nature. Why ? |
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Answer» Solution :The elements or compounds which OCCUR naturally in the earth.s crust are known as MINERALS. The minerals from which a particular metal can be profitable EXTRACTED is called ore. Gold is very less reactive whereas aluminium is a more reactive element. Therefore, aluminium reacts with other elements or compounds more than gold. Thus, aluminium occurs in COMBINED state while gold occurs in free state. |
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| 6635. |
Define (i) Atomic number (ii) Mass number |
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Answer» Solution :(i) Atomic number of an element is the number of protons or number of NEUTRONS and ELECTRONS present in it. (ii) Mass number is the SUM of the number of protons and neutrons in an ATOM. |
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| 6636. |
Define : Hydrocarbons |
| Answer» SOLUTION :The compounds containing CARBON and HYDROGEN only are called HYDROCARBONS. | |
| 6637. |
Define Hydrated salt. |
| Answer» Solution :The number of WATER MOLECULES FOUND in the CRYSTALLINE substance or salts is called water of crystallization. Such salts are called hydrated salts | |
| 6638. |
Define : Homologous series |
| Answer» Solution :A SERIES of organic COMPOUNDS in SUCCESSION which differ by a definite group (like `-CH_(2)-`) is CALLED homologous series. | |
| 6639. |
Defineheterocycliccompounds . Give an example . |
Answer» SOLUTION :If the chain CONTAINS carbon and otheratoms LIKE oxygen , nitrogen, sulphur , etc. , these compounds are calledheterocycliccompounds.
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| 6640. |
Define Henry's law. |
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Answer» Solution :To quantify the solute in a solution, we can USE the term CONCENTRATION. Concentration of a solution may be defined as the AMOUNT of solute present in a given amount of solution or solvent. (or) The solubility of a gas in a liquid is directly PROPORTIONAL to the pressure of the gas over the solution at a definite TEMPERATURE. |
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| 6641. |
Define group and period with reference to the Modern Periodic Table. |
| Answer» Solution :Group is the vertical COLUMN of elements and PERIOD is the horizontal ROWS of elements in the MODERN PERIODIC Table. | |
| 6642. |
Define groups. |
| Answer» Solution :The VERTICAL COLUMNS in the long FORM of the PERIODIC Table are called GROUPS. | |
| 6643. |
Define Gibbs Energy. Give its mathematical expression. What is Gibb's energy criteria of Spontaneity. |
| Answer» SOLUTION :`Delta_(R ) G^(theta) = + 0.16 KJ` | |
| 6644. |
Define genetics what is the contribution of Mendel in the field of genetics? |
| Answer» Solution :The branch of biology that deals with the study of heredity and variation is CALLED genetics Gregor Johann Mendel was the FIRST person to carry out experiment regarding the heredity of certain characters trom one generation to another in a scientific manner. He worked mainly on the garden pea plant. His observations regarding the occurance of contrasting characters in VARIOUS generations of garden pea led him to interpret that these are eontrolled by units which he called FACTORS. These factors are today know as genes. He is also know as the FATHER of genetics.. | |
| 6645. |
Define galvanishing. |
| Answer» Solution :It is a processs of GIVING a THIN COATING of zinc or iron or STEEL to protect it from CORROSION. | |
| 6646. |
Define : Functional group |
| Answer» SOLUTION :An atom or a group of ATOMS which IMPARTS SPECIFIC properties to the compound is called a functional group. | |
| 6647. |
Define : Esterification reaction |
| Answer» SOLUTION : A REACTION in which a carboxylic ACID and an alcohol REACT in the presence of acid catalyst FORMING esters and water is known as an esterification reaction. | |
| 6648. |
DefineElectrovalent compounds |
| Answer» Solution : The COMPOUNDS FORMED by the transfer of electrons from a metal to a non-metal are KNOWN as electrovalent compounds. They are IONIC compounds. | |
| 6649. |
Define electroplating and write its main purpose . |
| Answer» Solution :ELECTROPLATING is a process in which a fine and SMOOTH layer of ONE METAL is deposited on the surface of another metal object . Electroplating is done for decoration as well as protection of an object . | |
| 6650. |
Define electropositivity. |
| Answer» Solution :Tendencyof metals to LOSE ELECTRONS is CALLED electropositivity. | |