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.
| 501. |
Which of the following is a compound ? |
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Answer» Air |
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| 502. |
Which among the following is true ? |
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Answer» Air is a bad conductor of heat and THERMAL expansion of solids is more than that of GASES. In cases of solid, themolecules are closelypacked and theintermolecularforce of attraction are maximum .Therefore, on heating the molecules cannotmove freelythereby showigless expansion thangeses inwhich the forece of attraction betweenmolecules is less, andhence, on heating KE of molecules increses, andtherefore, the volumeincreases. |
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| 503. |
Which postulate of Dalton's atomic theory can explain the law of definiate proportions ? |
| Answer» SOLUTION :DALTONS atomic theory GAVE explanation for the law of definite PROPORTIONS . | |
| 504. |
The two elements A and B have the same atomi mass but their atomic numbers are 19 and 20 respectively . A and B are |
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Answer» isotopes |
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| 506. |
Which scientist proposed the law of electrolysis? |
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Answer» JOHN Dalton |
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| 507. |
What is humidity? |
| Answer» Solution :The concentration of WATER VAPOUR in the ATMOSPHERE is called HUMIDITY. | |
| 508. |
Write your observations when dilute sulphuric acid is added to the following: A metal carbonate (sodium carbonate). |
| Answer» Solution :A colourless, odourless gas is evolved with BRISK EFFERVESCENCE, the gas turns LIME water MILKY. | |
| 509. |
The valency of an element A is 3 and that of another element B is 2 . The formula of the compound formed from A and B is …………. |
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Answer» |
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| 510. |
The table given below shows number of grams of five different solids dissolving in 100 g of the solvents : water, alcohol and chloroform (all at 20^(@)C). {:("Solvent","Salt","Sugar","Iodine","Chalk","Urea"),("Water",36.0,204.0,0.6,0.0,100.0),("Alcohol",0.0,0.0,20.0,0.0,16.0),("Chloroform",0.0,0.0,3.0,0.0,0.0):}(a) Which solid dissolves best in water at 20^(@)C ?(b) Which solid is maximum soluble in alcohol ?(c ) Which solid is insoluble in all the three solvents ? |
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Answer» Solution :(a) Sugar is best SOLUBLE in water at `20^(@)C` (b) IODINE is maximum soluble in alcohol. (c ) CHALK is insoluble in all the three SOLVENTS. |
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| 511. |
Which one of the following sets of phenomena would increases on raising the temperature ? |
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Answer» Diffusion, evaporation, compression of GASES |
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| 512. |
Which of the following is an identification test for unsaturation in an organic compound ? |
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Answer» ADDITION in an organic compound ? |
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| 513. |
What is an anion ? |
| Answer» SOLUTION :An ANION is a NEGATIVELY CHARGED ION. | |
| 514. |
You are given a mixture of sand, water and mustard oil. How will you separate the components of this mixture ? Explain with the help of different separation methods involved in it. |
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Answer» Solution :The separation of the components from this heterogeneous mixture can be done in the following steps. Step I. Filter the mixture through a glass funnel. For the details of the process, Water and mustard will be collected as filtrate while SAND PARTICLES will remain on the filter paper as residue. Step II. Now transfer the mixture of water and mustard oil to a SEPARATING funnel and proceed as discussed in section. Water will form the LOWER layer in the funnel while mustard oil the upper layer. Separate the TWO layers. |
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| 515. |
The valency of iron (Fe) is 3 and oxygen (0) is 2. Write the chemical formula of iron oxide |
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Answer» |
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| 516. |
Which element is next to lanthanum with atomic number 57 of group 6 in the periodic table? |
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Answer» |
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| 517. |
What is meant by peiodicity ? What are the various periodic properties ? Explain how and why atomic radius varies in a group period given an example |
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| 518. |
X and Y are the elements which belong to VI A, VII A group or 3rd period. Oxide of an element 'X' and element 'Y' act as a bleaching agents in the presence of water. Explain bleaching action of which one is permanent. |
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Answer» SOLUTION :(i) identification of X and Y (ii)identification ofoxide of X. (iii) COMPARISON of process of bleaching by Y and that by oxide of X. (IV) comparison of NATURE of products (v) effect of atmospheric oxygen on the products |
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| 519. |
What is meant by activation energy ? |
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| 520. |
What is IUPAC ? Where is it located ? Give examples of few elements named by IUPAC. |
| Answer» Solution :IUPAC stands for-The International Union of Pure and Applied Chemistry. It is an international ORGANIZATION that represents Chemists from VARIOUS COUNTRIES. IUPAC is REGISTERED in Zurich, Switzerland and has its secretarate in UNITED States. | |
| 521. |
What change is observed in a matter of substance with rise in temperature? |
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Answer» WEIGHT decreases |
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| 523. |
The temperature-time graph below shows the heating curve for pure wax. From the graph answer the following : (a) What is the physical state of the substance at the points A, B, C and D ? (b) What is the melting point of the substance ? (c ) What is its boiling point ? (d) Which portions of the graph indicates that change of state is taking place. (e ) Name the terms used for heat absorbed during change of states involved in above processes. |
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Answer» Solution :(a) At point A : Wax is in the solid state. At point B : Wax has started melting and exists both in the solid as well as liquid states. A point C : Wax is in liquid state. At point D : Wax has stared boiling. Therefore, it exists both in the liquid as well as gaseous states. (b) Melting point of wax = `15^(@)C` (c ) Boiling point of wax `= 110^(@)C` (d) The change of state (solid to liquid) is REPRESENTED by the PORTION `A_(1) " to " B_(2)` (straight line). The change of state (liquid to gas ) is represented by the portion `D_(1) " to " D_(2)` (straight line). (e ) It is known as latent heat of fusion in case of solids and latent heat of vaporisation in case of liquids. |
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| 524. |
Which of the following is not a transition element? |
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Answer» Mn |
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| 525. |
What is the ratio of distance between successive orbits of1 and 2 to 2 and 3 of hydrogen atom ? |
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Answer» Solution :(i) effects of high voltage and low pressure on the gas molecles in the discharge TUBE. (ii) the EFFECT of velocity of ELECTRONS on ionisation (iii) relation between the voltage and the velocity of electrons. (iv) relation between the pressure and the NUMBER of gas molecules. (v) the effect of the number of gas molecules on the impact of COLISION. |
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| 526. |
There are four substance W, X, Y and Z. The substance W is a dark violetsolid having diatomic molecules.A solution of W in alcohol is used as a common antiseptic C. The susbstance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.(a) Name (i) W (ii)X (iii)Y and (iv) Z.(b) Out of W, X, Y and Z, which substance/substances can undergo sublimation ?(c ) Which substance is organic in nature ? (d)what is the name of substance C ?(e) Which substance belongs to the halogen family ? |
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Answer» |
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| 527. |
This type of food protect us from deficiency diseases. |
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Answer» CARBOHYDRATES |
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| 528. |
What is ratio of the amount of energy required to remove an electron from hydrogen and He^(+)ion ? |
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Answer» Solution :ENERGY of electron (single electron species) `E_n=-(13.6xxZ^2)/(n^2)EV`, For hydrogen `rArr-13.6xx(1^1)/(1^2)=-13.6eV`, Energy REQUIRED to remove this electron `=+13.6eV` For `He^(+)rArr-13.6xx(2^2)/(1^2)=-54.4eV`, Energy required to remove this electron `=+54.4eV` Ratio of energy required `=(13.6)/(54.4)=(1)/(4)=1:4`. |
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| 529. |
Why are Noble gases inert in nature? |
| Answer» Solution :Noble GAS are inert in nature due to the completely filled SUBSHELLS and thus have stable electronic structures which is very DIFFICULT to CHANGE. The elements Helium. Neon, Argon, Krypton, Xenon and Radon of group 18 in the periodic table are Noble gases. | |
| 530. |
Write electron structure of following atoms on the basis of Bohr's model : ""_(10)Ne, ""_(12) Mg, ""_(15)P, ""_(17)Cl, " "_(20)Ca |
Answer» SOLUTION :FOLLOWING are the ATOMIC STRUCTURES of the glven ATOMS:
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| 531. |
Which of the following reactionstakes place in the lower region of a blast furnace ? |
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Answer» `CO_2+Cto2CO-39 kcal` `C+O_2toCo_2+97kcal` |
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| 532. |
What ismeant by Substance ? |
| Answer» Solution :It is a MIXTURE of more than ONE KIND of PURE of MATTER | |
| 535. |
Which of the following molecular formulae represence a saturated hydrocarbon ? |
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Answer» `C_4H_4,C_5 H_(10)` |
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| 536. |
Write down the names of compounds represented by the following formulae : 1. Al_(2)(SO_(4))_(3) 2. CaCl_(2) 3. K_(2)SO_(4) 4. KNO_(3) 5. CaCO_(3) |
Answer» SOLUTION :
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| 537. |
What are canal rays ? |
| Answer» SOLUTION :Canal rays are POSITIVELY charged RADIATIONS that can PASS through perforated cathode plate. These rays consist of positively charged particles KNOWN as protons. | |
| 538. |
What is a Tyndall effect ? |
| Answer» Solution :The scattering of beam of LIGHT by colloidal PARTICLES is KNOWN as TYNDALL effect. | |
| 539. |
Which seperation techniqueswill you apply for the Seperation of theTea leaves from tea? |
| Answer» SOLUTION :FILTRATION | |
| 540. |
What do you understand by valence electrons ? |
| Answer» SOLUTION :The electrons PRESENT in the outermost SHELL of an ATOM are knowm as VALENCE electrons. | |
| 541. |
Which of the following are matter? Chair, air,love, smell, hate, atmonds, thought, cold, lemon water, smell of perfume. |
| Answer» Solution :CHAIR, air, SMELL, almonds, cold drink, and smell of PERFUME are matter (because they occupy SPACE and have mass). It should be NOTED that 'smell' is a matter because it is due to the presence of some volatile substance in air which occupy space and have mass. | |
| 543. |
When potassium permanganate was diluted its color faded what can we conclude from it? |
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Answer» PARTICLE SIZE is small |
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| 544. |
Which seperation techniqueswill you apply for the Seperation of the Iron Pins from Sand? |
| Answer» SOLUTION :MagneticSeperation | |
| 545. |
The valency of carbon in CH_(4), C_(2)H_(6), C_(2)H_(4) and C_(2)H_(2) is ........, …........, …......., and …....... respectively. |
| Answer» SOLUTION :4, 3, 2, 1 | |
| 546. |
Which of the following electronic configurations represents the atom of aluminium ? |
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Answer» 2,8,2 |
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| 547. |
What are alkali metals ? |
| Answer» SOLUTION :The elements of group 1 (EXCEPT HYDROGEN) are metals. They react with WATER to form solutions that are highly alkaline or basic. Hence they are called ALKALI metals. | |
| 548. |
What is meant by allotropy? |
| Answer» SOLUTION :N/A | |
| 549. |
What are polyatomic ions ? Give examples . |
| Answer» SOLUTION :A polyatomic ion is a GROUP of atoms carrying a charge (POSITIVE or negative) EX: Nitrate (NO.), hýdroxide ion (OH) | |
| 550. |
Why are we able to sip hot tea or milk falster from a saucer rather than a cup? |
| Answer» Solution :HOT tea or milk in a saucer has larger surface area as compared to cup. Thus RATE of evaporation is faster, if the surface area isincreased. The hottea in saucer COOLS sooner than in a cup and we are able to sip hot tea faster from a saucer rather than a cup. | |