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.
| 551. |
Wrtie the reaction of sulphuric acid with sodium chloride and potassium nitrate. |
| Answer» SOLUTION :N/A | |
| 552. |
Zinc blende (ZnS) is an important ore of zinc . Whatis the amount of sulphur present in 24.35 g of pure zinc blende ( Zn=65.4 , S=32)? How many moles of Zn atoms are present in2.45xx10^(24) atoms of zinc ? |
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Answer» |
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| 553. |
Which among the following is a true solution ? |
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Answer» VINEGAR in water |
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| 554. |
What do you think would be the obser vation if the two particles scattering experiment is carried out using a foil of a metal other than gold ? |
| Answer» Solution :If particle scattering experiments is CARRIED out using a foil of any metal as thin as gold foil used by Rutherford, there WOULD be no change in OBSERVATIONS. But since other metals are not so malleable so, such a thin foil is difficult to obtain. If we use a thick foil, then more and particles would bounce back and no idea about the LOCATION of positive mass in the atom would be available with such a CERTAINITY. | |
| 555. |
Which is not a form of matter? |
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Answer» Solid |
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| 556. |
Which of the follwoing changes takes place during the process of calcination of an ore? |
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Answer» THERMAL decomposition of ore TAKES place |
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| 557. |
What is the ratio of radius of the 1^st orbit to 2^nd orbit, if the velocity of the electron in the 1^st orbit is twice that of the 2^nd orbit. |
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Answer» SOLUTION :(i) COMPARING the ANGULAR MOMENTUM of electron in the orbits composition of radius (iii) `r_1:r_2=1:4` |
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| 558. |
What is the principal of centrifugation ? Give its two applications. |
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Answer» Solution :The principle of centrifugation : When the solution is spun rapidly, the denser particles are FORCED to the BOTTOM and the lighter particles stay at the top. Application : (1) USED in diagnostic LABORATORIES for blood and urine TEST. (2) Used in dairies to separate butter from cream. |
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| 559. |
What are the chemical reactions of carbon? |
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Answer» Solution :Elemental carbon undergoes no reaction at room temperature and limited number of reactions at elevated temperatures. But its compounds undergo large number of reactions even at room temperature. Oxidation - (Reaction with oxygen) Carbon combines with oxygen to form its oxides like carbon monoxide (CO) and carbon dioxide `(CO_(2))` with evolution of heat. Organic carbon compounds like hydrocarbon also undergo oxidation to form oxides and steam with evolution of heat and FLAME. This is otherwise CALLED Burning. `2C_((s))+O_(2(g))to2CO_((g))+"heat"` `C_((s))+O_(2(g))toCO_((g))+"heat"` Reaction with steam Carbon REACTS with steam to form carbon monoxide and hydrogen. This mixture is called water gas. `C_((s))+H_(2)O_((g))toCO_((g))+H_(2(g))` Reaction with sulphur With sulphur carbon forms its DISULPHIDE at high temperature. `C_((s))+S_((g))toCS_(2(g))` Reaction with metals At elevated temperatures, carbon reacts with some metals like iron, tungsten, Titanium, etc. to form their carbides. `W_((s))+C_((g))toWC_((s))` |
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| 560. |
Which of the following is a universal solvent ? |
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Answer» Water |
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| 561. |
Where does it disappear? |
| Answer» Solution :The particles of SALT GET into the SPACE between the particles of WATER. | |
| 562. |
What is mendeleev's periodic law? |
| Answer» | |
| 563. |
X' is an alicylic hydrocarbon . with the moleclar formulaC_4H_8. Y is the corrcsponding aliphatic compound. Give all the possible isomers of y · and their IUPAC names. Identify the products of bro-mination. When Y is treated with hydrogen what are the products formed? How are these products separated from the nuxture? |
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Answer» SOLUTION :X is cyclobutane Y is butane Isomers of Y are (a)`underset (2-"Butane")(CH_3-CH=CH-CH_3)` `underset (1-"Butane")(CH_3-CH_2=CH=CH_3)` (a), (b) are position isomers.  (a) and (c)and (c) are CHAIN isomers. Therefore, the hydrogenated products aren-butane C in case (a), (b) and isobutene in case if (c):Among these two N-butane is having high boiling point than isobutane. The boiling point is PROPORTIONAL to surface area of the molecule, more is the surface area more are the intermolecular forces of attraction between the MOLECULES. So, its boiling point increases. Between n butane and isobutene n butane is having high surface areaso, boiling point is more when compared to isobutene. Hence, these two can be separated by fractional distillation. |
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| 564. |
Which of the following is the correct formulafor sodium phosphate ? Na_(3)PO_(4), Na(PO_(4))_(3),NaHPO_(4),Na_(2)(PO_(4))_(3) |
| Answer» SOLUTION :`Na_(3)PO_(4)` | |
| 565. |
Which of the following elements possesses 16 electrons and 16 neutrons? |
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Answer» `""_(16)^(16)`X A = p + N `therefore ` n = A - p = 32 - 16 = 16 |
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| 566. |
Which has more number of atoms 100 gms of Sodium or 100 grams of iron given atomic mass of Na = 234 , Fe = 564 |
| Answer» Solution :`{:("Sodium" ,, "IRON") , (100 XX 23 ,, 56 xx 100) , (2300 xx 6.023 xx 10^(23) ,, 5600 xx 6.023 xx 10^(23)):}` | |
| 567. |
State what you observe when a piece of moist blue litmus paper is placed in a gas jar of chlorine. |
| Answer» SOLUTION :TURNS RED and then GETS BLEACHED | |
| 568. |
What is an orbit ? |
| Answer» Solution :The path of an electron as it TRAVELS AROUND the NUCLEUS of an ATOM is CALLED the orbit. | |
| 569. |
What is symbol of an element ? |
| Answer» Solution :The abbreviation of the name of element by a letter or GROUP of two LETTERS is called the SYMBOL of an element. | |
| 570. |
What is the latent heat of vaporisation of water? |
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Answer» `2.25xx10^(6)Jkg^(-1)` |
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| 571. |
What is Isotone ? Give an example . |
Answer» SOLUTION :ATOMS of different elements with different atomic number and different MASS number, but with the same number of NEUTRONS are called isotones. Eg. Boron and carbon. 
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| 572. |
Which of the following gases can be separated completely form a mixture by using water as a solvent ? |
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Answer» `CO_2 and O_2 ` |
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| 573. |
What is the basis of the modern periodic table? |
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| 574. |
What is meant by dynamic equilibrium ? |
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| 576. |
What is the ratio of radii of the first successive odd orbits of hydrogen atom? |
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Answer» `9:1` Successive first ODD ORBITS are 1 and 3 `(r_1)/(r_3)=(0.529xx1^2)/(0.529xx3^2)=(1)/(2)=1:9` |
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| 577. |
What are the limitations of J.J. Thomson’s model of the atom? |
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Answer» Solution :Limitations of THOMSON's MODEL of an atom (i) It could not EXPLAIN the result of the scattering experiment performed by Rutherford . (ii) It did not have any experiminetal EVIDENCE in its support |
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| 578. |
Write the following equations and balance them : Potassium hydroxide + nitric acid to potassium nitrate + water |
| Answer» SOLUTION :`KOH+HNO_(3)toKNO_(3)+H_(2)O` | |
| 579. |
What is a catalyst? |
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Answer» |
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| 580. |
What is the use of fractional distillation ? |
| Answer» Solution :FRACTIONAL distillation is used to SEPARATE two or more miscible LIQUIDS. The difference in their boiling POINTS being less than 25 K. | |
| 581. |
Which one of the following will have the maximum charge/mass ratio. |
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Answer» Electron |
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| 582. |
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature. |
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Answer» SOLUTION :Mass of SODIUM chloride (solute) = 36 g Mass of water (solvent) = 100 g Mass of solution = Mass of solute + Mass of solvent = (36 + 100) g = 136 g Concentration of solution at 293 K = `("Mass of solute")/("Mass of solution")xx100` = `36/136xx100~~26.47%` The concentration of the solution at the GIVEN temperature is 26.47 %. |
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| 583. |
Write the chemical formulae of the following: (i) Magnesium phosphate (ii) Ammonium sulphate (iii) Sodium carbonate |
Answer» SOLUTION :
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| 584. |
Why are carbonated beverages kept in sealed containers ? |
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Answer» Solution :(i) CONSTITUENTS of carbonated beverages (ii) EFFECT of pressure on the solubility of a GAS in a LIQUID |
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| 585. |
When a mixture of these four liquids is taken, how can they be separated ? Justify. |
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Answer» Solution :(i) relation between vapour pressure and BOILING POINT (ii) METHODS of SEPARATION of LIQUIDS varyingin boiling points (iii) relation between vapour pressure and boiling point (iv) mehods of separation of liqudsvarying in boiling points |
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| 586. |
What is meant by electronie configurationof an element? |
| Answer» SOLUTION :The distribution of ELECTRONS in various orbits of an atom is CALLED the ELECTRONIC CONFIGURATION of an element. | |
| 587. |
Write the differences between elements and compounds and give an example for each. |
Answer» SOLUTION :
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| 588. |
Which of the following the is the molecular formula of dry ice? |
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Answer» `CO_(2(g))` |
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| 589. |
When carbon dioxide is passed through lime water, a milky white precipitate of ___________is formed. |
| Answer» SOLUTION :N/A | |
| 590. |
Which of the following changes takes place during the process of calcinationof ore ? |
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Answer» thermal decomposition of ore TAKES place |
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| 591. |
The two isotopes of carbon, C-12 and C-14, possess the same physical properties . |
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Answer» |
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| 592. |
What is a cation ? |
| Answer» SOLUTION :A CATION is a POSITIVELY CHARGED ION. | |
| 593. |
Which of the following is the correct order of matters arranged in the descinding order of their intermolecular attraction force? |
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Answer» WATER, AIR, wind |
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| 595. |
When water is cooled to a temperature x, it gets converted into ice at temperature x by a process called P. And when ice at temperature x is warmed, it gets reconverted into water at the same temperature x in a process called Q.(a)What is the value of temperature x in Kelvin ?(b) What is the process P known as ? (c) What is the name of energy released during process P ?(d)What is the process Q known as ?(e)What is the name of energy absorbed during process Q ? |
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| 596. |
There are three shells in the atom of element 'X', 6 electrons are present in its outermost shell. To which family of element does is this element belong to? |
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| 597. |
When a piece of metal is dropped in cold water, the water slowly becomes turbid and effervescence is observed. What will you observe, if blue litmus paper is dipped into the turbid water ? Indentify the metal and justify the observation. |
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Answer» Solution :(i) Indentification of metal that REACTS with cold water but does not produce any flame. (II) reaction between the metal and water. (iii) product formed in the above reaction. (iv) solubility of the product in water (v) NATURE of aqueous solution formed (vi) identification of changes observed when blue litmus PAPER is dipped in the above solution. |
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| 598. |
The removal of the top layers of the soil by wind is called |
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Answer» aeration |
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| 599. |
____________ metal is alloyed with gold and silver for making coins and jewels. |
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| 600. |
Which of the following conclusions were drawnfrom thealpha-rays scattering experiment? |
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Answer» The ATOM as a whole is positively CHARGED. |
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