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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.
| 651. |
Wrtie the reaction of phosphorous with chlorine. |
| Answer» SOLUTION :N/A | |
| 652. |
While studying the properties of cathode rays in a discharge tube a student placed mica wheel moundted on an axle in the path of the rays .What would happen to the wheel? What conclusions can be drawn from it? |
| Answer» Solution :The MICA wheel WOULD start rotating around the axle. This SHOWS that the cathode rays are made of MATERIAL particles (electrons). | |
| 653. |
Which of the two elements would be more reactive, element A of atomic number 36 or element B of atomic number 19 ? |
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Answer» SOLUTION :The electronic configurations of elements A and B are given below. `{:(A(36),2,8,18,8),(B(19),2,8,8,1):}` Since the outermost shell of element A is completely FILLED, it is stable and unreactive . The outermost shell of element B contains ONE electron only . Hence , it is more REACTIVE. |
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| 654. |
What are the micronutrients required by the plants ? |
| Answer» Solution :The MINERALS required by PLANTSIN very small AMUNT are called MICRONUTRIENTS. Hydrogn , oxygen , nitrogen, phosphorous and POTASSIUM are some example of micronutrients. | |
| 655. |
What are polyatomic molecules ? |
| Answer» Solution :MOLECULES CONTAINING more than FOUR atoms are called polyatomic molecules. | |
| 656. |
whenthesolid A isaddedto water, itdissolveswiththeevolutionof alotof heatand makinglittleexplosionsto fromtwoproducts B and C,The propertiesof productsB and Care entirely differentfrom thoseof solidA aswellas water,Moreover,ProductsB and Ccannotbereconvertedintosolid A andwater,whenanother solidD isaddedto water ,itdissolveswiththeabsorptionoflittle heatto forma product E whichcoolsdown ,Theproduct Esows thepropertiesof both, solid D aswater,Moreover, product E can beconverted intosolid D andwater . ( a)whattypeofchangeoccurswhensolid A isdissolvedin water? why? (b)whattypeof changeoccurswhen solid D isdissolvedin water? why(c )Namea metalwhichyou think couldbehavelike solidA .Also nametheproducts B and c . ( d)Namethesolid D ifti isthe onewhichis usedin makingordinary dry cells . ( e)namethe process by whichD canbe recoveredform E . |
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| 657. |
what arethe advantage of the classification of elements? |
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| 659. |
Under what conditions does coke react with water to form water gas? |
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Answer» SOLUTION :Steam is passed over red hot coke `(1000^(@)C)` `C+H_(2)Ooverset(1000^(@)C)to(CO+H_(2))-Delta` |
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| 660. |
What are the characteristics of dynamic equilibrium ? |
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| 661. |
What are polyatomic ions? |
| Answer» Solution :GROUP of atoms CARRYING CHARGE are known as polyatomic ions. | |
| 662. |
What produces more severe burns, boiling water or steam? OR Explain steam at 100^(@)C causes more severe burns than the water at the same temperature. |
| Answer» Solution :Steam at `100^(@)C` (or 373K) CONTAINS more heat ENERGY in the form of latent heat than boiling water. Due to this extra heat energy steam PRODUCES more severe BURNS than boiling water. | |
| 663. |
When the same isotopic gas is taken in two discharge tubes, the angle of deflection is found to be different though the strength of the external electric field applied is the same. Explain. |
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Answer» SOLUTION :(i)Factors which AFFECT angle of deflection in an electric field. (ii) Conditions for CHANGING the factors which affect the angle of deflection. |
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| 664. |
Write the following equations and balance them : Aluminium + sodium hydroxide + water to Sodium aluminate + hydrogen. |
| Answer» SOLUTION :`2Al+2NaOH+2H_(2)Oto2NaAlO_(2)+3H_(2)` | |
| 667. |
What are the limitations of Rutherford's model of the atom ? |
| Answer» Solution :According to Rutherford.s model of the atom, electrons revolve around the nucleus in circular PATH. Any particle in a circular orbit would undergo acceleration. The charged particle, during acceleration. would radiate energ The particle would lose energy and FALL into the nucleus. Thus the atom would be unstable. But we know that ATOMS are QUITE stable. | |
| 668. |
When we mix a drop of ink in water we get a ________ |
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Answer» Heterogeneous mixture |
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| 669. |
What is relationship between metallic character and the size of an atom? |
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| 670. |
Try segregating the things around you Mixture as pure substances or mixtures. |
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Answer» Solution :PURE substances : Water, SALT, sugar, ICE, gold, etc. MIXTURES : Air, milk, ink, soda, water, BUTTER, LPG, etc. |
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| 671. |
Which of the following has highest kinetic energy. |
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Answer» PARTICLE of ice at `0^(@)C` |
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| 672. |
The students of class 9 of City International school were attending an audio-visual session on the collinsion theory of chemical kinetics. When they were viewing the slides given below, their instructor asked them to guess which of the following could be the effective collision and justify their answer. |
Answer» Solution : The collisions REPRESENTED by FIGURE (a) are effective collisions. Thecollisions with threshold energy result in a reaction. APART from this, the reactants which collide should have a proper orientation. In figure (b), the nitrogen atom of NO is not near enough to make a bond with any of the near enough to make a bond with any of the oxygen atoms of ozone. In figure (a), the NO molecule collides with `O_(3)` where the direction in which both the reactants collide is PERFECT enough to result in a CHEMICAL reaction. |
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| 673. |
The smell of perfume spreads out by a process known as |
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Answer» evaporation |
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| 674. |
What is the valency of carbon in carbon monoxide? |
| Answer» SOLUTION :VALENCY of CARBON in carbon MONOXIDE is 2. | |
| 675. |
What is the mass of proton with respect to an electron ? |
| Answer» Solution :The MASS of proton is APPROXIMATELY 2000 TIMES that of an electron. | |
| 676. |
Yugaa wants to buy a plastic water bottle. She goes to the shop and sees four different kinds of plastic bottles with resin codes 1, 3, 5 and 7. Which one should she buy? Why? |
| Answer» SOLUTION :Yuga should by PLASTIC bottle with RESIN CODE 5, as it is considered to be more SAFER. | |
| 677. |
Which of the following would weigh the highest ? |
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Answer» 0.2 MOLES of sucrose `(C_(12)H_(22)O_(11))` |
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| 678. |
What are instantaneous reactions, slow reactions and moderate reactions ? Give examples. |
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| 679. |
Which of the following matters possesses definite volume but does not possess shape? |
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Answer» Oxygen |
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| 681. |
Which among the following pairs of elements have maximum and minimum electron affinity values respectively? |
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Answer» Be,CI |
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| 682. |
When 15g of copper sulphate react with 15 g of sodium hydroxide, 20g of sodium suphate along with copper hydroxide is formed .What is the mass of copper hydroxide formed? |
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Answer» Solution :The chemical reation TAKING place is: Copper sulphate + soldium hydroxide `RARR` sodium suphate + copper hydroxide (15G)(15g)(20g)(x) On the basis law of conservation of mass: Mass of copper hydroxide (x) =(15g +15g) -(20g) =10g |
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| 683. |
The temperatureat which a solid gets convertedinto liquid is called the |
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Answer» MELTINGPOINT of the solid |
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| 684. |
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass . |
| Answer» SOLUTION :ATOMIC theory provided an explanation for the LAW of conservation of mass | |
| 685. |
Which property of water is responsible for water pollution ? |
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Answer» high dielectric constant |
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| 686. |
Which of the following reactions does not take place in the smelting process? |
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Answer» `FeO+COtoFe+CO_2` |
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| 687. |
Write the symbol for the following elements : (i) gold (ii) mercury |
| Answer» Solution :(i) The SYMBOL of gold is AU (From AURUM). (ii) The symbol of MERCURY is Hg (From Hydrargyrum). | |
| 688. |
What was the basis of dobeereiner's classification of the elements ? |
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| 689. |
The symbol of these atoms are given below. 6C^12, 7N^14, 6C^14 Write any use of an isotope |
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| 690. |
The symbol of these atoms are given below. 6C^12, 7N^14, 6C^14 Which of these are isotopes? |
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| 691. |
Which group was the easiest to break? Why? |
| Answer» Solution :The third GROUP was easiest to BREAK. They were HOLDING each other with a very weak chain i.e. the ATTRACTION between each other was negligible. | |
| 692. |
Which of the following elements do not belong to group IIA or second group |
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Answer» Be,CI |
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| 693. |
Which of the following processes does (do) return oxygen to the atmosphere ? |
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Answer» OSMOSIS |
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| 694. |
What is the frequency of light emitted when an electron in a hydrogen atom jumps from the 3^(rd) orbit to the 2^nd orbit ? |
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Answer» SOLUTION :`E_3-E_2=-21.72xx10^(-19)((1)/(9)-(1)/(4))` `21.72xx10^(-19)XX(5)/(36)` `therefore` Difference in energy , `E_3-E_2-3.01xx10^(-19)J` According to Plank's eqution , `DeltaE=hv` `3.01xx10^(-19)=6.625 xx10^(-34)v` FREQUENCY, (v) `=(3.01xx13^(-19))/(6.625xx10^(-34))=4.5xx10^(14-1)s`. |
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| 695. |
What are the suitable conditions for the liquefaction of gas? |
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Answer» LOW TEMPERATURE and low pressure |
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| 696. |
Tow beakers A and B of equal mass contain 5 moles of methane (CH_(4)) and 5 moles of ammonia (NH_(3)) respectively . Which beaker will be heavier ? |
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| 697. |
What was the source of alpha particles in Rutherford scattering experiment? |
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| 698. |
What is the atomicity of (a) phosphorus (b) sulphur molecules ? |
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Answer» <P> SOLUTION :The atomicity of (a) phosphorus molecule is 4 `[P_(4)]` and that of (b) SULPHUR molecule is 8 `[S_(8)]`. |
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| 699. |
What is the correct procedure of mixing an acld and water? Why? |
| Answer» SOLUTION :One has to be cautious while mixing a concentrated inorganic acid with WATER. Always the acid must be added to water gently. While ADDING acid to water, one has to keep stirring the mixture simultaneously. Water should never be added to an acid as it generates huge amount of heat and the mixture can SPLASH out of the CONTAINER and cause harm to the person handling it, causing bums. | |
| 700. |
What is the reason for glowing the flourescent tube and neon sigh bulb? |
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Answer» PRESENCE of CHARGED particles |
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