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.
| 101. |
Which among the following reactions is reversible when carried out in a closed container ? |
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Answer» `3Fe+4H_(2)O to Fe_(3)O_(4)+4H_(2)` `CaCO_(3) hArr CaO+CO_(2)` |
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| 102. |
What are characteristics of the particles of matter ? |
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Answer» SOLUTION :The characteristics of particles of MATTER are : * Particles of matter have spaces between them. * Particles of matter are CONTINUOUSLY MOVING. * Particles of matter attract each other. |
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| 104. |
What is a suspecnsion? Give two characteristics of suspension? |
| Answer» SOLUTION :For answer CONSULT tedt PART (PAGE 68) | |
| 105. |
The chemical formula of aluminium chloride is AlCl_3. Write the valencies of Al and Cl. |
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Answer» |
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| 106. |
Which of the following factor(s) is (are) responsible for the change of state of solid carbon dioxide into vapours ? (a) Increase in pressure (b) Decrease in pressure (c ) Increase in temperature (d) Decrease in temperature. |
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Answer» (i) and (II) |
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| 107. |
Write the electronic configuration of K and CI |
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Answer» SOLUTION :Electronic configuration of `K^(+) - 2, 8 , 8 CI^(-) - 2 , 8 , 8` |
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| 108. |
While determininig the melting point of ice it was observed that even when ice cubes were being moderates heated using the gas burner the temperature did not rise for sometime till the whole ice melted. Give the possible reason. |
| Answer» Solution :Once the melting of ice starts upon heating with the helps of a gas burner the temperature becomes constatn till the entire ice melts tofor water in fact the heat ENERGY now absorbed is used up to OVERCOME the intermoleular foces or is used as latent heat of fusion .Terefore the temperature does not RISE .For more details CONSULT tedt PART (page 14) | |
| 110. |
What percentage of the earth's surface is covered by land ? |
| Answer» ANSWER :B | |
| 111. |
What are the characteristcs exhibited by a pure substance. |
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Answer» SOLUTION :1. A pure substance contains only one kind of ATOMS or molecules 2. It is perfectly homogenous 3. It has definite COMPOSITION which does not vary with TIME. 4. It has definite melting point, BOILING point, density etc. |
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| 112. |
Which of the following represent the suitable conditions for the liquefaction of gases ? |
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Answer» LOW TEMPERATURE, low pressure |
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| 113. |
The values of the second electron affinites of elelments are positive .which of the folloiwng could be the appropriate reason? |
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Answer» Work has to be DONE agianst the force of REPULSION of the valecne elctron of the uninegatve ion |
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| 114. |
Where are the extremely electropositve metals positioned in the periodic table? |
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| 115. |
There are three shells in the atom of element 'X', 6 electrons are present in its outermost shell. What is its atomic number? |
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Answer» |
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| 116. |
Which of the following triads do not follow Doberiner 's law of triads? |
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Answer» Li,Na,K |
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| 117. |
Which of the following properties of diamond is not attributed ot its rigid giant polymeric tetrahedral structure ? |
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Answer» good thermal conductivity |
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| 118. |
The sea water can be classified as a homogeneous as well as heterogeneous mixture. |
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Answer» Solution :Sea water is a MIXTURE of salts and water. Hence it is a HOMOGENEOUS mixture. Sea water also contains other impurities like MUD, decayed plants, etc. and so it is a HETEROGENEOUS mixture. |
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| 119. |
The solvent used to prepare colloidal solution is called ____ medium. |
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| 120. |
The solubility of copper sulphate is different in hot water and cold water. |
| Answer» SOLUTION :The solubility is a property RELATED to the temperature. As the temperature increases, the kinetic energy of the particles ALSO increases. So the solubility also increases. In hot WATER the kinetic energy of particles isless. HENCETHE solubility of copper sulphate is different in hot water and cold water. | |
| 121. |
Which group of elements belong to transition elements? |
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| 122. |
Write the main postulates of Bohr Bury scheme. |
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| 123. |
What is the colour of the precipitate formed when H_2Sis made to react with lead nitrate ? |
| Answer» SOLUTION :N/A | |
| 125. |
Why are some coal deposits associated with large amouns of sulphur ? |
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Answer» Solution :(i) COMPOSITION of submerged plants (II) PROCESS of DECAY of submerged plants (iii) CHANGES that take place in submerged plants |
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| 126. |
Whatis the basic difference between mendelev's periodic table and the modern periodic table |
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| 127. |
What is the space between the particles of a matter called ? |
| Answer» SOLUTION :Intermolecularspace | |
| 128. |
What is Chemotherapy? |
| Answer» Solution :Treatment of certain DISEASES by destroying the INVADING organism without damaging the CELLS of HOST, by the use of certain organic compounds is known as Chemotherapy. | |
| 129. |
Which one of the following is a correct electronic configuration of sodium ? |
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Answer» `2.8` |
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| 130. |
While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56^(@)). What technique can be employed to get back the acetone? Justify your choice. |
| Answer» SOLUTION :Acetone can be recovered by carrying out the distillation is a distillation flask. Its vapours will rise SINCE it is volatile, get condensed and COLLECTED in a RECEIVER. Salt being non-volatile in nature remains in the flask. | |
| 132. |
What do you observe : Hydrochloric acid is added to lead nitrate solution. |
| Answer» SOLUTION :White PPT of `PbCl_(2)` is formed. | |
| 133. |
Write with electronic configurartion of the most stable cation of the fourth period element which has lowest ionisation potential value justify your answer |
| Answer» Solution :The element belonging to GROUP IAAor 1 have the least IONISATION potential VALUE in a period SINCE it has only one valene electron the monopositive cation is the most stable cation .The element belongs fourth period hence the electronic configuration of the cation is 2,8,8. | |
| 134. |
Water regulates body temperature through ................. |
| Answer» SOLUTION :SWEATING ( or prespiration ), EVAPORATION | |
| 135. |
Why are Dolton's symbol not used in chemistry? |
| Answer» Solution :Dolton was the FIRST SCIENTIST to use the symbol for the name of the ELEMENTS of SPECIFIC sense but it was difficult to memorize and use. So Dalton.s symbols are not used in chemistry. | |
| 138. |
When glass of water is freezed, formation of ice starts from the top layer but melting of ice starts from the bottom. Justify. |
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Answer» SOLUTION :(i) movement of water when water undergoes freezing (II) EFFECT of PRESSURE on the MELTING point of ice |
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| 140. |
Try Segregating the things aroundyou as pure substancesor Mixtures . |
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Answer» Solution : Pure Substances :GOLD , SUGAR, Rice , WATER MixturesSubstances :Air, Stainless Steel , PLASTIC , Milk |
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| 141. |
What is the compositions of petrolum gas ? Why is it used as a domestic fuel ? |
| Answer» Solution :Petrolum gas CONTAINS HYDROCARBONS with 1-4 carbons atoms. It is USED as a domestic fuel DUE to its high calorific value and also beacause of its liquafaction . | |
| 142. |
Which of the following pairs belong to the same homologous series ? |
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Answer» `C_3H_4,C_5H_(10)` |
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| 145. |
What is the full form of PNG? |
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Answer» PETROL NATURAL GAS |
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| 146. |
Two students Rishi and Khushi were prepatring for International Chemistry Olympiad.They had come across a question .In that,a table of boiling point of members of hmuologous series of alkanes was given and also. Predict the trend observed. What reason can be attributed to the above trend? |
| Answer» Solution :The VAN der Waal's forces which HOLD the non ALKANE molecules are weak and have a very short range. The larger the molecule, the stronger are the intermo lecular forces. Since boiling point depends upon the intermolecular forces, the boiling points of alkanes increase With increase in chain length. Also as the molecular weight increases, the velocity of the molecule decreases at a particular temperature. Thus, alkanes tend to be in a LIQUID or a solid state. | |
| 148. |
The units of rate of reaction are _____. |
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| 149. |
What are effective collisions ? |
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| 150. |
Write the chemical formulae of the following: a) Magnesium chloride b) Copper nitrate c) Calcium oxide d) Aluminium chloride e) Calcium carbonate |
| Answer» Solution :`{:((a),"MAGNESIUM chloride ",-MgCl_(2)),((b),"CALCIUM oxide",-CaO),((c),"Copper nitrate",-CaO),((d),"Aluminim Chloride",-Cu(NO_(3))_(2)),((E),"Calcium Carbonate",-CaCO_(3)):}` | |