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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.
| 1. |
Thermal exparision of solids is the least among the three states of matter due toA. high kinetic energy of molecules of solids.B. close packing of molecules solids.C. the vibratory motion and rotatory motion of molecules of solids.D. the large intermolecular space present in solids. |
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Answer» Correct Answer - B In solid the molecules are closely packed due to strong forces of attraction and hance thermal expansion of solid is least among the three state states of matter. |
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| 2. |
Identify the wrong statement among the following.A. Molecules of solids prossesss only vibratory motion.B. Solids are incompressible.C. Solids have only one free surface.D. Gases are highly diffusible. |
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Answer» Correct Answer - C Solids have many free surfaces because the molecules have only vibratory motion and hance are fixed. |
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| 3. |
_________ and _________ are the suitable separation methods for mixtures of soluble solids in liquids. |
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Answer» Correct Answer - Evaporation, distillation Evaporation, distillation To separate soluble solids from a liquid the method of evaporation and distillation are suitable. |
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| 4. |
Separation of sawdust from water, can be carried out by the following steps given below. Arrange them in a proper sequence. (a) The mixture is poured gently in to the filter cone and collected into another beaker which is called filtrate. (b) A mixture of saw dust and water is taken in a beaker (c ) A filter paper is folded in the form of a cone and fitted into a funnel by moistening it with few drops of water (d) solid retained on the filter paper is called residue.A. cabdB. abcdC. cdbaD. bcad |
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Answer» Correct Answer - D (i) A mixture of saw dust and water is taken is taken in a beaker (ii) A filter paper is folded in the form of a cone and fitted into a funnel by moistening it with few drops of water (iii) The mixture is poured gently in to the filter cone and collected into another beaker which is called filtrate. (iv) solid retained on the filter paper is called residue. |
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| 5. |
For the separation of the components of a mixture of iodine, iron filings and sawdust arrange processes in sequential order. (a) The mixture is covered with an inverted funnel. The outside surface of the funnel is wrapped with a moist filter paper and the mixture is gently heated. Iodine is separated. (b) A strong bar magnet is moved through the mixture. The iron filing are separated. (c ) I Sawdust is left after iodine separates. The mixture is exposed to wind to remove sawdust.A. b,a,cB. d,b,aC. d,c,aD. a,d,c |
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Answer» Correct Answer - A b,a,c (i) A strong bar magnet is moved through the mixture. The iron filings are separated (ii) The mixture is covered with an inverted funnel. The outside surface the funnel is wrapped with a moist filter paper and the mixture is gently. Heated. Is separated. (iii) Sawdust is left after iodine separates. |
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| 6. |
A mixture contains three components namely glucone-D, water and sand. These three can be collected separately byA. filtration and evaporationB. filtration and sublimation.C. filtration and distillation.D. sedimentation and decantation. |
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Answer» Correct Answer - C Sand is insoluble in water , it can be separated by filtration. Gluocone-D is soluble in water , can be seprated by distillation and water is collected separately. |
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| 7. |
`{:(,"Column-A",,,"Column-B"),((A),"Sublimation",(),(a),NaCl+"water"),((B),"Filtration",(),(b),"Iodine+sand"),((C),"Evaporation",(),(c),"Sawdust+water"):}`A. `Atoa" "Btoc" "Ctob`B. `Atoc" "Btoa" "Ctob`C. `Atoc" "Btob" "Ctoa`D. `Atob" "Btoc" "Ctoa` |
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Answer» Correct Answer - D Sublimation `to` Iodine + sand, iodine undergo sublimation on heating Filtration `to` Sawdust+water, sawdust floats on water Evaporation `to` NaCl+water, NaCl is soluble in water and undergose evaporation on heating |
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| 8. |
Which among the following has strong forces of attraction ?A. Hydrogen chlorideB. BromineC. FluorineD. Chlorine |
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Answer» Correct Answer - B Bromine is a liquid and hence it possesses stronger intermolecular forces of attractions than gases. |
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| 9. |
Which among the following pairs of substances has strong intermolecular forces of attraction ?A. Bromine, mercuryB. Gallium, bromineC. Bromine, sodiumD. Carbon, potassium |
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Answer» Correct Answer - D Solids have strong intermolecular forces of attraction and hence carbon, potassium possess strong forces of attraction. |
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| 10. |
Which among the following is a pure substance ?A. Dilute sulphuric acidB. Concentrated sulphuric acidC. Aqueous NaClD. Molten NaCl |
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Answer» Correct Answer - D NaCl is a compounds. Every compound is a pure substance. Molten NaCl means NaCl in liquid state, hence molten NaCl is a pure substance. |
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| 11. |
The temperature at which solid changes to liquid is called _________A. melting pointB. boiling pointC. evaporationD. condensation |
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Answer» Correct Answer - A The temperature at which solid converts in to liquid is called melting point |
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| 12. |
Preparation of salt from sea water involvesA. evaporationB. filtrationC. sedimentation and decantationD. sublimation |
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Answer» Correct Answer - A Preparation of salt from sea water involves evaporation in which water undergose evaporation leaving behind salt. |
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| 13. |
Baking soda `(NaHCO_(3))` is a compound becauseA. the constituents retain their properties.B. the constituents van be separated by physical methods.C. the constituents are combined chemically.D. it is heterogeneous in nature. |
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Answer» Correct Answer - C In banking soda `(NaHCO_(3))`, the constitutions are combined chemically in fixed weight ratio and hance it is compound. |
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| 14. |
A form of which of the following non-metal is the hardest substance ?A. PhosphorusB. SulphurC. IodineD. Carbon |
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Answer» Correct Answer - D An allotrope of carbon, namely diamond is the hardest substance. |
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| 15. |
Among the following a pair of a compound and an element respectively isA. iron powder, rust powder.B. rust powder, iron powder.C. lime, rust powder.D. rust powder, lime. |
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Answer» Correct Answer - B Rust is compound that is hydrated ferric oxide. Iron powder is an element. |
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| 16. |
Rate of evaporation of waterA. is more in coastal area than in non coatal area.B. is more in non coastal area than in coatal area.C. is the same in both caostal and non coastal areas.D. Cannot be predicted. |
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Answer» Correct Answer - B Rate of evaporation is inversely proportional to humidity. In non-coastal areas humidity is less when compared to coastal areas, and hence rate of evaporation of water is more in a non-coastal area when compared to coastal area. |
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| 17. |
Identify true statement among the following.A. The constituents of both compound and mixture can be separated by physical methods only.B. The constituents of both compound and mixture can be separated by chemical methods only.C. The constituents of compounds and mixture can be separated by chemical method and physical methods respectively.D. The constituents of compounds and mixture can be separated by physical methods and chemical methods respectively. |
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Answer» Correct Answer - B The constituents of a compound do not retain their properties. Hence they can be separated by chemical methods. The constituents of a mixture retain their properties. Hence they can be separated by physical methods. |
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| 18. |
The inter conversion involved in usage of "odonil" in wash room is ________ .A. sublimationB. depositionC. meltingD. freezing |
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Answer» Correct Answer - A Odonil undergose sublimation, that is, solid is converted into vapour state. |
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| 19. |
Property responsible for spreading of fragrance of flower is ________ .A. compressibility of gas/vapourB. diffusion of gas/vapourC. expansibility of gas/vapourD. Both 3 and 2 |
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Answer» Correct Answer - B Molecules of gas/vapour diffuse easily into each other. |
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| 20. |
Iron powder and powder of rust are taken in two containers X and Y respectively. Dilute sulphuric acid is added to both the containers. ThenA. effervescence is observed in two containers.B. effervescence is observed in case of X but not Y.C. effervescence is observed in case of Y but not X.D. no effervescence is observed in both cases. |
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Answer» Correct Answer - B Iron is an element and rust is a compound of iron in which iron does not retain its properties and hence rust does not liberate hydrogen gas with dilute sulphuric acid and no effervescence is observed in container Y. |
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| 21. |
Assertion (A) : Baking soda `(NaHCO_(3))` is a compound. Reason (R ) : Properties `NaHCO_(3)` are absolutely different from sodium, carbon, hydrogen and oxygen.A. Both A and R are true and R is the correct explanation for A.B. Both A and R are true but R is not the correct explanation for A.C. A is true and R false.D. A is false and R is true. |
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Answer» Correct Answer - A The constituents of baking soda that is Na, H, C and O do not retain their properties and hence backing soda is a compound. |
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| 22. |
Identify the true statement among the following.A. Both compounds and mixtures are homogeneous.B. Both compounds and mixtures are homogeneous.C. Compounds are homogeneous and mixtures are heterogeneous.D. Compounds are homogeneous and mixtures can be homogeneous or heterogeneous. |
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Answer» Correct Answer - D Compounds are homogeneous while mixture can be either homogeneous or heterogeneous |
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| 23. |
Water sticks to due to __________A. adhesive forces between water and glass.B. cohesive forces between water and glass.C. cohesive forces between water molecules.D. cohesive forces between glass molecules. |
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Answer» Correct Answer - A Water sticks to glass due to adhesive forces acting between water and glass. |
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| 24. |
Lime water is a _________A. mixtureB. elementC. compoundD. All the above |
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Answer» Correct Answer - A Lime water is a saturated solution of calcium hydroxide hence it is a mixture |
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| 25. |
The process of separation of components of muddy water isA. decantationB. sublimationC. magnetic separationD. None of these |
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Answer» Correct Answer - A The process is decantation as mud being heavier than water settles down at the bottom due to gravity and separates from water |
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| 26. |
A drop of water contains_________A. 2 atoms of hydrogen and one atom of oxygenB. 1 molecules of hydrogen and one atom of oxygenC. millions of molecules of waterD. one molecule of hydrogen and one molecule of oxygen |
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Answer» Correct Answer - C A drop of water contains. Millions of molecules of water |
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| 27. |
Germanium is a _________A. gasB. metalC. liquidD. metalloid |
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Answer» Correct Answer - D Germanium has the properties of metals as well as non-metals hence it is metalloid |
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| 28. |
Dogs stretch out tongues generally in summer becauseA. evaporation lead cooling.B. of condensation of water vapour.C. of freezing of saliva.D. their body temperatures are high. |
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Answer» Correct Answer - A Tongues of does on exposure to atmosphere enable the saliva to undergo evaporation which causes cooling. And hance body temperature decreases. |
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| 29. |
Identify the odd one among the following with respect to tensile strength as well as ductility.A. Gas carbonB. DiamondC. GraphiteD. Carbon fibre |
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Answer» Correct Answer - D Carbon fiber, a recently developed allotrope of carbon is ductile and has high tensile strength |
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| 30. |
Identify the soft metal amoung the following.A. IronB. AluminiumC. MagnesiumD. Potassium |
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Answer» Correct Answer - D Potassium is a soft metal. |
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| 31. |
Generally metalsA. are solidsB. are good conductors of heatC. have high tensile strengthD. All the above |
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Answer» Correct Answer - D Generally, metals are solids having high tensile strength. They are also good conductors of heat. |
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| 32. |
Identify the false statement among the following.A. Compound is homogeneous in nature.B. In compounds constituents do not retain propertiesC. The constituents of mixture can be separated by physical method.D. during formation of mixtures there is a change in the molecular composition |
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Answer» Correct Answer - D During the formation of a mixture the constituent substances are mixed physically and hence there is no change in molecular composition during the formation of mixtures. |
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| 33. |
Which among the following is a bad conductor of electricity ?A. ZincB. CopperC. AluminiumD. Phosphorus |
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Answer» Correct Answer - D Generally, non-metals are bad conductors of electricity and hence phosphorus is a bad conductor of electricity. |
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| 34. |
Arrange the following substance in the ascending order of the number of constituent element(s) present in them. (a) Sodium bicarbonate, (b) Calcium carbonate ( c) Water, (d) CopperA. d,c,b,aB. c,b,a,dC. b,a,d,cD. a,b,c,d |
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Answer» Correct Answer - A d,c,b,a (i) Copper (ii) Water (iii) Calcium carbonate (iv) Sodium bicarbonate |
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| 35. |
The smallest particle of an element which may or may not have independent existence is called a/anA. atomB. moleculeC. compoundD. ion |
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Answer» Correct Answer - A An atoms is the smallest particle of an element which may not have independent existence. |
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| 36. |
With an increase in the surface area of a liquid, the rate of evaporation__________ . |
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Answer» Correct Answer - increases increases The rate of evaporation is directly proportional to the surface area of liquid. |
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| 37. |
Identify true statement among the following.A. Gases are highly compressible and diffuse very easily.B. Gases are highly compressible and possess strong forces.C. Solid molecules are closely packed and highly compressible.D. Solid molecules are loosely packed and possess strong forces. |
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Answer» Correct Answer - A In gases, intermolecular forces of attraction are negligible and hence they are highly compressible and diffuse very easily. |
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| 38. |
Which among the following is an element ?A. Calcium oxideB. Common saltC. OzoneD. Water |
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Answer» Correct Answer - C Molecules of an element possess similar atoms and hence ozone is an element. |
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| 39. |
The most convenient way of separating saw dust from water isA. distillationB. evaporationC. filtrationD. sedimentation and decantation |
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Answer» Correct Answer - C As saw dust floats on water, it can separated from water by filtration easily. |
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| 40. |
Evaporation is the process of conversion ofA. a liquid to its gaseous state below the boiling point of the substanceB. a liquid to its gaseous state at the boiling point of the substanceC. a liquid to its liquid state at the melting point of the substanceD. a liquid to its liquid state below the melting point of the substance |
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Answer» Correct Answer - A Evaporation can be defined as the change of state of liquid to gas or vapour from the surface of liquid below its boiling point. |
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| 41. |
Property exploited in the usage of perfumes is _______ .A. compressibility of gasesB. diffusion of gasesC. expansibility of gasesD. Both (3) and (2) |
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Answer» Correct Answer - D In gases, intermolecular space is more, so they undergi expansion by releasing pressure and hance they diffuse into each other forming a homogeneous mixture. |
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| 42. |
Rate of evaporation of waterA. is more in coastal area than in non-coatal area.B. is more in non-coastal area than in coatal area.C. is the same in both caostal and non-coastal areas.D. Cannot be predicted. |
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Answer» Correct Answer - B Rate of evaporation is inversely proportional to humidity. In non-coastal areas humidity is less compared to coastal areas, and hence rate of evaporation of water is more in a non-coastal area compared to coastal area. |
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| 43. |
Sublimation is involved in _________ .A. incense stick and odonil.B. camphor and incense stickC. perfume and odonil.D. naphthalene balls and camphor. |
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Answer» Correct Answer - D Naphthalene balls and camphor undergo sublimation |
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| 44. |
Which among the following pairs possess low melting points ?A. Megnesium, mercuryB. Mercury, manganeseC. Sodium, potassiumD. Calcium. Manganese |
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Answer» Correct Answer - C Sodium and potassium have low melting are boiling points. |
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| 45. |
Which among the following is a heterogeneous mixture ?A. Soda waterB. Liquid ammoniaC. MilkD. Sugar water |
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Answer» Correct Answer - C Milk is a heterogeneous mixture as the constituents are non-uniformaly distributed. |
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| 46. |
Which of the following is a heterogeneous mixture ?A. A mixture of water and sugarB. A mixture of water and common saltC. A mixture of water and saw dustD. A mixture of water and glucose |
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Answer» Correct Answer - C Mixture of water and dust is a heterogeous mixture smnce saw dust is insoluble in water. |
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| 47. |
Gases form homogeneous mixture due to theirA. diffusiblity.B. high compressibility.C. expansibility.D. low density. |
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Answer» Correct Answer - A Gasses have maximum intermolecular spaces and hence they diffuse into each other, forming homogeneous mixture. |
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