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.
| 1. |
What are the advantages of anrometer over mercury barometer? Give the applications of aneroid barometer. |
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Answer» Solution :(i) Comparison of COMPONENTS of both the TYPES of BAROMETERS. (II) Comparison of easeof usage and construction. (iii) Comparison of sensitivity. |
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| 2. |
Which of the following metals on treatment with concentrated alkali gives hydrogen gas? |
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Answer» Na |
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| 3. |
Tyndal effect cannot be shown by |
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Answer» smoke |
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| 4. |
Which among the following salts produces maximum number of metal ions per molecule when dissolved in a suitable solvent ? |
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Answer» Aluminium phosphate `AIPO_4` (1) `AlPO_4` (2) `Mg_3(PO_4)_2` (3) `Na_2HPO_4` (4) `Al(H_2PO_4)3` `Mg_3(PO_4)_2` will produce maximum number of METAL ions by dissolving in a suitabe SOLVENT. |
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| 5. |
What makes the use of hydrogen as a fuel difficult ? Give reasons in support of your answer. |
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Answer» SOLUTION :(i) Physical property of hydrogen . (ii) State of fuel. (III) CRITICAL TEMPERATURE of hydrogen. (iv) Existance of hydrogen. (v) Extraction of hydrogen. (vi) Ignition temperature of hydrogen. |
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| 6. |
Why are the double decomposition rcac:Lions also called double dispbcement reactions? |
| Answer» SOLUTION :MUTUAL EXCHANGE of RADICALS. | |
| 7. |
Which property of German silver makes it useful for makingimitation jewellery? |
| Answer» SOLUTION :APPEARANCE as AG, MALLEABILITY, DUCTILITY | |
| 8. |
What do you mean by desiccating agent ? |
| Answer» SOLUTION :HYGROSCOPIC SUBSTANCE which ABSORB WATER. | |
| 9. |
Which among the following elements does not float on water / |
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Answer» Na |
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| 10. |
What is the method of separation of (a) N_(2)-CO_(2) mixture, (b) H_(2) -O_(2) mixture, (c ) NH_(4)Cl, KCl and sand mixture, (d) Ink-water mixture |
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Answer» SOLUTION :(i) SUITABLE solvent. (ii) Molecular weight. (iii) Sublimation, suitable solvent. (iv) Suitable ADSORBENT |
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| 13. |
When coppcr metal is subjected to treatment With nitric acid, difFerenr. oxides of nitrogen are liberated with different concentrations ofnitric acid. Explain the reason |
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Answer» SOLUTION :(i) Property of `HNO_3` (ii) NATURE of `HNO_3`. (III) Effect of concentration on oxidizing capacity of `HNO_3`. |
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| 14. |
Two beakers A and I3 contain water. Glucose is added to beaker A and ammonia gas is passed through beaker B. What types of changes (physical or chemical) take place in the beakers? Justify. |
| Answer» Solution :When glucose is added to BEAKER A containing WATER, dissolution takes place. It is a PHYSICAL change. When ammonia gas is passed through beaker B containing water, formation of `NH_4OH` takes place. This is a chemical change. | |
| 15. |
When ammonia is burnt in a limited supply of oxygen, which gas is evolved? |
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Answer» NO `4NH_(3)+3O_(3)overset(Delta)to2N_(2)+6H_(2)O` |
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| 17. |
What is the layer of atmosphere present just above the earth's surface? |
| Answer» SOLUTION :TROPOSPHERE | |
| 18. |
Two containers A and B contain same kind of matter and kinetic energy of molecules in A is more than that of B. Explain in which container the specific heat of matter is more. Give reason. |
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Answer» SOLUTION :(i) Relation between specific heat and INTER MOLECULAR force of attractions. (ii) Relation between KINETIC energy and temperature (iii) Relation between kinetic energy and inter molecularforces of attaraction in A and B. (IV) Relation between inter molecular forces of attraction and the heat requried. |
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| 19. |
Which of the following double displacement reactions is correct? |
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Answer» `AB+ CDto AC + BD` |
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| 20. |
When was the Ganga Action Plan launched? |
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Answer» |
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| 22. |
The salt of hypohalous acid is prepared from the respective components namely halogen and the corresponding metallic hydroxide. The metal is the one which possesses the number of ckctrons in the ratio of 1 : 4 : 4 : 1 which corresponds to namely K, L, M, N shells respectively and the halogen is a greenish-yellow colour gas which can displace bromine from magnesium bromide. Identify the salt and the respective components. |
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Answer» Solution :(i)Identification of the metal from GIVEN ratio. (II)Identification of halogen BASED on colour. (iii)Identification of CHEMICAL FORMULA of salt of oxyacid. |
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| 23. |
What is corrosion ? How does iron get corroded? |
| Answer» SOLUTION :WEARING away of METAL, presence of moisture, air | |
| 24. |
whichamongthefollowingprocesses doesnotaddsuspendedparticulate matter (S.P.M) to air? |
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Answer» USAGE of AIR conditioners. |
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| 25. |
What is meant by greenhouse effect? Name some greenhouse gases. |
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Answer» Solution :(i) Temperature (II) INFRA RED RADIATIONS. (III) Absorption |
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| 26. |
What is the valency of Magnesium? |
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Answer» 1 |
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| 28. |
Under the normal conditions of temperature and pressure, the metal mercury remains in a ________ state. |
| Answer» SOLUTION :LIQUID STAE. | |
| 30. |
You must have had an experience of burning a piece of paper. Does it burn when a burning matchstick is brought near it? |
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Answer» |
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| 31. |
When sodium or potassium is dropped in water, we can observe a golden yellow or a lilac coloured flame respectively whereas when calcium is dropped , no flame is observed . Why is there a difference in observation in the above two cases? |
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Answer» Solution :(i) Comparision of Na , K , Ca with that of WATER. (II) Comparision of physical properties of Na , K and Ca. (III) Type of REACTION that takes place when these metals react with water . (IV) Condition required for burning. |
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| 32. |
Two elements X and Y have 6 and 7 electrons in their N-shell and M-shell respectively . Find the ratio of atomic numbers of X and Y. |
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Answer» `3:4` |
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| 33. |
Two liquids A and B were taken in two diffrernt barometer, the density of A is greater than that of B. Which liquid is preferable to be used as barometric liquid if the variation in pressure is every minute and why? |
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Answer» Solution :(i) Relation between DENSITY of LIQUID, PRESSURE variation and height of the column. (ii) Relation between the density of the barometirc liquid and height of the column of the liquid. (III) Effect on the height of the column of the liquid due to the change in external pressure. (IV) Comparison of the change in heights of column of liquid A and that of B with a minute change in external pressure. |
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| 34. |
Under the normal conditions of temperature and pressure, the nonmetal bromine exists in _____ state. |
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Answer» solid |
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| 35. |
Two compounds X and Y, when dissolved in water, produced sodium bicarbonate. If hydrochloric acid is added to compound 'X', compound Y is liberated. Identify X and Y. |
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Answer» Solution :`X+Y+H_(2)O to NaHCO_(3)` `X+HCl to Y` X should be the CARBONATE of sodium which produces bicarbonate, secondaly X on reaction with ACID like HCl produces `CO_(2)` henc Y is `CO_(2)`. The reaction is `Na_(2)CO_(3)+CO_(2)+H_(2)O to 2 NaHCO_(3)` (X)(Y) |
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| 36. |
Water is not suitable to extinguish fire caused by petrol. Explain. |
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Answer» SOLUTION :(i) DIFFERENCE in the pyhsical property of water and PETROL. (II) Role of water for extinguishing fire. |
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| 37. |
The valency of a metal is 2 and its atomic weight is 24. What will be the molecular weight of its (a) sulphite(b) chloride(c )chloride? |
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Answer» Solution :(I)FORMULA of salts bsed on valency of METAL. (ii)DERIVATION of formulae of the compounds based on the valency of the metal. (iii)Significance of CORRESPONDING molecular weight. |
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| 39. |
Which one of the following is not a thermoplastic? |
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Answer» Polythene |
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| 40. |
Which of the following has maximum compressibility? |
| Answer» Solution :SINCE chlorine is a gas at room temperature, it can be COMPRESSED to the maximum. | |
| 41. |
What is ozone hole? |
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Answer» |
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| 42. |
When Shashi went to Vizag with his parents, he noticed that all the fishermen stores their fish inside a thermally insulated container which is filled with ice and salt. Can you give explanation for this? |
| Answer» Solution :Salt ADDED to ice(freezing mixture) is a better refrigerant than ice as adding some impurity (salt ) to the ice decreases its melting point. During meltingof ice, it takes away a LOT of heat from the substance(s) which is in contact with it. That's why the fisherment store their FISH inside a thermally INSULATED CONTAINER which is filled with ice and salt. | |
| 43. |
To draw the geometrical representation for the structure of the oxygen atom the following steps are given . Identify the correct sequence of steps. (a) The eight electrons present in the extra-nuclear part would be distributed in the first two orbits that is K and L. As per the rules , two electrons would occupy K orbit and the remaining six electrons occupy the L orbit. (b) The atomic number of oxygen is 8. ltbr. (c) In the nucleus , 8 protons and 8 neutrons and present and in the extra-nuclear part, that is in the orbits, 8 electrons are present. (d) Oxygen atom has 8 electrons and 8 protrons . The mass number is 16 , hence number of neutrons is equal to 8[""_(8)O^(16)] |
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Answer» b a c d (ii) Oxygen atom has 8 electrons and 8 protons . The mass number is 16, hence hte number of neutrons is equal to `8[""_(8)O^(16)]`. (iii) In the nucleus, 8 protons and 8 neutrons are PRESENT and in the extra-nuclear part that is in the orbits , 8 electrons are present .(iv) The EIGHT electrons present in extra nuclear part, would be distributed in first two orbits that is K and L . As per the RULES ,two electrons would OCCUPY K orbits and remaining six electrons in L-orbit. |
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| 44. |
Which of following statements regarding glass is false |
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Answer» Glass has high viscosity and HENCE EXISTS in solid state. |
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| 46. |
Two oxides of a metal contain 25.8% and 41.02% of oxygen by weight respectively. Find the ratio of weights of metal combining with fixed weight of oxygen? |
Answer» SOLUTION :ASSUME the weight of each oxide is 100G.  25.8 g of oxygen reacts with 74.2 g of metal. 1 g of oxygen reacts with `=(1xx74.2)/(25.8)` = 1.437 g of metal `:.` The ratio of weight of the metal combining with FIXED weight of oxygen in the two oxides is `2.87:1.437=2:1`(apprpx) |
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| 47. |
While balancing a chemical equation, only the coefficients of the formulae arc changed, but the subscnpts are not changed. Give reasons |
| Answer» SOLUTION :SIGNIFICANCE of COEFFICIENT and SUBSCRIPTS associated with the formula. | |
| 48. |
To obtain hydrogen and oxygen front water, what are the conditions to be maintained? What are the different name that can be given to this reaction? |
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Answer» SOLUTION :(i) ACIDULATED vvater. (II) ELECTROCHEMICAL REACTION |
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| 49. |
What is the difference between deliquescent substance and hygroscopic substance ? |
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Answer» SOLUTION :(i) TEMPERATURE (II) CHANGE of STATE |
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| 50. |
What are thermosetting plastics? State the types of thermosetting plastics, their characteristics and use. |
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Answer» |
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