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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Give examples t show that plastics are non-corrosive in nature. |
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| 2. |
Give examples of noble metals. Why are thy called noble metals? |
| Answer» SOLUTION :REACTIVITY | |
| 3. |
Give equations for the decomposition of potassium permanganate and hydrogen peroxide. In what way do the two processes differ from each other? |
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Answer» Solution :(i) CATALYST used (II) Products OBTAINED |
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| 4. |
Give any two uses of calcium carbonate. |
| Answer» SOLUTION :ANTACID, lab PREPARATION of `CO_(2)` | |
| 5. |
Give any four characteristics of air as a mixture. |
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Answer» SOLUTION :(i) Chemical PROPERTIES (ii) Boiling point (iii) Heat change (IV) Chemical FORMULAE |
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| 6. |
Give a balanced chemical equation for the combustion of glucose. |
| Answer» SOLUTION :`C_(2)H_(12)O_(6)+6O_(2_to6CO_(2)+6H_(2)O+"Energy"` | |
| 7. |
Generally CaCO_(3) is insoluble in water but in the presence of carbon dioxide it is soluble. This is because. |
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Answer» of the formation of carbonic acid. |
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| 8. |
Gases cannot be liquefied above a certain temperature called _________. |
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| 9. |
Gas carbon is used as ________ in dry cells. |
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| 11. |
Formula of fluorapatite is"___________" |
| Answer» SOLUTION :`3Ca_3(PO_4)CaF_2` | |
| 13. |
Formation of sodiurn nitrite and oxygen by thermal decornposition of sodiurn nitrate involves onlychemical change. |
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| 14. |
Formation of coal from matter under the earth at high temperature and pressure in the absence of oxygen over millions of years. |
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| 15. |
For the following properties listed below, arrange solids, liquids and gases either in the increasing or decreasing order as indicated against them. (i) Diffusibility(ii) Intermolecular spaces (iii) Thermal expansion(iv) Intermolecular force of attraction |
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Answer» Solution :(i) Increasing order: Solids, LIQUIDS, gases (II) Decreasing order: Gases, liquids, solids (III) Increasing order: GAS, liquids, solids (iv) Decreasing order: Solids, liquids, gases |
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| 16. |
For a certain purpose, a liquid having a liquid range from - 10^(@)C " to " 110^(@)C is required in large quantities. What is the suitable liquid for the above purpose and how can it be used? |
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Answer» SOLUTION :(i) Liquid that has liquid range close to `-10^(@)C " to " 110^(@)C` (ii) FACTORS that affect MELTING and BOILING POINTS. (iii) Changes that can depress freezing point and clevate boiling point. |
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| 17. |
Following is used as a reducing agent in metallurgy i.e. extraction of metals in blast furnace. |
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Answer» CARBON dioxide |
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| 18. |
Following is an amorphous allotrope of carbon. |
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Answer» GRAPHITE |
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| 20. |
Fluorine is very reactive and attacks all metals but still a copper vessel is used in the preparation of fluorine gas. Why? |
| Answer» Solution :FLUORINE attacks all metals including including copper. In the PREPARATION of fluorine gas electrolysis is carried out in the copper velssel.Copper reacts with fluorineto FORM stable copper fluoride. This coppper fluoride so formed acts as a PROTECTIVE LAYER against further corrosion of copper. | |
| 21. |
Fishes and many other aquatic species live in river water. When they are kept in aquarium, we need to change the water very often. Give reasons. |
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Answer» SOLUTION :(i) Respiration of fishes in water. (ii) Components REQUIRED for the survival of fishes and aquatic species. (III) Copmarison fo these AMOUNTS in RIVER water and aquarium. |
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| 22. |
Find out the maximum number of electrons that can be accommodated in K shell, L shell, M shell and N shell by using Bohr-Bury scheme. |
| Answer» SOLUTION :MAXIMUM NUMBER of electrons `=2N^(2)` | |
| 23. |
Fill in the blanks with appropriate words. Synthetic fibres are also called _______ or _______ fibres. |
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| 24. |
Fill in the blanks with appropriate words. Synthetic fibres are synthesised from raw material called _________. |
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| 25. |
Fill in the blanks with appropriate words. Like synthetic fibres, plastic is also a _______. |
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| 26. |
Fill in the blanks : The number of people suffering from diseases of the _____ is steadily rising. |
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| 29. |
Fill in the blanks Process of seperation of different constituents from petroleum Is called ………………. |
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| 31. |
Fill in the blanks : Plants utilise carbon dioxide from the atmosphere for _____ |
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| 37. |
Fill in the blanks : Metals are ______ conductors of heat and ______ |
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| 39. |
Fill in the blanks Least polluting fuel for vehicle is ………….. |
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| 40. |
Fill In the Blanks : Metal reacts with _____ to produce hydrogen gas. |
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| 41. |
Fill in the blanks : Many respiratory problems are caused by _____ |
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| 43. |
Fill in the blanks : Iron is _____ reactive than copper. |
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| 44. |
Fill in the blanks : _____in Agra is now one of the seven wonders of the world. |
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| 45. |
Fill in the blanks Fossil fuels are …………………, ………………. and ……………….. |
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| 46. |
Fill in the blanks : Fuel must be heated to its __________before it starts burning. |
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| 48. |
Fill In the Blanks : Copper does not react with dilute ____ even on heating but reacts with ____. |
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| 49. |
Fill in the blanks : Cellulose is made of a large number of ________ units. |
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| 50. |
Fill in the blanks : Burning of wood and coal causes _________ of air. |
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