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Explain giving reasons: In which of the ...

Explain giving reasons: In which of the following situations water will get hearted in shorter time?
Srikar kept water beaker near the wick in the yellow part of a candle flame.

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Explain giving reasons: In which of the following situations water will get hearted in shorter time? Sonu kept water beaker in the outermost part of the flame.

Which of the following processes are chemical changes? Give reasons. Evaporation of water.

Identify which of the following statements are wrong and give reasons. That which lives in water cannot eat animals.

Read the given information and answer the following questions. A survey was conducted in two villages, Vanaparthy and Vaddicherla of Warangal district in Telangana State. The first with no scarcity and the second with scarce groundwater. Well census was carried out in the villages in order to get a complete picture of well irrigation and its status as well as availability of water. There are no alternative sources of supply as against wells in Vaddicherla, where there is an existing tank that has been converted into a percolation tank, so that the water situation is much better in Vanaparthy. In which village, do you suggest drip irrigation ?

A compound (A) is greenish crystalline salt, which gave the following results. i) Addition of BaCl_(2) solution to the solution of (A) results in the formation of white ppt. (B). which is insoluble in dil HCL ii) On heating (A), water vapours and two oxides of sulphur, (C) and (D) are liberated leaving a red brown residue (E) iii) (E) dissolves in warm conc. HCI to give a yellow solution (F). iv) With HS the solution (F) yields a pale yellow ppt. (G) which when filtered, leaves a greenish filtrate (H). v) Solution (F) on treatment with thiocynaate ions gives blood red coloured compound (I). The yellow solution is of

A compound (A) is greenish crystalline salt, which gave the following results. i) Addition of BaCl_(2) solution to the solution of (A) results in the formation of white ppt. (B). which is insoluble in dil HCL ii) On heating (A), water vapours and two oxides of sulphur, (C) and (D) are liberated leaving a red brown residue (E) iii) (E) dissolves in warm conc. HCI to give a yellow solution (F). iv) With HS the solution (F) yields a pale yellow ppt. (G) which when filtered, leaves a greenish filtrate (H). v) Solution (F) on treatment with thiocynaate ions gives blood red coloured compound (I). White ppt (B) is of

A compound (A) is greenish crystalline salt, which gave the following results. i) Addition of BaCl_(2) solution to the solution of (A) results in the formation of white ppt. (B). which is insoluble in dil HCL ii) On heating (A), water vapours and two oxides of sulphur, (C) and (D) are liberated leaving a red brown residue (E) iii) (E) dissolves in warm conc. HCI to give a yellow solution (F). iv) With H2S the solution (F) yields a pale yellow ppt. (G) which when filtered, leaves a greenish filtrate (H). v) Solution (F) on treatment with thiocynaate ions gives blood red coloured compound (I). Compound (A) is

Complex compounds are molecular compounds which retain their indentities even when dissolved in water. They do not give all the simple ions in solution but instead furnish complex ions. The complex compounds are often called coordination compounds because certain groups called ligands are attached to the central metal ion by coordinate or dative bonds. Coordination compounds exhibit isomerism, both structural and stereoisomerism. The struculre, magnetic property, colour and electrical properties of complexes are explained by various theories. which of the following pairs, both the complexes have the same geometry?

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  1. List the ways adopted by fire fighters to combat fires.

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  2. The oil fires should not be sprayed with water. Why?

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  3. What precautions are to be taken while pouring water on fire?

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  4. "Is combustion possible without the supply of oxygen? Discuss with you...

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  5. Why a wick is not used in gas burners?

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  6. Collect information available on different fuels. Find out the post pe...

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  7. Collect the information about annual fuel consumption in different par...

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  8. Water is not used to control fires involving electrical equipment.Why?

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  9. It is difficult to burn a heap of green leaves but not a heap of dry l...

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  10. Explain giving reasons: In which of the following situations water wil...

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  11. Explain giving reasons: In which of the following situations water wil...

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  12. Draw the diagram of candle flame and label all the zones.

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  13. Give supporting arguments for both the statements (1) fire is useful (...

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  14. In a few years the fuels on earth will be exhausted. Think, what would...

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  15. What would happen if oxygen stops to support combustion? Make a guess....

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  16. Use of more fuels in our daily life causes air pollution and it is har...

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  17. How do you organize your daily works with fuels to conserve bio-divers...

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  18. How do you feel about "Fuels have become a part of human life"?

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  19. Let us assume that you are on the moon. If you try to focus sunlight o...

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  20. Project work: Collect information about the experiments of Joseph Prie...

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