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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?

VGS PUBLICATION-BRILLIANT-COMBUSTION , FUELS AND FLAME-EXERCISE
  1. List the ways adopted by fire fighters to combat fires.

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

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

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

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

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  6. Spirit burns quickly like petrol but sodium metal and white phosphorou...

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

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

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

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  10. Collect information about the history of spherical mirrors in human ci...

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

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  12. How does candle work?

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  13. Give reasons. LPG is a better domestic fuel than wood.

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  14. Explain how the use of CNG in automobiles has reduced pollution in our...

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  15. The example for combustible material

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  16. The example for non-combustible material

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  17. The gas needed for combustion among the following is

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  18. Fire produced by oil cannot be controlled by .

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  19. Fuel must be heated to its temperature before it starts burning.

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  20. The outermostzone of candle is in colour.

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