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Which among the following are physical o...

Which among the following are physical or chemical changes?
(a) Evaporation of petrol
(b) Burning of Liquefied Petroleum Gas (LPG)
`(c)`Heating of an iron rod to red hot
(d) Curdling of milk
`(e)`Sublimation of solid ammonium chloride

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(a) Physical (b) Chemical (c) Physical (d) Chemical (e) Physical.
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DINESH PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS -Short Answer Questions
  1. Write the balanced chemical equations for the following reactions and ...

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  2. Write the balanced chemical equations for the following reactions and ...

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  3. Complete the missing components/variables given as x and y in the foll...

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  4. Which among the following changes are exothermic or endothermic in nat...

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  5. Identify the reducing agent in the following reactions. (a) 4NH(3)+...

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  6. Identify the oxidising agent (oxidant) in the following reactions {:...

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  7. write the balanced chemical equations for the following reaction. (a...

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  8. A solution of potassium chloride when mixed with silver nitrate soluti...

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  9. Ferrous sulphate decomposes with the evolution of a gas having a char...

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  10. Why do fire flies glow at night?

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  11. Grapes hanging on the plant do not ferment but after being plucked fro...

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  12. Which among the following are physical or chemical changes? (a) Eva...

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  13. During the reaction of some metals with dilute hydrochloric acid, foll...

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  14. A substance X, which is an oxide of a group 2 element, is used intensi...

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  15. Write a balanced chemical equation for each of the following reactions...

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  16. Why do we store silver chloride in dark coloured bottles?

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  17. Balance the following chemical equation and identify the type of chemi...

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  18. A magnesium ribbon is burnt in oxygen to give a white compound X accom...

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  19. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid...

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  20. A silver article generally turns black when kept in the open for a few...

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