claas10 ch1 science questions
Answers
hey here is your answer :-
✨ Zunc liberates hydrogen gas when react with dilute hydrochloric acid whereas copper does not. Explain why?
✨ Asilver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
(i) why do they turn black? name the phenomena involved ?
(ii) name the black substance formed and write its formula?
✨Why do we store silver chloride in dark coloured bottles?
✨Define rancidity? what kind of substances are used to prevent rancidity .explain any three methods to prevent rancidity ?
✨With the help of an activity demonstrate ,how do we know that a chemical reaction has taken place ?
✨Marble statues open slowly get corroded when kept in open for a long time. Give a suitable explanation.
✨why is hydrogen peroxide kept in coloured bottle ?
✨what is breaking and making of bonds in a chemical reaction called ?
✨A shiny brown coin made up of an element turns Black on heating. what was the element of the coin and what is the black compound formed ?
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