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The 1830 Revolt in France to Establish Constitutional Monarchy

Question 14Wh...

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Question 14
Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

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Solution

Wheat dough is a good source of carbohydrates. Carbohydrates present in the wheat dough encourage the growth of yeast and other saprophytic fungi which break down the carbohydrates and emit a foul smell and make the dough unfit for use.

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Q. Question 14
Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Wheat dough if left in the open,it start to emit foul smell and became unfit for use. Give reasons.

When Some wheat dough was left in the open for a few days it started emitting a foul smell. State why?

Q. Question 18
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.
(a) Why did the dough rise?
(b) Why did the dough smell sour?
(c) Why was sugar added to the dough?
(d) What would have happened if the dough was kept in the refrigerator, soon after it was prepared?

Question 38

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.

(a) Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.

(b) Name the black substance formed and give its chemical formula.

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The 1830 Revolt in France to Establish Constitutional Monarchy

Standard X History

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