You have washed you handkerchief and you want to dry it quickly. What all can you do?
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A student accidently spilled concentrated H2SO4 on his hand. Before the teacher got to know, his friend washed his hands
(i) Presence of mind, critical thinking, and dignity of individual. (ii) Pouring dilute sodium hydroxide on the burning hand and keeping in water for 10 minutes can also be done. (iii) 2NaHCO3 +...
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Om, Rohit and Kishore always remain in a hurry. One day, during lunch hour Om and Rohit started gulping food quickly.
(i) Om developed stomach ache as he had not chewed his food properly. Chewing food properly helps in proper breakdown of food and mixing it with saliva. Large food pieces...
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You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
No, it cannot be reversed, so it is an irreversible change.
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Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?
The rate of evaporation increases with increase in temperature. So, near the anghiti or heater, the rate of evaporation will be higher and the uniform will dry up quickly.
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Paheli and Boojho peeled some potatoes and cut them into small pieces. They washed and boiled them in water.
Wash, peel, cut and cook the potatoes. Cooking in a small amount of water and then frying in a small quantity of oil conserves the nutrients.
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Activated sludge should have the ability to settle quickly so that it can:
a. be rapidly pumped back from sedimentation tank to aeration tank
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You have been given some mishri pieces (lumps of sugar). Suggest some ways to dissolve them quickly.
To dissolve the mishri quickly. First it should be crushed to make powder of it. Then after adding it into water, the mixture should be stirred thoroughly. The mixture could also...
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Complete each sentence below by appropriately using any one of the following: if you want to/ if you don’t want to/ if you want him to
(i) Don’t go to the theatre if you don’t want to. (ii) He’ll post your letter if you want him to. (iii) Please use my pen if you want to. (iv) He’ll lend...
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Give reason for the following: Baso4 precipitate is washed with water containing a small amount of H2 SO4 in gravimetric analysis.
BaSO4 dissociates as : BaSO4 (s)- aq------> Ba2+(aq) + SO2 4 - (aq). Addition of H2SO4 gives common SO2 4 - ions dissociation of Ba SO4 and thus helps in...
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His toothbrush is finally (a) in his bag (b) in his bed (c) in his handkerchief (d) lost
(c) Refer to last sentence of the passage.
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