Q.V) Answer the following in short:
1) Write the name of largest gland in our body.
2) Name one natural indicator for acid and base.
3) What is the effect of litmus paper on vinegar
4) What is sericulture?
5) What is the chemical name of baking soda?
6) What is the formula of Iron oxide?
7) How crystals of pure substance are obtained?
Answers
Answer:
1) Liver: is the largest gland in body
2) Litmus, turmeric, red cabbage, China rose, etc. are some common natural indicators used widely to show the acidic or basic
3) It is a weak acid which turns blue litmus paper red. Vinegar is roughly 3–9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
4) Sericulture, also called silk farming, is the process of making silk fibers. It starts by raising silkworms and then processing the fibers they produce. Silk fibers are combined into silk thread. The thread can then be twisted into silk yarn or woven into silk cloth (fabric).
5) Sodium hydrogen carbonate
Sodium hydrogen carbonateFormula: NaHCO₃
6) Fe2O3
7) Salt can be obtained by the evaporation of sea water. The salt obtained in this manner is not pure and its crystals are small. ... However, large crystals of pure substances can be formed from their solutions. The process is called crystallisation.
Answer
1. Liver
2. Litmus, turmeric, red cabbage, China rose, etc. are some common natural indicators used widely to show the acidic or basic character of substances. Litmus: Litmus is obtained from lichens. The solution of litmus is purple in colour.
3. It is a weak acid which turns blue litmus paper red. Vinegar is roughly 3–9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
4. Sericulture, also called silk farming, is the process of making silk fibers. It starts by raising silkworms and then processing the fibers they produce. ... The thread can then be twisted into silk yarn or woven into silk cloth (fabric).
5.Sodium hydrogen carbonate
6. Fe2O3
Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO) the rarer form, and iron(II,III) oxide (Fe3O4) which naturally as magnetite.
7. Salt can be obtained by the evaporation of sea water. The salt obtained in this manner is not pure and its crystals are small. ... However, large crystals of pure substances can be formed from their solutions. The process is called crystallisation.