answers of question 25and 26
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B)-hydrogen gas
C)-oxygen gas
D)-It is used in the treatment of
patients who are unable to take
fluids and nutrients by mouth.
-It is also used as a food
preservative
E) use of hydrogen gas
-It is the lightest element and can
be used as a lifting agent in
balloons.
-Since Hydrogen gas is highly
flammable, it can be dangerous to
use. But this property and others
make Hydrogen suitable for use
as a fuel.
Use of oxygen gas
- helps in respiration.
-Oxygen gas is used for oxy-
acetylene welding and cutting
of metals.
iio816467:
question
Ohh sorry i did not see that! Wait m telling!
ok
Gold and platinum are even known as noble metals. They are not affected by air, water and even by chemicals. Since they have bright lustre, jewellery can be made from them. ... Due to the presence of this layer, the metal becomes un reactive and can be used in making cooking utensils.
B) because they are highly reactive with the oxygen gas. Thats why they are kept.
C)Aluminium metal with this protective layer is used for making cooking utensils. Aluminium is a good conductor of heat.Thats why it is extensively used for making cooking utensils. Aluminum will form a layer of protective oxide that prevents further reaction.
I do not know the answer of D
ok
E)An electropositive element is one that has tendency to lose electrons and form positively charged ion. Metals like Na, Mg, K, Ca, Fe, Zn lose electrons and form positively charged ion. Due to this metals are called electropositive elements.
sorry but 25th answer is wrong
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