Cactive metal but still
SIR_9624363016
d.Why corrosion of iron metal is a serious problem?
e. How can we preverit corrosion of iron?
Page 1
SCIENCE
NAVNEET
Answer the following questions as directed:
2. What is meant by Valency?
3. In an electric circuit, how can the battery having !
4.1 am a chief constituent of biogas." Identify me.
5. Mention the full form of CFC.
tery having 12 V be show
6. Which tree leaves are used in manufacture OI
in manufacture of bidies ?
Section B
Answer the following Q. no. 17 to 26 (within the limit
directed: [2 marks each]
V.A milkman adds a very small amount of baking soda to ires
(A) Why does he make the milk slightly alkaline ?
(B) Why does the milk take a long time to set as curd ?
8. Give scientific reason : Hydrogen gas is not evolved when copper r
9. An atom has electronic configuration 2, 8, 7.
S A) What is the atomic number of this element ?
(B) To which of the following elements would it be chem
numbers are given in parentheses.)
N(7), F(9), P(15), Ar (18)
OR
Answer the following questions based on depiction of Grou
modern periodic table :
Answers
Answered by
0
Answer:
corrosion of iron can be prevented by
oiling
greasing
anodizing
galvanisation
Answered by
0
Answer:
Corrosion of iron is a serious problem as it might rupture the whole structure if not taken care properly and it's cost demanding to take care of rusted iron.
Corrosion can be prevented by painting , gresing, anodising , galvanizing etc
Valence of an element is determined by the no of valence electrons present in the outermost shell of an atom
Chief constituent of biogas is METHANE
75%
CFC = Chloro Fluoro Carbon
to neutralise the lactic acid in it , so that it takes a long time to become curd
cause the milkman made it alkaline
atomic number of the element is 17
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