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Answer:
Diamond is made of carbon atoms which form a lattice structure.It has a giant covalent structure. The covalent bonds here are extremely strong. Thus, there are no forces which can be introduced by a solvent which is strong enough to break these covalent bonds and dissolve the structure.
which one dear ??
Answer:
....SECTION 1...
QUESTION 1
QUESTION 2
a) Quadratic polynomial having only one zero, is like (x−1)2
f(x)⇒x2−2x+1
Only one i.e., at x=1
Note:- We can take any polynomial (x−2)2,(x−5)2.....
b) simple example of a quadratic polynomial with no real zeroes is x^2 + 1 which has roots \pm i where i represents \sqrt{-1}. An example of a polynomial with one real root is x^2 which has only 0 as a root. And an example of a polynomial with two real roots is x^2 - 1, which has roots \pm 1.
QUESTION 3
Even composite numbers from first 20 natural numbers =4, 6, 8, 10, 12, 14, 16, 18, 20
No. even composite numbers from above =9
No. of ways in which a number be picked from first 20 natural =20
∴ Probability of picking up an even composite number from first 20 natural numbers =9/20.
QUESTION 4
....SECTION 2....
OUESTION 1 IN THE PUCTURE.
OUESTION 2
OUESTION 3 The volume V of sphere of radius r is given by V=34πr³
Here, r=2.1 cm
∴V=34×722×(2.1)³
⇒V=38.808 cm³
