Question

answer this question​

Answer 1

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 2

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