Question

- (a)
(b)
What will be the percent mass of copper in cupric oxide-
(i) 22.2% (ii) 79.8% (iii) 63.5% (iv) 16%
For n=3 values of l will be -
(i) 1,2,3
(ii) 0, 1, 2
(iii) 0, 1,3
(iv) None of these
Which of the following has bigger size -
(i) Br (ii) F (iii) I (iv) I
H-Bond is present in -
(i) CH4
(ii) Naci
(iii) H20
(iv) CHC13
Temperature which is same in both °C and °F scale -
(i) 0°C
(ii) 32°F
(iii) -40°C
(iv) 40°C​

Answer 1

Answer:

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Answer 2

Answer:

a) (ii) 79.8%

b) (ii) 0, 1, 2

c) (iv) I

d) (iii) H20

e) (iii) -40°C

Explanation:

a) The percent mass of copper in cupric oxide:

• Mass of copper(Cu) = 63.5 g
• Mass of oxygen(O) = 16 g
• Mass of cupric oxide (CuO) = 63.5 + 16

                                                      = 79.5 g

Mass % of copper in cupric oxide =

(Mass of Copper/Mass of Cupric oxide) x 100

= 63.5/ 79.5 x 100

=79.8%

The percent mass of copper in cupric oxide is 79.8% .

b) For n=3 values of l will be -

• n is the Principal Quantum number.
• l is the Azimuthal quantum number.
• According to the rule the value of l = 0 to (n-1)
• For n = 3 l can be 0 , 1 , 2.

c) Which has bigger size:

• Size increases down the group in the periodic table.
• All the given elements belong to group 17.
• Down the group size increases as new shell is being added.
• So the order of size in group 17 is F < Cl < Br < I.

Thus, I has bigger size.

d) H-Bond is present in -

• Hydrogen bonding is present in molecules having O,N and F along with H.
• Thus H2O has H -bond.

e) Temperature which is same in both °C and °F scale

• At -40°C both °C and °F have the same temperature.

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