Chemistry - Online Test

Q1. In which of the following Compounds does the central atom obey the octet rule?
Answer : Option D
Explaination / Solution:

Compound  : No. of valance electron on the central atom

XeF2 : 10

AlCl3 : 6

SF6 : 12

SCl2 : 8 


Q2. The number of electrons that have a total charge of 9650 coulombs is
Answer : Option C
Explaination / Solution:

1F = 96500 C = 1 mole of e = 6.023 ×1023 e

9650 C = [ 6.22 ×1023 / 96500 ] × 9650 = 6.022×1022

= 6.022×1022


Q3. Which among the following is not an example of amorphous solids?
Answer : Option B
Explaination / Solution:

Quartz is not amorphous solids
Q4. An aqueous solution of borax is
Answer : Option C
Explaination / Solution:



Q5. Which of the following is incorrect for physisorption?
Answer : Option B
Explaination / Solution:

The incorrect statement is option (b)

Physisorption is an exothermic process. Hence increase in temperature decreases the physisorption.


Q6. Mendeleev 'Periodic Law' states that
Answer : Option B
Explaination / Solution:

If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.

Q7.

In the hydrocarbon


state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

Answer : Option A
Explaination / Solution:
No Explaination.


Q8. For macromolecules to form, one more of the following criteria are essential
Answer : Option B
Explaination / Solution:

Macromolecule is made by joining smaller molecules(monomers)by covalent bond formation.

Q9. [Ar] 3d104s24p3 is the electronic configuration of
Answer : Option C
Explaination / Solution:

Arsenic is a group 15 element and its atomic no. is 33.

Q10. In a closed system, Which of the following take place ?
Answer : Option A
Explaination / Solution:

In a closed system, there is no flow of matter from system to surrounding or vice versa. For example, a certain quantity of fluid bounded within a closed cylinder constitutes a closed system.