Chemistry - Online Test

Q1. For Freundlich isotherm a graph of log (x/m) is plotted against log p. The slope of the line and its y – axis intercept respectively corresponds to
Answer : Option C
Explaination / Solution:

x/m =k.p1/n

 log(x/m )=logk+ 1/ n logp

y=c+mx

m = 1/n and c= logk


Q2. Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in
Answer : Option C
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.

Q3. Macromolecules are one of the following
Answer : Option A
Explaination / Solution:

Polymers are higher molecular weight macromolecules.

Q4. Select the molecule which has only one π bond.
Answer : Option A
Explaination / Solution:
No Explaination.


Q5. Elements having +5 oxidation state is
Answer : Option D
Explaination / Solution:

The maximum oxidation state shown by a p-block element is equal to the total number of valence electrons (i.e., the sum of the s and p-electrons).

P:[Ne]3s23p3. Total valence electrons =5 so it will show +5 oxidation state. The stability of +5 oxidation state decreases down the group due to inert pair effect.


Q6. Thermodynamics is the branch of physical science concerned with
Answer : Option A
Explaination / Solution:

Thermodynamics deals with heat and its transformation from one form to another. The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.

Q7. In which of the following , NH3 is not used?
Answer : Option A
Explaination / Solution:
No Explaination.


Q8. An alcohol (x) gives blue colour in Victormeyer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?
Answer : Option A
Explaination / Solution:

2 R - OH + 2Na 2 RONa + H22 moles of alcohol gives 1 mole of H2 which occupies 22.4L at 273K and 1 atm

number of moles of alcohol = ( 2 moles of R - OH / 22.4 L of H2 ) × 560 mL

= 0.05 moles

no. of moles = mass / molar mass

molar mass = 3.7/0.05 = 74 g mol1

General formula for R - OH Cn H2n+1 - OH

n(12) + (2n+1) (1) + 16+1=74

14n = 74 – 18

14n = 56

n = 56/14 = 4

The 2 alcohol which contains 4 carbon is CH2 CH(OH)CH2CH3


Q9. Metals which occur in native state in nature
Answer : Option B
Explaination / Solution:

Least reactive metals are found in native state.

Q10. Chemistry does not play a major role in
Answer : Option C
Explaination / Solution:

Chemistry does not deal in explaining superconductivity.

*In superconducting materials the charecteristics of superconductivity appear when the temperature is lowered below a critical temperature.

*The onset of superconductivity is accompanied  by abrupt changes in physical properties which are more related to phase transitions of the material .

These aspects of  studies in properties of materials  are better related to studies in the fields of Physics , eventhough  principles involved in Chemistry & Physics go hand to hand.