Chemistry - Online Test
Q1. The balance of carbon dioxide and oxygen has been upset by :
Answer : Option B
Explaination / Solution:
The balance of carbon dioxide and oxygen has been upset by Burning fossil fuels and deforestation which causes release of excessive CO2 and reduced O2
Q2. Lines in the hydrogen spectrum which appear in the infrared region of the electromagnetic Spectrum, then they are called as
Answer : Option B
Explaination / Solution:
The Lyman series lies in the ultraviolet, whereas the Paschen, Brackett, and Pfund series lie in the infrared.
Q3. A reduction in the atomic size with increase in atomic number is characteristic of the elements of
Answer : Option C
Explaination / Solution:
In f block elements with increase in atomic number atomic radii decreases smoothly.
Q4. Hydrogenation of vegetable oil using nickel as catalyst gives edible fats. Choose the appropriate one given below.
Answer : Option A
Explaination / Solution:
Vanaspati ghee is manufactured from vegetable or seed oil by a process called 'hydrogenation'.
Vegetable Oil is a viscous liquid, and contains unsaturated fatty acids, upon hydrogenation it is are converted to saturated fatty acids to form vanaspati ghee which is solid/semi solid in nature.
For quick and easy hydrogenation, catalyst like Ni, Pt which are capable of adsorbing hydrogen are used.
Q5. What is used as the complexing agent in volumetric analysis of ions like [Mg2+ and Ca2+
Answer : Option B
Explaination / Solution:
EDTA is hexadentate ligand so it forms stable chelate complex with metal ions.
Q6.
Compound 'A' undergoes formation of cyanohydrins which on hydrolysis gives lactic acid (CH3 CHOHCOOH). Therefore, compound 'A' is
Answer : Option A
Explaination / Solution:
And on hydrolysis CN converts to COOH.
And on hydrolysis CN converts to COOH.
Q7. Chloroxylenol is added to Dettol due to its
Answer : Option A
Explaination / Solution:
It has antiseptic properties.
Q8. The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is
Answer : Option A
Explaination / Solution:
Q9. The equilibrium constant for a reaction is 10. What will be the value of , T = 300 K.
Answer : Option A
Explaination / Solution:
= -RTln K
Q10. Which one of the following conversions involve change in both hybridization and shape?
Answer : Option C
Explaination / Solution:
BF3 has sp2 hybridisation and its shape is triangular planar While BF4- has sp3 hybridisation and shape is tetrahedral.
