Chemistry - Online Test
Q1. Tranquilisers act as antidepressant by
Answer : Option A
Explaination / Solution:
Transquilisers decreases the degradation of noradrenaline.
Q2. What compound is produced when cyclohexene is treated with concentrated KMnO4?
Answer : Option C
Explaination / Solution:
Conc KMnO4 will cause oxidation and ring opening forming adipic acid.
Q3. Enthalpy of sublimation of a substance is equal to
Answer : Option A
Explaination / Solution:
The process of sublimation involves the change of solid into vapour. Though in sublimation a solid does not pass through the liquid phase on its way to the gas phase, the enthalpy change is equal to the sum of enthalpy of fusion and enthalpy of vaporization because enthalpy is a state function.
Q4. When a gas phase atom in its ground state gains an electron. This is called
Answer : Option D
Explaination / Solution:
electron gain enthalpy is the energy released when an electron is gained by isolated gaseous atom to form isolated gaseous anion.
Q5.
Maximum number of molecules of CH3I that can react with a molecule of CH3NH2 is
Answer : Option D
Explaination / Solution:
CH3NH2 can act as nucleophile to cause substitution reaction. (CH3)4N+ this is formed when 3 moles of CH3NH2 reacts with methyl halide.
Q6. The diagonal relationship exists between
Answer : Option A
Explaination / Solution:
element of group and the second element of group exist in diagonal relationship.Due to their nearly same polarizing power
Q7. Why Kjeldahl method cannot be used for the estimation of nitrogen present in DNA and RNA? Choose the most appropriate option.
Answer : Option A
Explaination / Solution:
Nitrogen present in rings, azo groups and nitro groups of DNA and RNA cannot be removed as ammonia
Q8. The temperature coefficient of most of the reactions lies between
Answer : Option C
Explaination / Solution:
For every 100 rise in temperature rate of reaction increases by factor of 2 or 3.
Q9. Which among the following substances is an example of multimolecular colloids?
Answer : Option A
Explaination / Solution:
Multimolecular colloids are formed when a large number of atoms or molecules of a substance aggregate together to form speices having size in colloidal range. sulphur sol contains a thousand of S8 molecules.
Q10. As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?
Answer : Option C
Explaination / Solution:
P α T at constant volume.This is according to Gay Lussac’s law-“ At constant volume, the pressure of a given mass of a gas is directly proportional to its absolute temperature.”
