Chemistry - Online Test
Q1. Maximum number of electrons occupied by s,p and d orbitlas are:
Answer : Option A
Explaination / Solution:
s-orbital ml=0, so it can accommodate 2 electron.
p-orbital has ml = -1,0,+1. It can accommodate 6 electrons.
d-orbital has ml = -2,-1,0,1,2.It can accommodate 10 electrons.
Q2. Quantum mechanics is a theoretical science that deals with the study of the
Answer : Option A
Explaination / Solution:
quantum mechanics, science dealing with the behaviour of matter and light on the atomic and subatomic scale. It attempts to describe and account for the properties of molecules and atoms and their constituents—electrons, protons, neutrons, and other more esoteric particles such as quarks and gluons. These properties include the interactions of the particles with one another and with electromagnetic radiation (i.e., light, X-rays, and gamma rays).
Q3. Green plants reduce environmental pollution by :
Answer : Option D
Explaination / Solution:
Green plants help reduce environmental pollution by removing the excess of CO2 by using it in photosynthesis for making their food.
Q4. Which of the following ion has smallest radii?
Answer : Option A
Explaination / Solution:
In period when we move from left to right in a period atomic radii 1st decreases till nickel then starts increasing so Ni2+ has smallest radii.
Q5. An empirical formula represents the simplest
Answer : Option C
Explaination / Solution:
In chemistry the empirical formula of a compound is the simplest positive integer ratio of atoms present in a compound.
However ,this differs from the chemical formula which expresses the number of atoms in each molecule of a compound ..
An empirical formula makes no mention of the arrangement of atoms in a compound.
It is standard for many ionic compounds like CaCl2 or for macro - molecules such as silicates etc.
Q6. Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.
Answer : Option A
Explaination / Solution:
Alcohols have higher boiling points than aldehydes.
Q7. Ammonia(
Answer : Option B
Explaination / Solution:
Dihydrogen under certain reaction conditions combines with almost all elements except noble gases to form compounds called hydrides. Electron –rich hydrides, as the name suggest, are compounds of hydrogen with other elements that have excess electrons present as lone-pairs.
For example ammonia –NH3 is a hydride of nitrogen that has one lone pair, water (H2O) is a hydride of oxygen that has two lone pairs etc. As these are electron rich species, they can donate electrons that is they are lewis bases.
Q8. The antibiotic effective against certain strains of cancer cells is
Answer : Option B
Explaination / Solution:
Dysidazin is effective against strains of cancer cell.
Q9. Effective atomic number of Fe in the complex K4[Fe(CN)6] is
Answer : Option B
Explaination / Solution:
26+2(6)-2=36
Q10. Charge on one mole of electrons - Faraday is approximately
Answer : Option B
Explaination / Solution:
Charge on one electron is 1.6 x C. 1 mole of electron 6.023x electrons. So charge on one electron is 1.6 x x 6.023 x = 96500 C
