Chemistry - Online Test
Q1. Calculate the hydrogen ion concentration in the human blood whose pH is 7.38.
Answer : Option A
Explaination / Solution:
pH=-log[]
Q2. n-propyl bromide on treating with alcoholic KOH produces
Answer : Option C
Explaination / Solution:
Elimination reaction takes place.
Q3. The slag obtained during the extraction of copper from copper pyrites is composed of
Answer : Option D
Explaination / Solution:
FeO is present as impurity and SiO2 is flux added.
Q4. Laughing gas is
Q5. London forces are present in
Answer : Option B
Explaination / Solution:
London Forces are present in non polar molecular solids.
Q6. Rubber tree is found in
Answer : Option C
Explaination / Solution:
Rubber tree is found in India.
Q7. Consider the elements: Cs, Ne, I and F. Identify the element which exhibits neither the negative nor does the positive oxidation state.
Answer : Option B
Explaination / Solution:
Ne is a noble gas, so does not show any positive or negative oxidation state.
Q8. In terms of period and group where would you locate the element with
Z=114
in the modern periodic table?
Answer : Option C
Explaination / Solution:
Elements with atomic numbers Z = (87−114) are placed in 7th period.
Thus , the element with
Z=114(Flerovium) is placed in 7th period and 14th group of the modern periodic table.
Q9. Carbon dioxide in the oceans can be used by:
Answer : Option C
Explaination / Solution:
Carbon dioxide in the oceans can be used by Phytoplankton which are autotrophic components of plankton community.
Q10.
he commonly occurring isotopes of carbon atoms are: 612C, 613C, 614C . They contain:
Answer : Option C
Explaination / Solution:
Isotopes are atoms with the same number of protons but that have a different number of neutrons.
Atomic number of carbon = 6
So number of protons in each isotope = 6
Number of neutrons in = 12-6= 6
Number of neutrons in = 13-6= 7
Number of neutrons in = 14-6= 8
