Chemistry - Online Test
Q1. The flow of current is possible in Daniel cell only
Answer : Option B
Explaination / Solution:
The flow of current is possible only due to potential difference.
Q2. Yellow colour of NaCl crystals in sodium vapour is due to
Answer : Option D
Explaination / Solution:
It’s a F center defect.
Q3. Some polymers are called thermoplastic polymers because
Answer : Option C
Explaination / Solution:
Thermoplastic polymer get soften on heating and gets harden on cooling.
Q4. Fluorine reacts with H2S to produce
Answer : Option C
Explaination / Solution:
3F2+ H2S→SF4+ 2HF
Q5. Entropy is a state function and measures
Answer : Option A
Explaination / Solution:
Entropy is a state function and it is measure of randomness of a system.
Q6. Liquation method is used for the metals which have
Answer : Option D
Explaination / Solution:
Liquification is purification technique used for metals having low melting points.
Q7. Metalloids show the properties of
Answer : Option C
Explaination / Solution:
A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them. Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Chemically, they behave mostly as nonmetals. They can form alloys with metals. Most of their other physical and chemical properties are intermediate in nature. The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium.
Q8. Due to the presence of electrons in the inner shells, the electron in the outer shell will not experience the full positive charge of the nucleus (Ze). This is known as
Answer : Option A
Explaination / Solution:
Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. It is also referred to as the screening effect (or) atomic shielding.
Q9. This process in which nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity, is called as :
Answer : Option A
Explaination / Solution:
Eutrophication is the process in which nutrient enriched water bodies support a dense plant population, which kills animal life by consuming oxygen and depriving them of it.
Q10. Zr and Hf have almost equal atomic and ionic radii because
Answer : Option A
Explaination / Solution:
Due to presence of Lanthanide series in which electron enter f orbital which have poor shielding effect size of 5d series and 4d series doesnot change much . this is known as lanthanide contraction.
