Chemistry - Online Test
Q1. Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in
Answer : Option C
Explaination / Solution:
If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.
Q2. Macromolecules are one of the following
Answer : Option A
Explaination / Solution:
Polymers are higher molecular weight macromolecules.
Q3. Elements having +5 oxidation state is
Answer : Option D
Explaination / Solution:
The maximum oxidation state shown by a p-block element is equal to
the total number of valence electrons (i.e., the sum of the s and
p-electrons).
Q4. Thermodynamics is the branch of physical science concerned with
Answer : Option A
Explaination / Solution:
Thermodynamics deals with heat and its transformation from one form to another.
The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Q5. Metals which occur in native state in nature
Answer : Option B
Explaination / Solution:
Least reactive metals are found in native state.
Q6. Chemistry does not play a major role in
Answer : Option C
Explaination / Solution:
Chemistry does not deal in explaining superconductivity.
*In superconducting materials the charecteristics of superconductivity appear when the temperature is lowered below a critical temperature.
*The onset of superconductivity is accompanied by abrupt changes in physical properties which are more related to phase transitions of the material .
These aspects of studies in properties of materials are better related to studies in the fields of Physics , eventhough principles involved in Chemistry & Physics go hand to hand.
Q7. According to Dalton’s atomic theor
Answer : Option A
Explaination / Solution:
Dalton was developed the theory of the structure of matter and this theory is known as Dalton’s atomic theory. His research was based on experiments and also from law of chemical combination. Dalton’s atomic theory was quickly explained the many heretofore unexplained chemical phenomena. Dalton’s atomic theory quickly became the theoretical foundation in chemistry.
Dalton’s atomic theory stated that:
All the matter is made of atoms which are tiny particles and indivisible.
All the given atom of the element is identical in mass, size, shape, and in other properties.
All different elements have different types of atoms and also different in their mass, size, shape, and in other properties.
All the atom of an element cannot be made or destroyed.
Q8. Chemical species present in the environment are either naturally occurring or generated by human activities. The study of their interaction with and effects on the environment is called as:
Answer : Option C
Explaination / Solution:
Environmental chemistry basically deals with the origin, transport, reaction and effects of various chemical species of natural or human origin in the environment. It is a part of environmental studies that deals with all other aspects and interactions of environment.
Q9. The f – block elements are known as
Answer : Option D
Explaination / Solution:
F block elements are known as inner transition elements.
Q10. IUPAC name of CH3CHO is
Answer : Option B
Explaination / Solution:
CH3CHO is ethanal
