Module 1
The aqueous solution of which of the following compounds is the best conductor of electric current?
Answer: (2)
What is Corrosion?
a) Destruction or deterioration of a material
b) Conversion of metal atoms to metallic ions
c) Conversion of metal ions to metal atoms
d) Destruction of materials involving in the conversion of metal atoms into metal ions
Answer: d
Explanation: Corrosion is a destructive or deterioration of a material because of reaction with its environment. It occurs due to the higher stability of metal ions than the metal atoms.
Nylon threads are made of
Answer: (2)
Which of the following is a greener route to produce ethanal commercially?
a) Catalytic cracking of ethanol
b) Oxidation of ethene with an ionic catalyst
c) Steam reforming of methanol
d) Dehydrogenation of ethylene
Answer: b
Explanation: Ethanal can be prepared by oxidation of ethene, in the presence of an ionic catalyst in an aqueous medium. This is a greener method and gives 90% of yield.
UV SPECTROSCOPY working on which phenomenon ?
A. Absorption
B. Elution
C. A and B
D. None of this
Answer (a)
An increase in the conductivity equivalent of a solid electrolyte with dilution is primarily due to
Answer: (1)
Corrosion of metals is considered as the reverse of extractive metallurgy.
q)True
b) False
Answer: a
Explanation: Extractive metallurgy is a process of conversion of metal ions from the compounded state to metal atoms in the elemental state, whereas the corrosion occurs by the conversion of metal atoms into metal ions.
Which of the following is a branched polymer?
Answer: (1)
Name the conventional solvent that was used for dry cleaning purposes which later confirmed to be a suspected carcinogen.
a) Supercritical CO2
b) Phenanthrene
c) Tetrachloroethene
d) Benzene aldehyde
Answer: c
Explanation: Tetrachloroethene was used as a solvent for dry cleaning purposes. It is a suspected carcinogen and groundwater contaminant. It is replaced by greener solvent like supercritical CO2.
Ultra Violet spectroscopy wavelength is ?
A. 200 nm to 300nm
B. 200nm to 400nm
C. 400nm to 800 nm
D. All of the above
Answer (b)
The equivalent conductance of Ba2+ and Cl– are respectively 127 and 76 ohm-1 cm-1 eq-1 at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be
Answer: (1)
3. The chemical formula of rust is ______
a) Fe1O
b) Fe2O3
c) Fe3O4
d) Fe(OH)2
Answer: b
Explanation: Corrosion of Iron is generally known as rusting. The chemical reaction can be represented as 4Fe + 3O2 ==> 2Fe2O3.
The process of heat softening, moulding and cooling to rigidness can be repeated for which plastics?
Answer: (1)
Which of the following is not a principle of Green Chemistry?
a) Green solvents and auxiliaries
b) Use of renewable feedstock
c) Hazardous chemical synthesis
d) Design for energy efficiency
Answer: c
Explanation: Synthetic methods should avoid using or generating substances toxic to humans and/or the environment. Hence less hazardous chemical synthesis is an important principle.
Visible spectroscopy wavelength range is ?
A. 200 nm to 300nm
B. 200nm to 400nm
C. 400nm to 800 nm
D. All of the above
Answer(c)
When heating one end of a metal plate, the other end gets hot because of
Answer: (3)
Which of the following methods is not used for the prevention of corrosion?
Answer: (4)
The polymer used in making hair synthetic hair wigs is mage up of
Answer: (1)
Green chemistry is the design of chemical products and processes that reduce or eliminate the use and generation of hazardous substances. Identify the technique used in this area.
a) Bioamplification
b) Polymer manufacturing
c) Pesticide synthesis
d) Use of sunlight and Microwave-assisted reaction
Answer: d
Explanation: Photochemical reaction occurs when light energy gets absorbed by a substances’ molecule. It is a green route as no byproduct will be formed. Vitamin D3 synthesis is assisted by a photochemical reaction.
In uv SPECTROSCOPY water show peak on which λmax ?
A. 191 nm
B. 300 nm
C. 400 nm
D. 500 nm
Answer (a)
The weight of silver displaced by a quantity of electricity which displaces 5600ml of O2 at STP will be
Answer: (4)
Elements which have properties of metals and nonmetals are
Answer: (3)
In addition polymer, monomer used is
Answer: (1)
Which of the following gas was traditionally used to bleach paper?
a) Sulfur
b) Carbon dioxide
c) Chlorine
d) Fluorine
Answer: c
Explanation: Chlorine gas was used to bleach paper. It has good oxidizing properties. Nowadays H2O2 with a suitable catalyst is used for bleaching purposes as it does not contaminate groundwater.
Which statement is false about Chromophore ?
A. It is co-valent unsaturated compound.
B. It is contain π electron.
C. They required high energy for electron transition.
D. They required low energy for electron transition.
Answer (c)