CSIR NET Chemical Science Questions.
What is the coordination number of a complex ion with the formula [Ni(H2O)6]2+?
a) 4
b) 6
c) 8
d) 12
Answer: b) 6
Which of the following is an enantiomer of (R)-2-bromobutane?
a) (S)-2-bromobutane
b) 2-bromo-2-methylpropane
c) (R)-2-chlorobutane
d) 2-methyl-2-butanol
Answer: a) (S)-2-bromobutane
The reaction between 2-methyl-1-butene and HBr in the presence of peroxide gives predominantly which of the following products?
a) 2-bromo-2-methylbutane
b) 1-bromo-2-methylbutane
c) 2-bromo-3-methylbutane
d) 2-bromo-2-methylbut-1-ene
Answer: b) 1-bromo-2-methylbutane
What is the formula of the compound formed when potassium metal reacts with chlorine gas?
a) KCl2
b) K2Cl
c) KCl
d) K3Cl
Answer: c) KCl
Which of the following compounds has the highest boiling point?
a) CH3CH2CH2CH3
b) CH3CH2OH
c) CH3CH2CH2OH
d) CH3OCH3
Answer: c) CH3CH2CH2OH
What is the number of unpaired electrons in the ground state of Cr3+?
a) 0
b) 1
c) 2
d) 3
Answer: a) 0
Which of the following compounds will give a positive Fehling's test?
a) 2-propanol
b) Benzene
c) Sucrose
d) Ethyl acetate
Answer: c) Sucrose
Which of the following pairs of molecules are isomers?
a) Butane and 2-methylpropane
b) Propanol and propionaldehyde
c) Ethanol and ethylene oxide
d) Methanol and methyl ether
Answer: a) Butane and 2-methylpropane
Which of the following reactions represents the formation of an acid anhydride from two carboxylic acids?
a) RC(O)OR' + H2O → RCOOH + R'COOH
b) RC(O)OH + R'COCl → RC(O)OCOR' + HCl
c) RCOCl + R'COCl → RC(O)OCOR' + HCl
d) RC(O)OH + R'COOH → RC(O)OCOR' + H2O
Answer: d) RC(O)OH + R'COOH → RC(O)OCOR' + H2O
Which of the following elements has the highest electronegativity?
a) Fluorine
b) Oxygen
c) Nitrogen
d) Carbon
Answer: a) Fluorine
Which of the following statements about the reaction mechanism of an SN1 reaction is correct?
a) The rate-determining step involves the formation of the carbocation intermediate
b) The rate-determining step involves the attack of the nucleophile on the substrate
c) The reaction rate depends on the concentration of both the substrate and the nucleophile
d) The reaction rate depends only on the concentration of the substrate
Answer: a) The rate-determining step involves the formation of the carbocation intermediate
Which of the following is a reducing sugar?
a) Glucose
b) Sucrose
c) Lactose
d) Maltose
Answer: a) Glucose
The amount of Ag+ ion precipitated by adding excess Cl- ion to 1 L of a 0.1 M solution of AgNO3 is:
a) 0.1 mol
b) 0.05 mol
c) 0.02 mol
d) 0.01 mol
Answer: b) 0.05 mol
Which of the following is an example of a linear polymer?
a) Polyethylene
b) Polypropylene
c) Polystyrene
d) Polyvinyl chloride
Answer: a) Polyethylene
Which of the following is an example of a homogeneous catalyst?
a) Platinum in the Haber process
b) Iron in the Haber process
c) Nickel in the hydrogenation of vegetable oils
d) Sulfuric acid in the hydration of ethene
Answer: d) Sulfuric acid in the hydration of ethene
Which of the following is a resonance structure of benzene?
a)
b)
c)
d)
Answer: c)
Which of the following compounds has the highest boiling point?
a) HCl
b) HF
c) HBr
d) HI
Answer: b) HF
Which of the following statements about oxidation-reduction reactions is correct?
a) In a redox reaction, oxidation is always accompanied by reduction
b) In a redox reaction, reduction is always accompanied by oxidation
c) In a redox reaction, both oxidation and reduction occur simultaneously
d) In a redox reaction, neither oxidation nor reduction occurs
Answer: b) In a redox reaction, reduction is always accompanied by oxidation
Which of the following is an example of an electrophile?
a) H2O
b) NH3
c) BF3
d) CH4
Answer: c) BF3
Which of the following is a conjugate acid-base pair?
a) HCl and H2O
b) H2O and OH-
c) HNO3 and NO3-
d) NH3 and NH4+
Answer: d) NH3 and NH4+
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