Chemistry · Question 31
The structural isomerism in which isomers are in dynamic equilibrium with each other is:
- Chain isomerism
- Position isomerism
- Metamerism
- Tautomerism
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Correct answer: D
Tautomerism
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Chemistry · Question 32
For an endothermic reaction at constant pressure, the enthalpy change (ΔH) has which sign?
- Positive
- Negative
- Zero
- Always undefined
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Correct answer: A
Positive
An endothermic reaction absorbs heat from its surroundings, so its enthalpy change is positive.
Chemistry · Question 33
Friedrich prepared UREA from
- Amino Acids
- Ammonium carbonate
- Ammonium cyanate
- xanthin
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Correct answer: C
Ammonium cyanate
Chemistry · Question 34
The number of molecules taking part in rate determining step of a reaction is called as_____________?
- Order of reaction
- Molecularity
- Intermediate
- Substrates
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Correct answer: B
Molecularity
Chemistry · Question 35
Current is electrolysis is carried through
- Free electrons
- Positive Ions
- Negative Ions
- Both B and C
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Correct answer: D
Both B and C
Chemistry · Question 36
Reduction of alkyl halides in the presence of Zn and mineral acid produces ____________?
- Alkenes
- Alkanes
- Alkynes
- Alcohols
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Correct answer: B
Alkanes
Chemistry · Question 37
Which one is a stronger Lewis Base?
- Phenol
- Aniline
- Pyridine
- Both A & 8 have equal strength
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Correct answer: C
Pyridine
Chemistry · Question 38
Which one of the following elements has the largest second ionization energy?
- K
- Ca
- Cl
- Bi
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Correct answer: A
K
Chemistry · Question 39
Which type of bonds are break during cracking?
- C-C
- C-H
- Both C-C and C-H
- C-O
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Correct answer: A
C-C
Chemistry · Question 40
Non-protein part co-factor includes organic & metallic organic molecule & sometimes________________.
- Vitamins
- DNA
- Coenzyme
- None
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Correct answer: A
Vitamins