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Quiz 1
Mdcat-past-papers - IBA - Chemistry Quiz
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Board: IBA | Subject: Chemistry |
1. The heat of formation of CO and CO₂ are -26.4 Kcal and -94.0 Kcal respectively. The heat of combustion of carbon monoxide according to Hess's Law will be:
+26.4Kcal
-67.6Kcal
+94.0Kcal
-120.4Kcal
2. Rate of dehydration of alcohol is:
3°>2°>1°
1°>3°>2°
2°>3°>1°
3°>1°>2°
3. For which reaction, the value of Kc increases with increase in temperature?
CH₄ + O₂ → CO₂ + H₂O
NaOH + HCl → NaCl + H₂O
2SO₂ + O₂ → 2SO₃
H₂ + I₂ → 2HI
4. Correct order of bond energy will be:
HCl>HBr>HI
HBr>HCl>HI
HI>HCl>HBr
HCl>HI>HBr
5. Which of the following is least volatile?
Glycerol
Water
Acetic acid
Diethyl ether
6. IUPAC name of the compound is CH₃(CH₂)₆CH(CH₂):
2-methylheptane
3-methylheptane
4-methylheptane
Octane
7. IUPAC name of the compound C₂H₅CH=C(C₃H₅) C₂H₅ is:
1-2-diethyl-2-propylethene
3-ethylhept-3-ene
4-ethylhept-3-ene
4-ethylhept-2-ene
8. Which of the following molecules have similar molecular shape?
NH₃ & AlCl₃
BCl₃ & NH₃
AlCl₃ & PCl₃
H₂O & SnCl₂
9. Value of electronegativity of atoms A and B are 1.20 and 4.0 respectively, the percent ionic character will be:
43%
50%
55%
73%
10. Phenol differs from ethanol because it:
Forms stronger hydrogen bonds to its aromatic ring
Is more acidic because of resonance stabilized conjugate base
Readily undergoes nucleophilic substitution at the -OH group
Is completely insoluble in water due to its benzene ring
11. Which reagent and condition are used to bring about the reaction shown? Toluene → p-chloro toluene
Cl₂ in the dark
Cl₂ in the presence of AlCl₃
Cl₂ in the presence of UV light
Concentrated HCl heated under reflux
12. What is 50% yield when actual yield and theoretical yield are 2 g and 4 g respectively?
25%
50%
75%
85%
13. IUPAC name of CHCCI is:
Chloroethane
Chloroethyne
Chloroethene
Ethylchloride
14. The order of reactivity of following R-X for SX reaction is:
RF>RCl>RBr>RI
RBr>RF>RCl>RI
RCl>RF>RBr>RI
RI>RBr>RCl>RF
15. Among the following compounds, the most susceptible to nucleophilic attack on carbonyl carbon is:
CH3COCl
CH3CHO
CH3COOCH₃
CH3COOCOCH₃
16. Which of the following is expected to be the most paramagnetic?
Li
Be
B
C
17. The formation of activated complex in a reaction is:
Exothermic process
Endothermic process
Either endo or exo
Always energy released
18. The maximum probability of finding an electron is at a distance of:
0.53 nm
0.35 nm
0.053 nm
0.0053 nm
19. The IUPAC name of Vinyl acetylene is:
But-1-en-3-yne
But-3-en-1-yne
Pent-3-en-1-yne
Pent-2-en-4-yne
20. Which atom has at least single electron in dumbell shape orbital?
H
He
Li
B
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