Row_ID
int64 1
30.2M
| Topic
stringclasses 3
values | Subtopic
stringclasses 4
values | Question
stringclasses 13
values | Answer_1
stringclasses 11
values | Explanation_1
stringclasses 12
values | Answer_2
stringclasses 11
values | Explanation_2
stringclasses 11
values | Answer_3
stringclasses 0
values | Explanation_3
stringclasses 0
values | Difficulty
stringclasses 2
values |
|---|---|---|---|---|---|---|---|---|---|---|
3,901 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,902 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,903 |
Organic Chemistry
|
Alkenes
|
HCl+1-methylcyclohexene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,904 |
Organic Chemistry
|
Alkenes
|
HBr+2-methylpropene product?
|
unknown
|
HBr adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,905 |
Organic Chemistry
|
Alkenes
|
HBr+1-butene product?
|
2-bromobutane
|
HBr adds; yields 2-bromobutane.
|
sec-butyl bromide
|
Same: sec-butyl bromide.
| null | null |
Hard
|
3,906 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,907 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,908 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,909 |
Organic Chemistry
|
Alkenes
|
HBr+1-methylcyclohexene product?
|
1-bromo-1-methylcyclohexane
|
HBr adds; yields 1-bromo-1-methylcyclohexane.
|
1-methyl-1-bromocyclohexane
|
Same: 1-methyl-1-bromocyclohexane.
| null | null |
Hard
|
3,910 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,911 |
Organic Chemistry
|
Alkenes
|
HCl+1-methylcyclohexene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,912 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,913 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,914 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,915 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,916 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,917 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,918 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,919 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,920 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,921 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,922 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,923 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,924 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,925 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,926 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,927 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,928 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,929 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,930 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,931 |
Organic Chemistry
|
Alkenes
|
HCl+1-butene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,932 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,933 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,934 |
Organic Chemistry
|
Alkenes
|
HCl+1-methylcyclohexene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,935 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,936 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,937 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,938 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,939 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,940 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,941 |
Organic Chemistry
|
Alkenes
|
HCl+2-methylpropene product?
|
2-chloro-2-methylpropane
|
HCl adds; yields 2-chloro-2-methylpropane.
|
tert-butyl chloride
|
Same: tert-butyl chloride.
| null | null |
Hard
|
3,942 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,943 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,944 |
Organic Chemistry
|
Alkenes
|
HCl+2-methylpropene product?
|
2-chloro-2-methylpropane
|
HCl adds; yields 2-chloro-2-methylpropane.
|
tert-butyl chloride
|
Same: tert-butyl chloride.
| null | null |
Hard
|
3,945 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,946 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,947 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,948 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,949 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,950 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,951 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,952 |
Organic Chemistry
|
Alkenes
|
HCl+1-methylcyclohexene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,953 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,954 |
Organic Chemistry
|
Alkenes
|
HBr+1-butene product?
|
2-bromobutane
|
HBr adds; yields 2-bromobutane.
|
sec-butyl bromide
|
Same: sec-butyl bromide.
| null | null |
Hard
|
3,955 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,956 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,957 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,958 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,959 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,960 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,961 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,962 |
Organic Chemistry
|
Alkenes
|
HBr+2-methylpropene product?
|
unknown
|
HBr adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,963 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,964 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,965 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,966 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,967 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,968 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,969 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,970 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,971 |
Organic Chemistry
|
Alkenes
|
HCl+2-methylpropene product?
|
2-chloro-2-methylpropane
|
HCl adds; yields 2-chloro-2-methylpropane.
|
tert-butyl chloride
|
Same: tert-butyl chloride.
| null | null |
Hard
|
3,972 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,973 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,974 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,975 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,976 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,977 |
Organic Chemistry
|
Alkenes
|
HCl+1-butene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,978 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,979 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,980 |
Organic Chemistry
|
Alkenes
|
HBr+2-methylpropene product?
|
unknown
|
HBr adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,981 |
Organic Chemistry
|
Alkenes
|
HCl+1-butene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,982 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,983 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,984 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,985 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,986 |
Organic Chemistry
|
Alkenes
|
HCl+1-butene product?
|
unknown
|
HCl adds; yields unknown.
|
unknown
|
Same: unknown.
| null | null |
Hard
|
3,987 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.01s^-1?
|
69.3s
|
t1/2=0.693/0.01=69.3s.
|
~70s
|
t1/2≈0.7/0.01=70s.
| null | null |
Hard
|
3,988 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,989 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,990 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,991 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.1s^-1?
|
6.9s
|
t1/2=0.693/0.1=6.9s.
|
~7s
|
t1/2≈0.7/0.1=7s.
| null | null |
Hard
|
3,992 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,993 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
3,994 |
Inorganic Chemistry
|
Oxidation States
|
Co ox.state in [Co(NH3)6]3+?
|
+3
|
[Co(NH3)6]3+: Co=+3.
|
Co(III)
|
+3=III.
| null | null |
Expert
|
3,995 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,996 |
Organic Chemistry
|
Nomenclature
|
Name CH3CH(OH)CH2CHO?
|
3-hydroxybutanal
|
CH3CH(OH)CH2CHO: 3-hydroxybutanal.
|
beta-hydroxybutyraldehyde
|
3-hydroxybutanal=beta-hydroxybutyraldehyde.
| null | null |
Hard
|
3,997 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|
3,998 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.05s^-1?
|
13.9s
|
t1/2=0.693/0.05=13.9s.
|
~14s
|
t1/2≈0.7/0.05=14s.
| null | null |
Hard
|
3,999 |
Physical Chemistry
|
Kinetics
|
t1/2,k=0.02s^-1?
|
34.6s
|
t1/2=0.693/0.02=34.6s.
|
~35s
|
t1/2≈0.7/0.02=35s.
| null | null |
Hard
|
4,000 |
Inorganic Chemistry
|
Oxidation States
|
Fe ox.state in [Fe(CN)6]4-?
|
+2
|
[Fe(CN)6]4-: Fe=+2.
|
Fe(II)
|
+2=II.
| null | null |
Expert
|