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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Seven
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
The tertiary nitro compound is ___________
2-nitropropane
1-nitropropane
1-nitro-2, 2-dimethyl propane
2-nitro-2-methyl propane
2.
The compound which gives an oily nitrosoamine on reaction with nitrous acid at low temperature is ____________
C2H5NH2
(CH3)2NH
(CH3)3N
(CH3)2CHNH2
3.
C6H5CHO + Methylamine ⟶ X Y + H2SO4-p amino benzene sulphonic acid. Then X and Y are
Schiff's Base, C6H5NH2
C6H6, C6H5CHO
benzal- N - methyl amine, Toluene
None of these
4.
Which among the following will from significant amount of meta isomer on nitration?
5.
Name the sugar present in RNA.
D-ribose
2'-deoxy -D-ribose
D-raffinose
D-glucose
6.
Sucrose on hydrolysis gives
maltose
glucose and fructose
2 molecules of maltose
starch
7.
\({ CH }_{ 3 }{ CH }_{ 2 }OH\overset { { K }_{ 2 }{ C }3_{ 3 }{ O }_{ 7 }/{ H }^{ + } }{ \longrightarrow } \underline { 'X' } +{ H }_{ 2 }O'X'\) is _______.
CH3CHO
CH3COCH3
CH3COOCH3
CH3CN
8.
On fusion with KOH benzophenone undergoes __________, and gives potassium benzoate and ________.
disproportionation reaction, toluene
condensation reaction, toluene
disproportionation reaction, benzene
condensation reaction, benzene
9.
Acetone reacting with HCN to form cyanohydrin is ________ type of reaction.
Nucleophilic addition
Electrophilic substitution
Freeradical substitution
Redox
10.
A compound 'X' when mixed with ethanol and a drop of concentrated H2SO4 gave a compound with fruity odour. Identify 'X'.
HCHO
CH3OH
CH3COOH
CH3NH2
11.
The function of FeCl3 in the conversion of Fe(OH)3 precipitate into a colloid is_________.
peptising agent
emulsifying agent
reducing agent
precipitating agent
12.
_____ is an example of O/W type emulsion.
butter
cream
milk
curd
13.
Among the following compounds strongest acid is _______.
HC≡CH
C6H6
C2H6
CH3OH
14.
The major product obtained when phenol is treated with sodium hydroxide and carbon di oxide is _______.
Salicyaldehyde
Salicylic acid
benzaldehyde
benzoic acid
15.
Which of the following has an offensive odour?
Phenol
Benzy lalcohol
Acrolein
Benzyl benzoate
16.
Alcohols are isomeric with ______.
aldehyde
ketones
ethers
esters
17.
p-Nitrophenol is having lower pKa value than phenol because ______.
phenol is more acidic than p-nitro phenol
anion of p-nitro phenol is more stabilised by resonance than that of phenol.
degree of ionisation of p-nitro phenol is less than that of phenol
anion of p-nitro phenol is less stable than that of phenol.
18.
The above reaction is called ______.
Gattermann reaction
Williamson ether synthesis
Swern's reaction
Riemer tiemann reaction
19.
| Electrolyte | KCl | KNO3 | HCl | NaOAC | NaCl |
| Λ- (Scm2 mol-1) |
149.9 | 145.0 | 426.2 | 91.0 | 126.5 |
Calculate ΛoHoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25oC_______.
517.2
552.7
390.7
217.5
20.
If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is______.
Zero
one
Fraction
none
21.
If ‘a’ is the length of the side of the cube, the distance between the body centered atom and one corner atom in the cube will be_________.
\(\left( \cfrac { 2 }{ \sqrt { 3 } } \right) a\)
\(\left( \cfrac { 4 }{ \sqrt { 3 } } \right) a\)
\(\left( \cfrac { \sqrt { 3 } }{ 4 } \right) a\)
\(\left( \cfrac { \sqrt { 3 } }{ 2 } \right) a\)
22.
Formula of tris(ethane-1, 2-diamine)iron(II)phosphate _______.
[Fe(CH3-CH(NH2)2)3](PO4)3
[Fe(H2N-CH2-CH2-NH2)3](PO4)
[Fe(H2N-CH2-CH2-NH2)3](PO4)2
[Fe(H2N-CH2-CH2-NH2)3]3(PO4)2
23.
Which of the following compounds is colourless?
Fe3+
Ti4+
Co2+
Ni2+
24.
Duralumin is an alloy of ______.
Cu, Mn
Cu, Al, Mg
Al, Mn
Al, Cu, Mn, Mg
25.
Electrochemical process is used to extract_______.
Iron
Lead
Sodium
silver
1.
(d)
2-nitro-2-methyl propane
2.
(b)
(CH3)2NH
3.
(a)
Schiff's Base, C6H5NH2
4.
(b)
5.
(a)
D-ribose
6.
(b)
glucose and fructose
7.
(a)
CH3CHO
8.
(c)
disproportionation reaction, benzene
9.
(a)
Nucleophilic addition
10.
(c)
CH3COOH
11.
(a)
peptising agent
12.
(d)
curd
13.
(d)
CH3OH
14.
(b)
Salicylic acid
15.
(c)
Acrolein
16.
(c)
ethers
17.
(b)
anion of p-nitro phenol is more stabilised by resonance than that of phenol.
18.
(b)
Williamson ether synthesis
19.
(ΛoHoAC) = [(Λo)HCl + Λo)NaOAC ] - (Λo)NaCl
= (426.2 + 91) - (126.5)
= 390.7
20.
t1/2 α \(\frac{1}{[A_{0}]^{n-1}}\)...(1)
If [A0 = 2[A0]; then t1/2 = 2t1/2
2t1/2 α \(\frac{1}{[2A_{0}]^{n-1}}\)...(2)
(2)/(1) = \(2= \frac{1}{[2A_{0}]^{n-1}} \times \frac{1}{[A_{0}]^{n-1}}\)
\(2= \frac {[2A_{0}]^{n-1}} {[A_{0}]^{n-1}}\)
\(2= \frac {1} {2}^{n-1}\)
2 = (2-1)n-1
21 = (2-n+1)
n = 0
21.
If a is the length of the side, then the length of the leading diagonal passing through the body centered atom is \(\sqrt{3a} \)
Required distance = \(\left( \cfrac { \sqrt { 3 } }{ 2 } \right) a\)
22.
[Fe(H2N-CH2-CH2-NH2)3]3(PO4)2
[Fe(en)3]2+(\(PO_{4}^{3-}\))
23.
(b)
Ti4+
24.
(d)
Al, Cu, Mn, Mg
25.
(c)
Sodium
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