By QB365 on 31 Dec, 2022
QB365 provides a detailed and simple solution for every Possible Questions in Class 11 Chemistry Subject - Important 1 Mark MCQ's, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
11th Standard
Chemistry
Answer All The Questions
40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is _______.
40 ml CO2 gas
40 ml CO2 gas and 80 ml H2O gas
60 ml CO2 gas and 60 ml H2O gas
120 ml CO2 gas
1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________.
0%
4.4%
16%
8.4%
Total number of electrons present in 1.7 g of ammonia is _____.
6.022\(\times\)1023
\(\frac { 6.022\times { 10 }^{ 22 } }{ 1.7 } \quad \)
\(\frac { 6.022\times { 10 }^{ 24 } }{ 1.7 } \)
\(\frac { 6.022\times { 10 }^{ 23 } }{ 1.7 } \)
The energy of light of wavelength 45 nm is _____________.
6.67 x 1015J
6.67 x 1011J
4.42 x 10-18J
4.42 x 10-15J
Two electrons occupying the same orbital are distinguished by ___________
azimuthal quantum number
spin quantum number
magnetic quantum number
orbital quantum number
Electron density in the yz plane of 3dxy orbital is ___________
zero
0.50
0.75
0.90
Assertion: Number of radial and angular nodes for 3p orbital are 1, 1 respectively.
Reason: Number of radial and angular nodes depends only on principal quantum number.
both assertion and reason are true and reason is the correct explanation of assertion.
both assertion and reason are true but reason is not the correct explanation of assertion.
assertion is true but reason is false
both assertion and reason are false
The electronic configuration of the elements A and B are 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is ___________
AB
AB2
A2B
none of the above
Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy _______________.
Al < O < C < Ca < F
Al < Ca < O < C < F
C < F < O < Al < Ca
Ca < Al < C < O < F
Which of the following statements about hydrogen is incorrect?
Hydrogen ion, H3O+ exists freely in solution.
Dihydrogen acts as a reducing agent.
Hydrogen has three isotopes of which tritium is the most common.
Hydrogen never acts as cation in ionic salts.
Zeolite used to soften hardness of water is hydrated _____________
Sodium aluminium silicate
Calcium aluminium silicate
Zinc aluminium borate
Lithium aluminium hydride
Which of the following compounds will not evolve H2 gas on reaction with alkali metals ?
ethanoic acid
ethanol
phenol
none of these
Which is the correct sequence of solubility of carbonates of alkaline earth metals ?
BaCO3 > SrCO3 > CaCO3 > MgCO3
MgCO3 > CaCO3 > SrCO3 > BaCO3
CaCO3 > BaCO3 > SrCO3 > BaCO3
BaCO3 > CaCO3 > SrCO3 > MaCO3
Which of the following is the correct expression for the equation of state of van der Waals gas?
\(\left( P+\frac { a }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT\)
\(\left( P+\frac { na }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT\)
\(\left( P+\frac { { an }^{ 2 } }{ { V }^{ 2 } } \right) (V-nb)=nRT\)
\(\left( \frac { P+{ n }^{ 2 }{ a }^{ 2 } }{ { V }^{ 2 } } \right) (V-ab)=nRT\)
The table indicates the value of van der Waals constant 'a' in (dm3)2 atm. mol-2.
Gas | O2 | N2 | NH3 | CH4 |
a | 1.360 | 1.390 | 4.170 | 2.253 |
The gas which can be most easily liquefied is ______________
O2
N2
NH3
CH4
In an adiabatic process, which of the following is true ?
q = w
q = 0
ΔE = q
PΔV= 0
The bond dissociation energy of methane and ethane are 360 kJ mol-1 and 620 kJ mol-1 respectively. Then, the bond dissociation energy of C-C bond is ______________.
170 kJ mol-1
50 kJ mol-1
80 kJ mol-1
220 kJ mol-1
At a given temperature and pressure, the equilibrium constant values for the equilibria
\({ 3A }_{ 2 }+{ B }_{ 2 }+2C\overset { { K }_{ 1 } }{ \rightleftharpoons } { 2A }_{ 3 }BC\) and
\({ A }_{ 3 }BC\overset { { K }_{ 2 } }{ \rightleftharpoons } 3/2\left[ { A }_{ 2 } \right] +\frac { 1 }{ 2 } { B }_{ 2 }+C\)
The relation between K1 and K2 is ___________
\(K_1={1\over \sqrt{K_2}}\)
\(K_2=K_1^{-1/2}\)
\(K_1^2=2K_2\)
\({K_1\over 2}=K_2\)
In the equilibrium,
2A(g) ⇌ 2B(g) + C2(g)
the equilibrium concentrations of A, B and C2 at 400 K are 1\(\times\)10–4 M, 2.0 \(\times\)10–3 M, 1.5 \(\times\)10–4 M respectively. The value of KC for the equilibrium at 400 K is ________
0.06
0.09
0.62
3 x 10-2
The equilibrium constants of the following reactions are:
N2 + 3H2 ⇌ 2NH3 : | K1 |
N2 + O2 ⇌ 2NO : | K2 |
H2 + ½O2 ⇌ H2O : | K3 |
The equilibrium constant (K) for the reaction ;
\({ 2NH }_{ 3 }+5/2{ O }_{ 2 }\overset { K }{ \rightleftharpoons } 2NO+{ 3H }_{ 2 }{ O },\) will be
\(K_2^3{K_3\over K_1}\)
\(K_1{K_3^3\over K_2}\)
\(K_2{K_3^3\over K_1}\)
\(K_2{K_3\over K_1}\)
Osometic pressure (p) of a solution is given by the relation ____________
= nRT
V = nRT
\(\pi\)RT = n
none of these
The correct equation for the degree of an associating solute, 'n' molecules of which undergoes association in solution, is _____________
\(\alpha=\frac{n(i-1)}{n-1}\)
\(\alpha^2=\frac{n(1-i)}{(n-1)}\)
\(\alpha=\frac{n(i-1)}{1-\mathrm{n}}\)
\(\alpha=\frac{n(1-i)}{n(1-i)}\)
Which one of the following is diamagnetic ?
O2
\(O_2^{2-}\)
\(O_2^+\)
None of these
IUPAC name of \({ CH }_{ 3 }-\overset { \underset { | }{ H } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -\overset { \underset { | }{ { C }_{ 4 }{ H }_{ 9 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }\) is ________
3, 4, 4 – Trimethylheptane
2 – Ethyl –3, 3– dimethyl heptane
3, 4, 4 – Trimethyloctane
2 – Butyl -2 –methyl – 3 – ethyl-butane
The size of isoelectronic species- F-, Ne and Na+ is affected by _____________
nuclear charge (Z)
valence principal quantum number (n)
electron-electron interaction in the outer orbitals
none of the factors becausetheir size is the same
Considering the elements F, CI, O and N, the correct order of their chemical reactivity in terms of oxidizing property is_____
F > CI > O > N
F > O > CI > N
CI > F > O > N
0 > F > N > CI
Which one of the following is used to build the beam pipe in accelerators?
Be
Ca
Mg
Sr
Beryllium is _________ in nature.
paramagnetic
diamagnetic
ferromagnetic
none
The compressibility factor for an ideal gas is ______________.
1.5
2
1
\(\propto \)
The rate of diffusion of a gas is ____________.
directly proportional to its density
directly proportional to its molecular mass
directly proportional to its square root of its molecular mass
inversely proportional to its square root of its molecular mass
How many structural isomers are possible for the molecular formula C4H8 which can undergo ozonolysis?
2
4
3
1
2-butene shows geometrical isomerism due to ________
Restricted rotation about double bond
Free rotation about double bond
Free rotation about single bond
Chiral carbon
Consider the following statements.
(i) The process of reduction using sodium in liquid ammonia is called as Birch reduction.
(ii) Birch reduction is stereospecific in reaction.
(iii) Alkynes can be reduced to cis - alkenes using Birch reduction. Which of the above statement is/are correct?
(i) and (ii)
(ii) and (iii)
(iii) only
(ii) only
Fine the odd one out:
Benzene
Ethane
Ethene
Propyne
\(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}+\mathrm{H}_{2} \stackrel{\mathrm{Pt}}{\longrightarrow} ?\)
CH3 - CH2 - CH2 - CH3
CH3 CH2 CH3
CH3 CH = CH2
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } H-{ CH }_{ 2 }\)
The type of substitution reaction that takes place when methane, is treated with Cl2 in presence of light is _____.
ionic
electrophilic
nucleophilic
radical
C6 - C12 are used as _____.
lubricants
petrollium jelly
diesel fuels
gasoline
The colour of Br2 / H2O is _____.
orange
green
reddish yellow
reddish brown
Propylene is treated with ozone to give _____.
HCHO + CH3CHO
HCHO + CH3COOH
CH3COCH3
CH3COCH3 + CH3COOH
Polystyrene is used in _____.
foam cups
toys
flexible items
yars
In alkynes the % of s - Character in sp hybrid orbital is ____.
50%
55%
33%
25%
According to Huckel's rule presence of _______ electrons in the ring, which is explained by Aromaticity.
(4n+2)
(4n+3)\(\sigma\)
(4n+2)\(\pi\)
(2n+1)\(\pi\)
Benzene is in involved in _______ reaction.
Nucleophilic substitution
electrophilic substitution
Elimination
None
______ shaped polynuclear hydrocarbon are much more toxic & carcinogenic.
T
H
A
L
The best reagent for converting an alcohol into the corresponding chloride is
PCl3
PCl5
SOCl2
HCl/ZnCl2
Which of the following is secondary alkyl halide?
Iso butyl chloride
Isopentyl chloride
Neopentyl chloride
Isopropyl chloride
Which one of the following react with gringnard reagent followed by hydrolysis will yield primary alcohol?
CH3CHO
HCHO
CH3COCH3
CO2
\(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~N}_{2} \mathrm{Cl}+\stackrel{\mathrm{Warm}}{\longrightarrow} ?\)
C6H5I
C6H5Kl
C6H6
C6H5OH
Identify the component of photechemical smog which is not the common one.
Acrolein
Ozone
Peroxyacetyl nitrate
CFCs
'DO' value of a water sample is 6 ppm. Calculate the weight of dissolved oxygen present in 100 kg of water sample?
0.9 g
0.6 g
0.1 g
0.5 g
Answers
40 ml CO2 gas
16%
6.022\(\times\)1023
4.42 x 10-18J
spin quantum number
zero
assertion is true but reason is false
AB2
Ca < Al < C < O < F
Hydrogen has three isotopes of which tritium is the most common.
Sodium aluminium silicate
none of these
MgCO3 > CaCO3 > SrCO3 > BaCO3
\(\left( P+\frac { { an }^{ 2 } }{ { V }^{ 2 } } \right) (V-nb)=nRT\)
NH3
q = 0
80 kJ mol-1
\(K_2=K_1^{-1/2}\)
0.06
\(K_2{K_3^3\over K_1}\)
V = nRT
\(\alpha=\frac{n(i-1)}{1-\mathrm{n}}\)
\(O_2^{2-}\)
3, 4, 4 – Trimethyloctane
nuclear charge (Z)
F > O > CI > N
Be
diamagnetic
1
inversely proportional to its square root of its molecular mass
3
Restricted rotation about double bond
(i) and (ii)
Benzene
CH3 CH2 CH3
radical
gasoline
reddish brown
HCHO + CH3CHO
foam cups
50%
(4n+2)\(\pi\)
electrophilic substitution
L
SOCl2
Isopropyl chloride
HCHO
C6H5I
CFCs
0.6 g