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Join nowReason [R]. Addition of HBr on alkene proceed by carbocation intermediate
a] Both A and R are true and R is the correct explanation of A
b] Both A and R are true but R is not the correct explanation of A
c] A is true but R is false
d] A is false but R is true
Lý do [R]. Tính chất hóa học của nguyên tử được điều khiển bởi số lượng electron trong nguyên tử
a] Both A and R are true and R is the correct explanation of A
b] Both A and R are true but R is not the correct explanation of A
c] A is true but R is false
d] A is false but R is true
Reason [R]. Both contain 1 g atom of carbon which contains 6. 023 {tex}\times{/tex} 1023 carbon atoms.
a] Both A and R are true and R is the correct explanation of A
b] Both A and R are true but R is not the correct explanation of A
c] A is true but R is false
d] A is false but R is true
Class 11 Chemistry Sample Paper Section B
- 2-methyl -3-isopropyl heptane
- Dicyclopropyl methane
OR
Write equations for the preparation of
- HC {tex}\equiv{/tex} CD and
- DC {tex}\equiv{/tex} CD
Class 11 Chemistry Sample Paper Section C
- Two liters of an ideal gas at a pressure of 10 atm expands isothermally at 25 °C into a vacuum until its total volume is 10 liters. How much heat is absorbed and how much work is done in the expansion?
- Identify the state functions and path functions out of the following
Enthalpy, entropy, heat, temperature, work, free energy - If enthalpy of fusion and enthalpy of vaporisation of sodium metals are 2. 6 and 98. 2 kJ mol-1 respectively, what is the enthalpy of sublimation of sodium?
3C [graphite] + 4H2[g] {tex}\to{/tex} C3H8[g]
{tex}\Delta_fH^o{/tex} for propane, C3H8[g] is – 103. 8 kJ mol-1
Given, {tex}s_m^{\circ}{/tex} C3H8[g] = 270. 2 JK-1mol-1
{tex}s_m^{\circ} C{/tex} [graphite] = 5. 70 JK-1mol-1
and {tex}s_m^{\circ}{/tex} H2[g] = 130. 7JK-1mol-1
- H2S[g] + CI2[g] {tex}\rightarrow{/tex} 2HCl[g] + S[s]
- 3Fe3O4[s] + 8 AI[s] {tex}\rightarrow{/tex} 9 Fe[s] + 4Al2O3[s]
- 2Na [s] + H2[g] {tex}\rightarrow{/tex} 2NaH[s]
He+ [g] {tex}\longrightarrow{/tex} He2+ [g] + e–
The ionization energy for the H atom in the ground state is 2. 18 {tex}\times{/tex} 10-18 J atom.
- its group
- block in which this element would be placed
- IUPAC name and symbol
- What is the molarity [M] of the solution [density of solution = 1. 19 g mL-1]
- What volume required of concentrated HCI is required to make 1. 0 L of an 0. 10 M HCI?
Class 11 Chemistry Sample Paper Section D
IUPAC [International Union of Pure and Applied Chemistry] system of nomenclature. Common names are useful and in many cases indispensable, particularly when the alternative systematic names are lengthy and complicated. A systematic name of an organic compound is generally derived by identifying the parent hydrocarbon and the functional group[s] attached to it. By using prefixes and suffixes, the parent name can be modified to obtain the actual name. In a branched-chain compound, small chains of carbon atoms are attached at one or more carbon atoms of the parent chain. The small carbon chains [branches] are called alkyl groups. An alkyl group is derived from a saturated hydrocarbon by removing a hydrogen atom from carbon. Abbreviations are used for some alkyl groups. For example, methyl is abbreviated as Me, ethyl as Et, propyl as Pr and butyl as Bu
- Draw the structure of 3-Ethyl-4,4-dimethylheptane
OR
Why CH4 after becoming-CH3 called a methyl group?
- How is the numbering in branched chain hydrocarbon done?
- Derive the structure of 2-Chlorohexane
When anions and cations approach each other, the valence shell of anions are pulled towards the cation nucleus and thus, the shape of the anion is deformed. The phenomenon of deformation of anion by a cation is known as polarization and the ability of the cation to polarize the anion is called as polarizing power of cation. Due to polarization, sharing of electrons occurs between two ions to some extent and the bond shows some covalent character
The magnitude of polarization depends upon a number of factors
- Out of AlCl3 and AlI3 which halides show maximum polarization?
- Out of AlCl3 and CaCl2 which one is more covalent in nature?
- The non-aqueous solvent like ether is added to the mixture of LiCl, NaCl and KCl. Which will be extracted into the ether?
OR
Out of CaF2 and CaI2 which one has a minimum melting point?
To practice more questions & prepare well for exams, download myCBSEguide App. It provides complete study material for CBSE, NCERT, JEE [main], NEET-UG and NDA exams. Teachers can use Examin8 App to create similar papers with their own name and logo
Class 11 Chemistry Sample Paper Section E
- What happens to equilibrium constant when temperature increases for a reaction?
- Explain why alkynes are less reactive than alkenes towards addition of Br2
- What is a Lindlars’ catalyst?
- Why do alkynes not show geometrical isomerism?
- Which conformation of ethane is more stable?
- State Le chatelier’s principle
- How is alkene produced by vicinal dihalide?
- Why a reaction proceeds forward when Q < K and no net reaction occurs when Q = K
- Explain the effect of an increase in pressure in terms of reaction quotient Q for the reaction
CO[g] + 3H2[g] {tex} \rightleftharpoons {/tex} CH4[g] + H2O[g]
OR
Ethyl acetate is formed by the reaction of ethanol and acetic acid and the equilibrium is represented as
CH3COOH[l] + C5H5OH[l] {tex}\rightleftharpoons{/tex} CH3COOC2H5[l] + H2O[l]
- Write the concentration ratio [reaction quotient], Qc, for this reaction [note. water is not in excess and is not a solvent in this reaction]
- At 293 K, if one starts with 1. 00 mol of acetic acid and 0. 18 mol of ethanol, there is 0. 171 mol of ethyl acetate in the final equilibrium mixture. Calculate the equilibrium constant
- Starting with 0. 5 mol of ethanol and 1. 0 mol of acetic acid and maintaining it at 293 K, 0. 214 mol of ethyl acetate is found after some time. Has equilibrium been reached?
- Give the IUPAC name of the following compound
{tex}{\text{C}}{{\text{H}}_3} – \mathop {\mathop {{\text{CH}}}\limits_. }\limits_{{\text{Br}}} – \mathop {\mathop {\text{C}}\limits_{. } }\limits_{\text{O}} – \mathop {\mathop {{\text{CH}}}\limits_. }\limits_{{\text{C}}{{\text{H}}_{\text{3}}}} – {\text{C}}{{\text{H}}_3}{/tex} - 0. 12 g of an organic compound containing phosphorous gave 0. 22 g of Mg2P2O7 by usual analysis. Calculate the percentage of phosphorous in the compound
OR
- Which of the two structures CH3COOH and CH3COO– is more stabilized by resonance? Explain
- Will CCl4 give a white precipitate of AgCl on heating it with AgNO3?
Class 11 – Chemistry Sample Paper Solution [2023-24]
Class 11 Chemistry Sample Paper Solution Section A
- [b] 4. 7g
Explanation. Mass = Density {tex}\times{/tex} Volume
= 3. 12 g mL-1 {tex}\times{/tex} 1. 5 mL = 4. 68 g = 4. 7 g
significant figures as that of the least given number. Therefore, correct answer is 4. 7 g - [d] charge on the electrons
Explanation. The oil drop experiment was performed by Robert A. Millikan and Harvey Fletcher in 1909 to measure the elementary electric charge [the charge of the electron]. The experiment entailed observing tiny electrically charged droplets of oil located between two parallel metal surfaces, forming the plates of a capacitor - [b] may be positive or negative
Explanation. Standard molar enthalpy of formation of a compound from its elements can be +ve or –ve
For example. {tex}C+O_{2}[g] \rightarrow C O_{2}[g] ; \Delta_{r} H{/tex} = 393. 5 kJ mol-1
{tex}N_{2}[g]+\frac{1}{2} O_{2}[g] \rightarrow N_{2} O[g];{/tex} {tex}\Delta_{r} H{/tex} = +92 k J mol-1 - [d] calcium
Explanation. calcium - [c] -778 kJ
Explanation. Heat of reaction, {tex}\Delta_r{/tex} H = {tex}{\textstyle\sum_{}}\triangle_rH_{products}-{\textstyle\sum_{}}{\textstyle{\scriptstyle\triangle}_r}{\textstyle{\scriptstyle H}_{reactants}}{\textstyle\;}{\textstyle\;}{/tex}
{tex}\Rightarrow{/tex} {tex}\Delta_{r} H{/tex} = [ {tex}\Delta_{f} H{/tex} [N2O] + 3 {tex}\Delta_{f} H{/tex} [CO2]] – [ {tex}\Delta_{f} H{/tex} [N2O4] + 3 {tex}\Delta_{f} H{/tex} [CO]] {tex}\Rightarrow{/tex} {tex}\Delta_{r} H{/tex} = [81 + {3 {tex}\times{/tex} [-393]}] – 99. 7 + {3 {tex}\times{/tex} [-110]}] kJ
{tex}\Rightarrow{/tex} {tex}\Delta_{r} H{/tex} = -777. 7 kJ {tex}\approx{/tex} -778 kJ
To practice more questions & prepare well for exams, download myCBSEguide App. It provides complete study material for CBSE, NCERT, JEE [main], NEET-UG and NDA exams. Teachers can use Examin8 App to create similar papers with their own name and logo - [d] {tex}\lambda{/tex} = {tex}\frac{h}{m v}{/tex}
Explanation. Louis de-Broglie proposed that matter, like light , has a dual character. It exhibits wave as well as particle nature. The wavelength of the wave associated with a particle of mass m moving with velocity v is given by
{tex}\lambda{/tex} = {tex}\frac{h}{m v}{/tex} - [a] NH4NO3
Explanation. NH4+NO3–. In NH4+
N is -3 and
NO3– , N is +5 - [a] {tex}{[C{H_3}]_3}\mathop C\limits^ \oplus {/tex}
Explanation. {tex}{[C{H_3}]_3}\mathop C\limits^ \oplus {/tex} i. e. the tertiary carbocation is most stable. Alkyl groups directly attached to the positively charged carbon stabilise the carbocations due to inductive and hyperconjugation effects. - [b] alkaline KMnO4
Explanation. Baeyer’s reagent is a dilute alkaline KMnO4 solution. It is violet in colour when this solution reacts with the double bond the colour diaper and the whole solution become colourless - [b] Both AI2O3 and As2O3
Explanation. A12O3 and As2O3 are amphoteric in nature. Amphoteric oxides behave as acidic with bases and basic with acids - [a] Both Constant volume, qv or Constant pressure, qp
Explanation. In calorimetry, vessel called calorimeter is immersed in a known volume of a liquid. Measurements are made under two different conditions- At constant volume, qv
- At constant pressure, qp
- [b] Sodium acetate
Explanation. This is an example of Kolbe’s electrolysis method. The reaction is
{tex} { 2CH_3COONa + 2H_2O } \overset{_{electrolysis}}\longrightarrow{ CH_3. CH_3 + 2NaOH + H_2 + 2CO_2}{/tex}
The step-wise redox reactions occuring in the electrolytic cell are depicted as under
2H– {tex}\rightarrow{/tex} H2 - [d] A is false but R is true
Explanation. The resonance structure is hypothetical and individually does not represents any real molecules. According to the resonance theory, the actual structure of benzene cannot be adequately represented by any of these structures - [b] Both A and R are true but R is not the correct explanation of A
Explanation. Both A and R are true but R is not the correct explanation of A - [a] Both A and R are true and R is the correct explanation of A
Explanation. All isotopes have the same atomic number means the same number of electrons and they bear similar chemical properties - [a] Both A and R are true and R is the correct explanation of A
Explanation. 44g of CO2 = 1 mole {tex}\equiv{/tex} 1 g atom of C
16g CH4 = 1 mole {tex}\equiv{/tex} 1 g atom of C
1 g atom of C = 12 g C
12 g C contains 6. 023 {tex}\times{/tex} 1023 carbon atoms. Class 11 Chemistry Sample Paper Solution Section B
- According to the question, ionic product of Ni[OH]2 is 2. 0 × 10-15
Reaction
Ni[OH]2 {tex}\rightleftharpoons{/tex} Ni2+ + 2OH–
NaOH {tex}\rightarrow{/tex} Na+ + OH–
Here, [OH–]total = [2S + 0. 10]
So, Ksp = [Ni2+] [OH–]2
{tex}\Rightarrow{/tex} 2. 0 {tex}\times{/tex} 10-15 = [S] [0. 10 +2S]2
As Ksp is small, 2S