Sample QuestionsModel Paper 5 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Carbon-carbon double bond in alkenes consists of:
- A
one strong sigma $(\sigma)$ bond due to head-on overlapping of $sp ^3$ hybridised orbitals one weak pi $(\pi)$ bond.
- ✓
one strong sigma $(\sigma)$ bond due to head-on overlapping of $sp ^2$ hybridised orbitals one weak pi $(\pi)$ bond.
- C
one weak sigma $(\sigma)$ bond due to head-on overlapping of $sp ^2$ hybridised orbitals one weak pi $(\pi)$ bond.
- D
one weak sigma $(\sigma)$ bond due to head-on overlapping of $sp ^3$ hybridised orbitals one weak pi $(\pi)$ bond.
Answer: B.
View full solution →The collective study of separation, identification and quantitative determination of the composition of different substances is dealt under __________ chemistry.
Answer: A.
View full solution →The correct equation for the change in enthalpy is:
- ✓
$\Delta H =\Delta U + p \Delta V$
- B
$\Delta H =\Delta U + n \frac{p}{V}$
- C
$\Delta H =\Delta U +\frac{p}{V}$
- D
$\Delta H=\Delta U+T \Delta V$
Answer: A.
View full solution →How many metamers are possible for pentan-1-al?
Answer: D.
View full solution →The formula $E = h \nu$ is used to calculate
- A
- B
energy of the ejected electrons
- C
radiation emitted by a black body
- ✓
Answer: D.
View full solution →Which of the following are isoelectronic species i.e., those having the same number of electrons?
$
Na^{+}, K^{+}, Mg^{2+}, Ca^{2+}, S^{2-}, Ar
$
View full solution →Predict the major products of the following:
1. $CH _3- C \equiv C - Ph \xrightarrow[ H _2 O ]{ Hg ^{2+}, H ^{+}}$
2. $PhCH = CH 2 \xrightarrow{ HBr }$
View full solution →Write structural formulae of the following compounds.
1. 3, 4, 4, 5-tetramethylheptane
2. 2, 5-dimethylhexane
In three moles of ethane $\left( C _2 H _6\right)$, calculate the following:
1. Number of moles of carbon atoms.
2. Number of moles of hydrogen atoms.
3. Number of molecules of ethane.
View full solution →Would you expect the first ionization enthalpies of two isotopes of the same element to be the same or different?
Balance the following equation,
$
Fe+H_2 O \longrightarrow Fe_3 O_4+H_2
$
View full solution →Define electron gain enthalpy. What are its units?
In astronomical observations, signals observed from the distant starts are generally weak. If the photon detector receives a total of $=3.15 \times 10^{-18} J$ from the radiations of 600 nm . Calculate the number of photons received by the detector.
View full solution →Which method can be used to find out the strength of reductant/oxidant in a solution? Explain with an example.
Express the change in internal energy of a system when
1. No heat is absorbed by the system from the surroundings, but work (w) is done on the system. What type of wall does the system have?
2. No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. What type of wall does the system have?
3. w amount of work is done by the system and q amount of heat is supplied to the system. What type of system would it be?
Calculate the pH of a 0.10 M ammonia solution. Calculate the pH after 50.0 mL of this solution is treated with 25.0 mL of 0.10 M HCl . The dissociation constant of ammonia, $K _{ b }=1.77 \times 10^{-5}$
View full solution →Attempt any five of the following:
1. If $Qc < Kc$, when we continuously remove the product, what would be the direction of the reaction?
2. Explain the reason for the extraordinary stability of benzene in spite of the presence of three double bonds in it.
3. What effect does branching of an alkene chain has on its boiling point?
4. Write the IUPAC name:
5. How will you demonstrate that double bonds of benzene are somewhat different from that of olefines?
6. Why do alkynes not show geometrical isomerism?
7. Write an IUPAC name:
View full solution →1. Suggest a method to purify
i. a liquid which decomposes at its boiling point.
ii. kerosene oil containing water.
iii. camphor containing traces of common salt.
2. Giving justification, categorise the following molecules/ions as nucleophile or electrophile:
$
\begin{aligned}
& HS^{-}, BF_3, C_2 H_5 O^{-},\left(CH_3\right)_3 N:, \\
& C \stackrel{+}{l}, C H_3-\stackrel{+}{C}=O, H_2 N \stackrel{+}{:}, \stackrel{+}{N} O_2
\end{aligned}
$
View full solution →1. Write all structural isomers of molecular formula $C _3 H _6 O$
2. Write resonance structures of $CH _3 COO ^{-}$and show the movement of electrons by curved arrows.
View full solution →The value of $K _{ p }$ for the reaction,
$
CO_2(g)+C(s) \rightleftharpoons 2 CO(g)
$
is 3.0 at 1000 K . If initially, $P_{ CO _2}=0.48$ bar and $P _{ CO }=0$ bar and pure graphite is present, calculate the equilibrium partial pressures of CO and $CO _2$.
View full solution →Assertion (A): 232.508 can be written as $2.32508 \times 10^2$ in scientific notation.
Reason (R): While writing $2.32508 \times 10^2$, the decimal had to be moved to the left by two places and the same is the exponent (2) of 10 in the scientific notation.
- ✓
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
Answer: A.
View full solution →Assertion (A): In Sommerfeld's model, circular orbit is possible for the electron in K shell.
Reason (R): Electron present in $K$ shell corresponds to principal quantum number $n =1$.
- A
Both A and R are true and R is the correct explanation of A.
- ✓
Both A and R are true but R is not the correct explanation of A.
- C
A is true but R is false.
- D
Answer: B.
View full solution →Assertion (A): Sodium extract is made alkaline in the test of sulphur.
Reason (R): On reacting with $FeCl _3$, alkaline sodium extract, gives red colour.
- 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.
- ✓
Answer: D.
View full solution →Assertion (A): Overlapping in benzene is $sp ^2- sp ^2$ type.
Reason (R): C-C bond length in benzene is $1.3 \stackrel{\circ}{A}$.
- 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.
- ✓
A is true but R is false.
- D
Answer: C.
View full solution →The existing large number of organic compounds and their ever-increasing numbers has made it necessary to classify them on the basis of their structures. Organic compounds are broadly classified as open-chain compounds which are also called aliphatic compounds. Aliphatic compounds further classified as homocyclic and heterocyclic compounds. Aromatic compounds are special types of compounds. Alicyclic compounds, aromatic compounds may also have heteroatom in the ring. Such compounds are called heterocyclic aromatic compounds. Organic compounds can also be classified on the basis of functional groups, into families or homologous series. The members of a homologous series can be represented by general molecular formula and the successive members differ from each other in a molecular formula by a $- CH _2$ unit.
1. The successive members of a homologous series differ by which mass of amu? (1)
2. Does Pyridine, pyrrole, thiophene are all heteroaromatic compounds (1)
3. Difference between heterocyclic and homocyclic compound. (2)
OR
Is tetrahydrofuran is aromatic compounds? (2)
View full solution →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.
1. Out of $AlCl _3$ and $AlI _3$ which halides show maximum polarization? (1)
2. Out of $AlCl _3$ and $CaCl _2$ which one is more covalent in nature? (1)
3. The non-aqueous solvent like ether is added to the mixture of $LiCl , NaCl$ and KCl . Which will be extracted into the ether? (2)
OR
Out of $CaF _2$ and $CaI _2$ which one has a minimum melting point? (2)
View full solution →