The number of possible conformational isomers of ethane is ________.
- ✓infinite
- Bzero
- Cone
- Dtwo
Answer: A.
View full solution →Question types
Model Paper 1 question types
36 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.
36
Questions
6
Question groups
5
Question types
01
M.C.Q (1 Marks)
12 Q→02Assertion (A) & Reason (B) MCQ
4 Q→032 Marks Questions
6 Q→043 Marks Question
7 Q→05Case study (4 Marks)
2 Q→065 Marks Questions
5 Q→Sample Questions
Model Paper 1 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In a closed system, which of the following take place?
- AThe boundaries permit the flow of matter into it but not vice versa.
- BThe boundaries permit the flow of matter into or out of it.
- ✓The boundaries prevent the flow of matter into or out of it.
- DThe boundaries prevent the flow of matter out of it but not vice versa.
Answer: C.
View full solution →The ionic radii of $N ^{3-}, O ^{2-}$ and $F ^{-}$are respectively given by:
- A1.36, 1.71, 1.40
- B1.36, 1.40, 1.71
- ✓1.71, 1.40, 1.36
- D1.71, 1.36, 1.40
Answer: C.
View full solution →What product is obtained by heating ethylidene chloride with alcoholic KOH?
- ✓Ethyne
- BMethane
- CEthene
- DEthane
Answer: A.
View full solution →To which the terms stationary phase and mobile phase are associated?
- ✓Chromatography
- BSpectroscopy
- CDifferential Extraction
- DDistillation under reduced pressure
Answer: A.
View full solution →Assertion (A): Both 32 g of $SO _2$ and 8 g of $CH _4$ contain the same number of molecules.
Reason (R): Equal moles of two compounds contain the same number of molecules.
Reason (R): Equal moles of two compounds contain the same number of molecules.
- ✓Both A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true.
Answer: A.
View full solution →Assertion: A spectral line will be seen for a $2 p_x \rightarrow 2 p_y$ transition.
Reason: Energy is released in the form of waves of light when the electron drops from $2 p_{ v }$ to 2 p orbital.
Reason: Energy is released in the form of waves of light when the electron drops from $2 p_{ v }$ to 2 p orbital.
- AIf both Assertion & Reason are true and the reason is the correct explanation of the assertion.
- BIf both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
- CIf Assertion is true statement but Reason is false.
- ✓If both Assertion and Reason are false statements.
Answer: D.
View full solution →Assertion (A): $C _6 H _5 F$ gives large amount of nitration products than all the other halides
Reason (R): $F$ is most electronegative.
Reason (R): $F$ is most electronegative.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- ✓A is false but R is true.
Answer: D.
View full solution →Assertion (A): The term tautomerism was introduced by Maxwell in order to explain the chemical reactivity of a substance according to two possible structures.
Reason (R): Metamers can also be chain isomers or position isomers.
Reason (R): Metamers can also be chain isomers or position isomers.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- ✓A is true but R is false.
- DA is false but R is true.
Answer: C.
View full solution →Prove that the density of the nucleus is constant.
Write hydrocarbon radicals that can be formed as intermediates during monochlorination of 2-methylpropane. Which of them is more stable? Give reasons.
Write the structure and IUPAC names of different structural isomers of alkenes corresponding to $C _5 H _{10}$.
View full solution →The element H and O combine separately with the third element S to form $H _2 S$ and $SO _2$ respectively, then show that they combine directly with each other to from $H _2 O$.
View full solution →The electron gain enthalpy of bromine is 3.36 eV . How much energy in kcal is released when 8 g of bromine is completely converted to $Br ^{-}$ions in the gaseous state?
$
\left(1 eV=23.06 kcal mol^{-1}\right)
$
View full solution →$
\left(1 eV=23.06 kcal mol^{-1}\right)
$
A sugar syrup of weight 214.2 g contains 34.2 g of sugar $\left( C _{12} H _{22} O _{11}\right)$. Calculate
i. molal concentration, and
ii. mole fraction of sugar in the syrup
View full solution →i. molal concentration, and
ii. mole fraction of sugar in the syrup
How do atomic radius vary in a period and in a group? How do you explain the variation?
Similar to electron diffraction, neutron diffraction microscope is also used for the determination of the structure of molecules. If the wavelength used here is 800 pm . Calculate the characteristic velocity associated with the neutron.
PbO and $PbO _2$ react with HCl according to the following chemical equations:
$
\begin{aligned}
& 2 PbO+4 HCl \rightarrow 2 PbCl_2+2 H_2 O \\
& PbO_2+4 HCl \rightarrow PbCl_2+Cl_2+2 H_2 O
\end{aligned}
$
Why do these compounds differ in their reactivity?
View full solution →$
\begin{aligned}
& 2 PbO+4 HCl \rightarrow 2 PbCl_2+2 H_2 O \\
& PbO_2+4 HCl \rightarrow PbCl_2+Cl_2+2 H_2 O
\end{aligned}
$
Why do these compounds differ in their reactivity?
Assuming the water vapor to be a perfect gas, calculate the internal energy change when 1 mol of water at $100^{\circ} C$ and 1 bar pressure is converted to the ice at $0^{\circ} C$. Given the enthalpy of fusion of ice is 6.00 kJ mol 1 heat capacity of water is $4.2 J / g ^{\circ} C$.
View full solution →In order to explain the characteristic geometrical shapes of polyatomic molecules, Pauling introduced the concept of hybridisation. The orbitals undergoing hybridisation should have nearly the same energy. There are various type of hybridisations involving s, p and d-type of orbitals. The type of hybridisation gives the characteristic shape of the molecule or ion.
1. Why all the orbitals in a set of hybridised orbitals have the same shape and energy?
2. Out of $XeF _2$ and $SF _2$ which molecule has the same shape as $NO _2^{+}$ion?
3. Out of $XeF _4$ and $XeF _2$ which molecule doesn't have the same type of hybridisation as P (Phosphorus) has in $PF _5$ ?
OR
Unsaturated compounds undergo additional reactions. Why?
View full solution →1. Why all the orbitals in a set of hybridised orbitals have the same shape and energy?
2. Out of $XeF _2$ and $SF _2$ which molecule has the same shape as $NO _2^{+}$ion?
3. Out of $XeF _4$ and $XeF _2$ which molecule doesn't have the same type of hybridisation as P (Phosphorus) has in $PF _5$ ?
OR
Unsaturated compounds undergo additional reactions. Why?
Chromatography is an important technique extensively used to separate mixtures into their components, purify compounds and also test the purity of compounds. Based on the principle involved, chromatography is classified into different categories. Two of these are Adsorption chromatography and Partition chromatography. Two main types of chromatographic techniques are based on the principle of differential adsorption column chromatography, and thin-layer chromatography. Adsorption chromatography is based on the fact that different compounds are adsorbed on an adsorbent to different degrees. Column chromatography involves the separation of a mixture over a column of adsorbent (stationary phase) packed in a glass tube. Thin-layer chromatography (TLC) is another type of adsorption chromatography, which involves the separation of substances of a mixture over a thin layer of an adsorbent coated on a glass plate. Partition chromatography is based on the continuous differential partitioning of components of a mixture between stationary and mobile phases.
1. Which adsorbent is used in adsorption chromatography?
2. How do you visualize colourless compounds after separation in Paper Chromatography?
3. Why paper chromatography is a type of partition chromatography?
OR
Which chromatography is shown in following image?
1. Which adsorbent is used in adsorption chromatography?
2. How do you visualize colourless compounds after separation in Paper Chromatography?
3. Why paper chromatography is a type of partition chromatography?
OR
Which chromatography is shown in following image?
1. Explain hyperconjugation effect. How does hyperconjugation effect explain the stability of alkenes?
2. Draw the resonance structures of the following compounds:
2. Draw the resonance structures of the following compounds:
1. What is the general molecular formula of saturated monohydric alcohols?
2. Write structural formulae for compounds named as-
a. 1-Bromoheptane
b. 5-Bromoheptanoic acid
2. Write structural formulae for compounds named as-
a. 1-Bromoheptane
b. 5-Bromoheptanoic acid
A sample of pure $PCl _5$ was introduced into an evacuated vessel at 473 K . After equilibrium was attained, concentration of $PCl _5$ was found to be $0.5 \times 10^{-1} mol L ^{-1}$. If value of $K _{ C }$ is $8.3 \times 10^{-3}$, what are the concentrations of $PCl _3$ and $Cl _2$ at equilibrium?
$
PCl_5(g) \rightleftharpoons PCl_3(g)+Cl_2(g)
$
View full solution →$
PCl_5(g) \rightleftharpoons PCl_3(g)+Cl_2(g)
$
The pH of milk, black coffee, tomato juice, lemon juice, and egg white are $6.8,5.0,4.2,2.2$ and 7.8 respectively. Calculate corresponding hydrogen ion concentration in each.
View full solution →Attempt any five of the following:
1. Convert methane into ethane.
2. Write IUPAC name of the following: $CH _3\left( CH _2\right)_4 CH \left( CH _2\right)_3 CH _3 CH _2- CH \left( CH _3\right)_2$
3. To which category of compounds does cyclohexane belong?
4. Name the type of hybridization in C (2) and C (3) in the following molecule
5. What are Arenes?
6. n-propylmagnesium bromide on hydrolysis gives propane. Is there any other Grignard reagent which also gives propane? If so, give its name, structure and equation for the reaction.
7. How will you distinguish between acetylene and ethylene?
View full solution →1. Convert methane into ethane.
2. Write IUPAC name of the following: $CH _3\left( CH _2\right)_4 CH \left( CH _2\right)_3 CH _3 CH _2- CH \left( CH _3\right)_2$
3. To which category of compounds does cyclohexane belong?
4. Name the type of hybridization in C (2) and C (3) in the following molecule
5. What are Arenes?
6. n-propylmagnesium bromide on hydrolysis gives propane. Is there any other Grignard reagent which also gives propane? If so, give its name, structure and equation for the reaction.
7. How will you distinguish between acetylene and ethylene?
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