Sample QuestionsModel Paper 3 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In Ostwald's process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can be obtained starting only with 10.00 g of ammonia and 20.00 g of oxygen?
Answer: A.
View full solution →Enthalpies of formation of $CO ( g ), CO _2(g), N _2 O ( g )$, and $N _2 O _4(g)$ are $-110,-393,81$, and $9.7 kJ mol ^{-1}$ respectively. Find the value of $\Delta_{ r } H$ for the reaction: $N _2 O _4(g)+3 CO ( g ) \rightarrow N _2 O ( g )+3 CO _2(g)$
- A
$-850 kJ$
- B
$-600 kJ$
- ✓
$-778 Kj$
- D
$-802 kJ$
Answer: C.
View full solution →Which of these is not a characteristic of Aromatic Hydrocarbons?
- A
Carbon atoms form a closed chain or ring.
- ✓
Carbon atoms form a an open chain.
- C
They may contain double bonds.
- D
They are special type of cyclic compounds.
Answer: B.
View full solution →Which of the following always has a negative value?
Answer: D.
View full solution →The effective distance between the centre of the nucleus of an ion and the point up to which the nucleus has an influence on its electron cloud is called _____________.
Answer: A.
View full solution →Wavelengths of different radiations are given below:
$
\lambda=(A) 300 nm
$
$\lambda(B)=300 \mu m$
$\lambda( C )=3 nm$
$\lambda$ (D) $=30 \stackrel{\circ}{A}$
Arrange these radiations in the increasing order of their energies.
View full solution →Suggest a route to prepare ethyl hydrogensulphate $\left( CH _3- H _2- OSO _2- OH \right)$ starting from ethanol $\left( C _2 H _5 OH \right)$.
View full solution →Explain why the system are not aromatic.
What would be IUPAC names and symbols for elements with atomic numbers 122, 127, 135, 149 and 150?
Mention the general characteristics of equilibria involving physical processes.
Calculate the amount of $KCIO _3$ needed to supply sufficient oxygen for burning 112 L of CO gas at NTP.
View full solution →Write characteristics of all seven periods of the periodic table.
The Balmer series in the hydrogen spectrum corresponds to the transition from $n_1=2$ to $n_2=3,4$, .... This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to $n =4$ orbit. $\left( R _{ H }=109677 cm^{-1}\right)$
View full solution →Depict the galvanic cell in which the reaction $Zn ( s )+2 Ag ^{+}( aq ) \longrightarrow Zn ^{2+}( aq )+2 Ag ( s )$ takes place, Further show:
i. which of the electrode is negatively charged,
ii. the carriers of the current in the cell, and
iii. individual reaction at each electrode.
View full solution →221.4J is needed to heat 30 g of ethanol from $15^{\circ} C$ to $18^{\circ} C$. Calculate (a) specific heat capacity, and (b) molar heat capacity of ethanol.
View full solution →Calculate the degree of ionization of 0.05 M acetic acid if its $pK _{ a }$ value is 4.74 . How is the degree of dissociation affected when its solution also contains
a. 0.01 M
b. $0.1 M HCl ?$
View full solution →Attempt any five of the following:
(a) What happens when benzene is treated with acetyl chloride in presence of $AlCl _3$ ?
(c) Classify the hydrocarbons according to the carbon-carbon bond.
(d) Arrange the following: $HCl , HBr , Hl , HF$ in order of decreasing reactivity towards alkenes.
(e) Why is $CH _2= CH - CH _2- Cl$ more easily hydrolysed than $CH _3- CH _2- CH _2- Cl$ ?
(f) Which of the two trans-but-2-ene or trans-pent-2-ene is non-polar?
(g) What are benzenoids? View full solution →View full solution →i. Which bond is more polar in the following pairs of molecules:
a. $H _3 C - H , H _3 C - Br$
b. $H _3 C - NH _2, H _3 C - OH$
c. $H _3 C - OH , H _3 C - SH$
ii. Explain the principle of paper chromatography.
View full solution →$K _1$ and $K _2$ for dissociation of $H _2 S$ are $4 \times 10^{-3}$ and $1 \times 10^{-5}$. Calculate sulphide ion concentration in $0.1 M H _2 S$ solution.
View full solution →Assertion (A): The standard unit for expressing the mass of atoms is a.m.u.
Reason (R): a.m.u. stands for mass of 1 atom of carbon.
- 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
A is false but R is true.
Answer: C.
View full solution →Assertion (A): In case of isoelectronic ions the ionic size increases with the increase in atomic number.
Reason (R): The greater the attraction of nucleus, greater is the ionic radius.
- 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.
- ✓
A is false but R is true.
Answer: D.
View full solution →Assertion (A): Moving phase is liquid and stationary phase is solid in paper chromatography.
Reason (R): Paper chromatography is used for analysis of polar organic compounds.
- 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.
- ✓
A is false but R is true.
Answer: D.
View full solution →Assertion (A): Fluoride has the lowest and iodide has the highest boiling point.
Reason (R): Boiling points of haloalkanes increases with increasing atomic mass.
- ✓
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.
Answer: A.
View full solution →The ionic character of metallic halides tends toward covalent nature as per Fajan's rule. Such covalent halides behave as non-metal in their higher oxidation states. The property to hydrolyse to give oxy-acids of the element and corresponding hydro halogen acid for most non-metallic elements proceeds exceptionally in the way, keeping oxidation number of element and halide sam in oxo-acids.
Non-polar halides are immiscible in water, as they do not show hydrolysis, but halides of some elements with empty d-orbital undergo hydrolysis. Stability of halides of the higher state is governed by the inert-pair effect.
1. How does halide undergo hydrolysis to give oxy-acids of underlined element $PCl _3$ ? (1)
2. Out of $NCl _3$ and $BCl _3$ undergoes hydrolysis to form oxy-acids? Write the chemical reaction for the correct answer. (1)
3. Out of $PbCl _4, PbF _4, PbI _4$ and $PbBr _4$ which one doesn't exist? (2)
OR
Non-Polar halides are immiscible in water. Why? (2)
View full solution →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.
1. Draw the structure of 3-Ethyl-4,4-dimethylheptane. (1)
2. How is the numbering in branched chain hydrocarbon done? (1)
3. Derive the structure of 2-Chlorohexane. (2)
OR
Why $CH _4$ after becoming- $CH _3$ called a methyl group? (2)
View full solution →