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Year: 2022
Topic: Some Basic Concepts of Chemistry
1.
Which one is not correct mathematical equationfor Dalton's Law of partial pressure?
Here p = total pressure of gaseous mixture
(1).
\(p\,=\,p_1\,+\,p_2\,+\,p_3\)
(2).
\(p\,=\,n_1 \frac{RT}{V}\,+\,n_2 \frac{RT}{V}\,+\,n_3 \frac{RT}{V}\)
(3).
\(p_i\,=\, x_ip_i\) where \(p_i\) = partial pressure of \(i^{th}\) gas and \(x_i\) = mole fraction of \(i^th\) gas in gaseous mixture
(4).
\(p_i\,=\, x_ip_i^\circ\) where \(p_i^\circ\) = partial pressure of \(i^{th}\) gas and \(x_i\) = mole fraction of \(i^th\) gas in gaseous mixture

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Year: 2022
Topic: Some Basic Concepts of Chemistry
2.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In a particular point defect, anionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason (R) : In an ionic solid, Frenkel defectarises due to dislocation of cation from its latticesite to interstitial site, maintaining overall electrical neutrality.
In the light of the above statements, choose the most appropriate answer from the options given below:
(1).
Both (A) and (R) are correct and (R) is the correct explanation of (A)
(2).
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
(3).
(A) is correct but (R) is not correct
(4).
(A) is not correct but (R) is correct

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Year: 2025
Topic: Some Basic Concepts of Chemistry
3.
Among the following, choose the ones with equal number of atoms.
A. 212 g of \(Na_2 CO_3 \left(s\right)\) [molar mass = 106 g]
B. 248 g of\( Na_2 O \left(s\right)\) [molar mass = 62 g]
C. 240 g of \(NaOH \left(s\right)\) [molar mass = 40 g]
D. 12 g of \(H_2 \left(g\right)\) [molar mass = 2 g]
E. 220 g of \(CO_2 \left(g \right)\) [molar mass = 44 g]
Choose the correct answer from the options given below :
(1).
B, D, and E only
(2).
A, B, and C only
(3).
A, B, and D only
(4).
B, C, and D only

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Year: 2024
Topic: Some Basic Concepts of Chemistry
4.
A compound X contains 32 % of A, 20 % of B2 and remaining percentage of C. Then, the empirical formula of X is:
(1).
\(\text{AB}_2\text{C}_2\)
(2).
\(\text{ABC}_4\)
(3).
\(\text{A}_2\text{BC}_2\)
(4).
\(\text{ABC}_3\)

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Year: 2024
Topic: Some Basic Concepts of Chemistry
5.
The highest number of helium atoms is in
(1).
4 g of helium
(2).
2.271098 L of helium at STP
(3).
4 mol of helium
(4).
4 u of helium

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Year: 2024
Topic: Some Basic Concepts of Chemistry
6.
1 gram of sodium hydroxide was treated with 25mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to
(1).
Zero mg
(2).
200 mg
(3).
750 mg
(4).
250 mg

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Year: 2023
Topic: Some Basic Concepts of Chemistry
7.
Intermolecular forces are forces of attraction andrepulsion between interacting particles that willinclude:
A. dipole - dipole forces.
B. dipole - induced dipole forces
C. hydrogen bonding
D. covalent bonding
E. dispersion forces
Choose the most appropriate answer from theoptions given below:
(1).
A, B, C, D are correct
(2).
A, B, C, E are correct
(3).
A, C, D, E are correct
(4).
B, C, D, E are correct

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Year: 2023
Topic: Some Basic Concepts of Chemistry
8.
The right option for the mass of CO2 produced by heating 20g of 20% pure limestone is (Atomic mass of Ca = 40)
(1).
1.76 g
(2).
2.64 g
(3).
1.32 g
(4).
1.12 g

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Year: 2022
Topic: Some Basic Concepts of Chemistry
9.
Choose the correct statement:
(1).
Diamond and graphite have two dimensional network.
(2).
Diamond is covalent and graphite is ionic.
(3).
Diamond is sp3 hybridized and graphite is sp2 hybridized.
(4).
Both diamond and graphite are used as dry lubricants.

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Year: 2022
Topic: Some Basic Concepts of Chemistry
10.
In one molal solution that contains 0.5 mole of asolute, there is
(1).
500 mL of solvent
(2).
500 g of solvent
(3).
100 mL of solvent
(4).
1000 g of solvent

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Year: 2022
Topic: Some Basic Concepts of Chemistry
11.
A 10.0 L flask contains 64g ofoxygen at \(\text{27}^\circ C\). (Assume O2 gas is behaving ideally). The pressure inside theflask in bar is (Given R = 0.0831 L bar K-1 mol-1)
(1).
2.5
(2).
498.6
(3).
49.8
(4).
4.9

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Year: 2022
Topic: Some Basic Concepts of Chemistry
12.
Copper crystallises in fcc unit cell with cell edgelength of \(3.608 \times 10^8\) cm. The density of copper is 8.92 g cm-3. Calculate the atomic mass of copper.
(1).
63.1u
(2).
31.55 u
(3).
60 u
(4).
65 u

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Year: 2020
Topic: Some Basic Concepts of Chemistry
13.
Which one of the followings has maximum number of atoms ?
(1).
1g of Mg(s) [Atomic mass of Mg = 24]
(2).
1g of O2 (g) [Atomic mass of O = 16]
(3).
1g of Li(s) [Atomic mass of Li = 7]
(4).
1g of Ag(s) [Atomic mass of Ag = 108]

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Year: 2019
Topic: Some Basic Concepts of Chemistry
14.
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is
(1).
20
(2).
30
(3).
40
(4).
10

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Year: 2018
Topic: Some Basic Concepts of Chemistry
15.
In which case is number of molecules of water maximum ?
(1).
10–3 mol of water
(2).
0.00224 L of water vapours at 1 atm and 273 K r
(3).
0.18 g of water
(4).
18 mL of wate

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