Atoms and Molecules - Tamil Nadu Board STD 10 Science Questions

Q 1Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.1 Mark

Which of the following pair is an example of isotopes?

A
$21 \mathrm{Sc}^{45}$ and ${ }_{23} \mathrm{~V}^{50}$
✓
${ }_{22} \mathrm{Ti}^{48}$ and ${ }_{22} \mathrm{Ti}^{50}$
C
${ }_{22} \mathrm{Ti}^{50}$ and ${ }_{23} \mathrm{~V}^{50}$
D
${ }_{21} \mathrm{Sc}^{45}$ and ${ }_{22} \mathrm{Ti}^{50}$

Answer: B.

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Q 2Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.1 Mark

Which of the following contains maximum number of molecules?

A
$1 \mathrm{~g}$ of $\mathrm{CO}_2$
✓
$1 \mathrm{~g}$ of $\mathrm{N}_2$
C
$1 \mathrm{~g}$ of $\mathrm{H}_2$
D
$1 \mathrm{~g}$ of $\mathrm{CH}_4$

Answer: B.

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Q 3Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.1 Mark

Which of the following correctly represents 360 g of water?
(i) 2 moles of water
(ii) 20 moles of water
(iii)$ 6.023 × 10^{23}$ molecules of water
(iv)$ 1.2044 × 10^{25}$ molecules of water

A
(i) only
B
(i) and (iv)
C
(ii) and (iii)
✓
(ii) and (iv).

Answer: D.

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Q 4Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.1 Mark

Which of the following will have maximum mass?

✓
0.1 mole of $\mathrm{NH}_3$
B
1022 atoms of carbon
C
1022 molecules of CO2
D
1 g of Fe

Answer: A.

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Q 5Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer.1 Mark

If the atomic mass of sodium is $23 \mathrm{amu}$, then the mass of $3.011 \times 10^{23}$ sodium atoms is

A
11.5 kg
B
23 g
C
0.5 mole
✓
11.5 g.

Answer: D.

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Q 6Fill in the blank1 Mark

Atomicity of an element is equal to _____.

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Q 7Fill in the blank1 Mark

The atomicity of H2SO4 is ______.

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Q 8Fill in the blank1 Mark

The metals Cu, Ag, Au are _____ elements.

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Q 9Fill in the blank1 Mark

Atomicity of sulphur is _____.

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Q 10Fill in the blank1 Mark

Relative molecular mass is equal to _____.

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Q 11True-False1 Mark

Avogadro’s law determines the relation between molecular mass and absolute density.

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Q 12True-False1 Mark

The volume occupied by 14 g of Nitrogen gas is 22.4 litres.

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Q 13True-False1 Mark

The number of moles of a sample that contains 12.046 x 1023 atoms of iron is 2.

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Q 14True-False1 Mark

The molecular formula of gases can be derived using Avogadro’s law.

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Q 15True-False1 Mark

The mathematical representation of Avogadro’slawisV/n=Constant(or)Vccn(or) V = Constant × n.

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Q 16Assertion & Reason1 Mark

Assertion (A): ${ }_6 C ^{13}$ and ${ }_7 N ^{14}$ are called isotones.
Reason (R): Atoms of different elements having the same number of neutrons, but a different atomic number and different mass number are called isotones.

✓
Both (A) and (R) are correct
B
Both (A) and (R) are wrong
C
(A) is correct but (R) is wrong
D
(A) is wrong but (R) is correct.

Answer: A.

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Q 17Assertion & Reason1 Mark

Assertion (A): $NH _3, H _2 O , HCl$ are heteroatomic molecules.
Reason $( R )$ : The molecule that consists of atoms of different elements is called heteroatomic molecules.

✓
Both (A) and (R) are correct
B
Both (A) and (R) are wrong
C
(A) is correct but (R) is wrong
D
(A) is wrong but (R) is correct.

Answer: A.

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Q 18Assertion & Reason1 Mark

\Assertion (A): ${ }_{17} Cl ^{35}$ and ${ }_{17} Cl ^{37}$ are isotones.
Reason (R): Atoms of the same element have the same atomic number but a different mass number.

A
Both (A) and (R) are correct
B
Both (A) and (R) are wrong
C
(A) is correct but (R) is wrong
✓
(A) is wrong but (R) is correct.

Answer: D.

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Q 19Assertion & Reason1 Mark

Assertion $( A ):{ }_{18} Ar ^{40}$ and ${ }_{20} Ca ^{40}$ are isobars.
Reason (R): They have the same atomic mass but a different atomic number.

✓
Both (A) and (R) are correct
B
Both (A) and (R) are wrong
C
(A) is correct but (R) is wrong
D
(A) is wrong but (R) is correct.

Answer: A.

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Q 20Assertion & Reason1 Mark

Assertion (A): An atom is no longer indivisible.
Reason (R): The subatomic particles protons, electrons and neutrons were discovered.

✓
Both (A) and (R) are correct
B
Both (A) and (R) are wrong
C
(A) is correct but (R) is wrong
D
(A) is wrong but (R) is correct.

Answer: A.

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Q 21[1 Mark Questions]1 Mark

What are the types of molecules? Give an example for each type?

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Q 22[1 Mark Questions]1 Mark

Distinguish between isotopes and isobars.

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Q 23[1 Mark Questions]1 Mark

Write the relationship between

Atomicity and Molecular mass
Molecular mass and Vapour density.

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Q 24[1 Mark Questions]1 Mark

Define Vapour density.

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Q 25[1 Mark Questions]1 Mark

How is Average atomic mass calculated?

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Q 26[2 Mark Questions]2 Marks

If ten volumes of dihydrogen gas react with five volumes of dioxygen gas, how many volumes of water vapour could be produced?

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Q 27[2 Mark Questions]2 Marks

In three moles of ethane $\left( C _2 H _6\right)$, calculate the following:

Number of moles of carbon atoms
Number of moles of hydrogen atoms
Number of molecules of ethane

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Q 28[2 Mark Questions]2 Marks

Chlorophyll, the green pigment of plants responsible for photosynthesis contain $2.68\%$ of Mg by weight. Calculate the number of magnesium atoms in $20$ g of chlorophyll.

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Q 29[2 Mark Questions]2 Marks

A flask P contains 0.5 moles of oxygen gas. Another flask Q contains 0.4 moles of ozone gas. Which of the two flasks contains greater number of oxygen atoms?

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Q 30[2 Mark Questions]2 Marks

Calculate the mass of $CO _2$ which contains the same number of molecules as are contained in $40 g$ of $SO _2$.

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Q 31[4 Mark Questions]4 Marks

A compound made up of two elements A and B has A = 70%, B = 30%. Their relative number of moles in the compound are 1.25 and 1.88. Calculate.
(a) Atomic masses of the elements A and B.
(b) The molecular formula of the compound, if its molecular mass is found to be 160.

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Q 32[4 Mark Questions]4 Marks

Explain the classification of molecules based on atomicity.

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Q 33[4 Mark Questions]4 Marks

State and explain the applications of Avogadro’s law.
(OR)
Give any two applications of Avogadro’s law.
(OR)
Write any three applications of Avogadro’s law.

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Q 34[4 Mark Questions]4 Marks

Write the applications of Avogadro’s Law.

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Q 35[4 Mark Questions]4 Marks

What are the differences between atoms and molecules?

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Q 36Match The Following.4 Marks

i. 22 g of $CO _2$	(a) 2 moles
ii. 18 g of $H _2 O$	(b) 4 moles
iii. 360 g of Glucose	(c) 0.5 mole
iv. 64 g of $CH _4$	(d) 1 mole

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Q 37Match The Following.4 Marks

i. $H _2 O$	(a) 16
ii. $CO _2$	(b) 18
iii. $C _6 H _{12} O _6$	(c) 44
iv. $CH _4$	(d) 180

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Q 38Match The Following.4 Marks

i. Isotopes	(a) $S _8, P _4$
ii. Isobars	(b) ${ }_6 C ^{13}{ }_7 N ^{14}$
iii. Isotones	(c) ${ }_1 H ^1,{ }_1 H ^2,{ }_1 H ^3$
iv. Polyatomic molecule	(d) ${ }_{18} Ar ^{40}{ }_{20} Ca ^{40}$

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Q 39Match The Following.4 Marks

i. $H_2$	(a) Hetero diatomic molecule
ii. HCl	(b) Monoatomic molecule
iii. $H_2O$	(c) Homo diatomic molecule
iv. Ne	(d) Hetero triatomic molecule

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Q 40Match The Following.4 Marks

i. $F_2$	(a) Polyatomic molecule
ii. $O _3$	(b) Monoatomic molecule
iii. $P_4$	(c) Diatomic molecule
iv. $He$	(d) Triatomic molecule

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Q 41[7 marks Questions]7 Marks

The Vapour Density of a gaseous element is 5 times that of oxygen under similar conditions. If the molecule is triatomic, what will be its atomic mass?

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Q 42[7 marks Questions]7 Marks

Calculate the total number of electrons present in 1.6 g of methane.

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Q 43[7 marks Questions]7 Marks

The density of water at room temperature is 1.0 g/mL. How many molecules are there in a drop of water if its volume is 0.05 mL?

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Q 44[7 marks Questions]7 Marks

Calculate the number of moles in each of the following.
(i) 392 g of sulphuric acid
(ii) 44.8 litres of sulphur dioxide at N.T.P.
(iii) 6.022 × 1022 molecules of oxygen
(iv) 8 g of calcium

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Q 45[7 marks Questions]7 Marks

Calculate the number of atoms in each of the following: (i) 52 moles of He (ii) 52 u of He (iii) 52 g of He

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Atoms and Molecules Science - Atoms and Molecules

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