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Published on: 19/06/2019
Atoms and Molecules
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Isotopes have
Same physical properties and different chemical properties
Same chemical properties and different physical properties
Same physical and chemical properties
Different physical and chemical properties
2.
Which of the following is a diatomic molecule?
CO
CO2
SO3
PO4
3.
4.
Adding electrons to an atom will result in a (an):
Molecule
Anion
Cation
Salt
5.
A group of atoms chemically bonded together is a (an):
Molecule
Atom
Salt
Element
6.
One mole of a gas occupies a volume of 22.4 l. This is derived from:
Berzelius's hypothesis
Gay-Lussac's law
Avogadro's law
Dalton's law
7.
Which of the contains maximum number of molecules
1 g of CO2
1g of N2
1 g of H2
1 g of CH4
8.
Isotones have equal number of
Proton
Electron
Neutron
Atom
9.
17Cl35, 17Cl37 form the pair of
Isotope
Isonar
Isotone
Isomer
10.
The smallest particle of an element which involve in a chemical reaction is
Atom
Molecule
Mole
Avogadro's molecule
11.
12.
The atomic number of an element is 12 and its mass number is 24. The number of electrons, protons and neutrons respectively will be
12, 12, 24
24,12,12
12,12,12
12, 24,12
13.
Which of the following pairs are isotopes?
Oxygen and ozone
Ice and water
NO and NO2
Hydrogen and deuterium
14.
Mass of an electron is
9.1083 x 10-31kg
9.1083 x 10-24kg
1.67262 x 10-27kg
1.67 x 10-24gm
15.
Which of the following statement regarding an atom is always correct?
An atom has equal number of electrons and protons
An atom has equal number of electrons and neutrons
An atom has equal number of electrons, protons and neutrons
An atom has equal number of protons and neutrons
16.
Mass number is the
Number of protons
Sum of protons and electrons
Number of neutrons
Sum of protons and neutrons
17.
Which among the following is a homo atomic molecule?
N2
NH3
HCl
N2O
18.
Pick out the isotopes among the following pairs
6C13, 7N14
18Ar4, 20Ca4
6C12, C614
5B12, 6C13
19.
Atoms of different elements with different atomic numbers, but same mass number are known as _________
isobars
isotopes
isotones
isomers
20.
The mass of an atom is measured in ____________
kg
amu
g
Pm
21.
1 mole of any substance contains __________ molecules
6.023 × 1023
6.023 × 10-23
3.0115 × 1023
12.046 × 1023
22.
The gram molecular mass of oxygen molecule is
16 g
18 g
32 g
17 g
23.
In the nucleus of 20Ca40, there are
20 protons and 40 neutrons
20 protons and 20 neutrons
20 protons and 40 electrons
40 protons and 20 electrons
24.
The volume occupied by 1 mole of a diatomic gas at S.T.P is
11.2 liters
5.6 liters
22.4 liters
44.8 liters
25.
Which of the following statement is incorrect?
12 gram of C – 12 contains Avogadro’s number of atoms.
One mole of oxygen gas contains Avogadro’s number of molecules
One mole of hydrogen gas contains Avogadro’s number of atoms
One mole of electrons stands for 6.023 × 1023 electrons.
26.
Which of the following represents 1 amu?
Mass of a C – 12 atom
Mass of a hydrogen atom
1/12th of the mass of a C – 12 atom
Mass of O – 16 atom
27.
Mass of 1 mole of Nitrogen atom is
28 amu
14 amu
28 g
14 g
28.
The volume occupied by 4.4 g of CO2 at S.T.P
22.4 liter
2.24 liter
0.24 liter
0.1 liter
29.
Which of the following is a triatomic molecule?
Glucose
Helium
Carbon dioxide
Hydrogen
30.
Which of the following has the smallest mass?
6.023 × 1023 atoms of He
1 atom of He
2 g of He
1 mole atoms of He
1.
(b)
Same chemical properties and different physical properties
2.
(a)
CO
3.
(a)
4.
(b)
Anion
5.
(a)
Molecule
6.
(c)
Avogadro's law
7.
(c)
1 g of H2
8.
(c)
Neutron
9.
(a)
Isotope
10.
(a)
Atom
11.
(b)
12.
(c)
12,12,12
13.
(d)
Hydrogen and deuterium
14.
(a)
9.1083 x 10-31kg
15.
(a)
An atom has equal number of electrons and protons
16.
(d)
Sum of protons and neutrons
17.
(a)
N2
18.
(c)
6C12, C614
19.
(a)
isobars
20.
(b)
amu
21.
(a)
6.023 × 1023
22.
(c)
32 g
23.
(b)
20 protons and 20 neutrons
24.
(c)
22.4 liters
25.
(c)
One mole of hydrogen gas contains Avogadro’s number of atoms
26.
(c)
1/12th of the mass of a C – 12 atom
27.
(d)
14 g
28.
(b)
2.24 liter
29.
(c)
Carbon dioxide
30.
(b)
1 atom of He
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
