

SAT Chemistry - Atoms and Molecules
Exam Duration: 45 Mins Total Questions : 30
The number hydrogen atoms in 2 g of hydrogen is
- (a)
2 x 6.022 x 1023
- (b)
6.022 x 1023
- (c)
2
- (d)
1
What is the mass of 2 moles of HCI?
- (a)
36.5 g
- (b)
73 g
- (c)
3.65 g
- (d)
7.3 g
A solution is prepared by adding 109 of a substance to 40 g of water. The mass percent of the solute is
- (a)
25%
- (b)
10%
- (c)
20%
- (d)
40%
How many molecules are there in 0.1 moles of CO2?
- (a)
6.022 x 1023
- (b)
6.022 x 1022
- (c)
6.022 X 1021
- (d)
6.022 X 1024
The volume of 3.2 g oxygen gas at STP is
- (a)
22.7 L
- (b)
2.27 L
- (c)
227 L
- (d)
0.227 L
The symbols for ferric ion and ammonium ion are respectively
- (a)
Fe2+, NH3
- (b)
Fe2+, NH4+
- (c)
Fe3+, NH4+
- (d)
Fe3+, NH2-
Latin name of potassium is
- (a)
Plumbum
- (b)
Stannum
- (c)
Natrium
- (d)
Kalium
In which of the following pairs the magnitude positive charge of the cation is equal to the negative charge of the anion
- (a)
Cupric ion and hydroxide ion
- (b)
Ferrous ion and hydroxide ion
- (c)
Cuprous ion and chloride ion
- (d)
Ferrous ion and chloride ion
Which of the following is a trivalent ion?
- (a)
Sulphide
- (b)
Carbide
- (c)
Oxide
- (d)
Nitride
Molecular mass of nitrogen molecule is equal to the molecular mass of
- (a)
NO
- (b)
O2
- (c)
CO
- (d)
None of these
The number of atoms per molecule is maximum in
- (a)
Chlorine
- (b)
Ozone
- (c)
Argon
- (d)
Hydrogen
The value of Avogadro number is
- (a)
6.022 X 1020
- (b)
6.022 X .1023
- (c)
6.022 X 1022
- (d)
6.022 X 1021
Almost the entire mass of an atom is concentrated in the ____________
- (a)
proton
- (b)
electrons
- (c)
nucleus
- (d)
neutrons
An atom has a mass number of 23 and atomic number 11. The number of protons are ____________
- (a)
11
- (b)
12
- (c)
23
- (d)
24
The proton is heavier than an electron by ____________
- (a)
1850 times
- (b)
1840 times
- (c)
1000 times
- (d)
100 times
Carbon-12 atom has ______________
- (a)
6 electrons, 6 protons, 6 neutrons
- (b)
6 electrons, 12 protons, 6 neutrons
- (c)
12 electrons, 6 protons, 6 neutrons
- (d)
18 electrons, 6 protons and 6 neutron
In Rutherford's alpha-scattering experiment, a foil of element that was used _______
- (a)
gold
- (b)
silver
- (c)
aluminium
- (d)
magnesium
The quantity of matter present in an object is called its ___________
- (a)
Mass
- (b)
Volume
- (c)
Density
- (d)
Vapour pressure
Avogadro number represents the number of atoms in ___________
- (a)
12 grams of 12C
- (b)
3320 grams of sulphur
- (c)
32 grams of oxygen
- (d)
1 gram of 12C
2 molecules of nitrogen are represented by ____________.
- (a)
N
- (b)
2N2
- (c)
N2
- (d)
2N
One mole of H2O corresponds to:
- (a)
22.4 litre at 1 atm and 25°C
- (b)
6.02 x 1023 atoms of hydrogen and 6.02 x 1023 atoms of oxygen
- (c)
18 g
- (d)
1 g
Which postulate of Dalton's Atomic theory suggests the law of conservation of mass
- (a)
Atoms cannot be divided
- (b)
All the meter is made up of very small particles called atoms
- (c)
Elements consist of atoms combined in a fixed ratio
- (d)
Atom can neither be created nor be destroyed.
When 5 g of Calcium is burnt in 2 g of Oxygen then 7 g of Calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium reacts with 20 g of oxygen?
- (a)
7g
- (b)
2g
- (c)
25g
- (d)
4g
Hydrogen & Oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?
- (a)
24 g
- (b)
27 g
- (c)
21 g
- (d)
3 g
The symbol of element oxygen is
- (a)
O
- (b)
O2
- (c)
O3
- (d)
None of these
The first scientist to use the symbols of elements was
- (a)
Dalton
- (b)
Berzilius
- (c)
Kanad
- (d)
Proust
Which of the following represents a polyatomic ion
- (a)
Sulphide
- (b)
Chloride
- (c)
Sulphate
- (d)
Nitride
Two elements A (atm wt 75) and B (atm wt. 165) combine to yield a compound.the percentage by weight of A in the compound was found to be 75.08.The formula of the compound is
- (a)
AB
- (b)
AB2
- (c)
A2B
- (d)
A2B3
The number of gram atoms in 8 g of e are
- (a)
2
- (b)
1.204 x 1024
- (c)
3.1 x 1023
- (d)
None of these
The charge in coulombs of 1 gram ion of N3- is (the charge on an electron is 1.602 x 10-19C)-
- (a)
2.894 x 105C
- (b)
3.894 x 105 C
- (c)
2.894 x 106C
- (d)
None of these