NEW
Font size
WorksheetsNOVDEC Chemistry Quiz
Total questions: 25
Worksheet time: 17mins
1. The age of a skeleton can be determined using
X-rays
Gamma rays
Carbon-14
Cobalt 60
Which of the following statements about nuclear reactions is true?
Involves neutrons only
Takes place inside the nucleus
Is governed by temperature and pressure
Involves protons and electrons
The half- life of a radioactive Ra is 1620 years. Calculate the number of years in which 100g of the radioactive Ra will decrease to 25g
3240 years
1620 years
810 years
405 years
Which of the following gases has the weakest van der Waal’s forces?
Cl2
CH4
O2
CO2
The boiling point of H2O is much higher than that of H2S. This difference can best be explained in terms of
Covalent bonding in H2O and H2S
Their relative molecular masses
The shape of the molecules
The hydrogen bonding in H2O
Arrange the compounds NH3, HF, SiH4, and CH4 in increasing order of their boiling points
CH4, SiH4, NH3, HF
HF, NH3, SiH4, CH4
SiH4, HF, CH4, NH3
NH3, HF, SiH4, CH4
Consider the following reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) [H = 1, Mg = 24] If 6.5g of magnesium ribbon reacts completely with hydrochloric acid, how many grams of hydrogen gas would be liberated?
1.40g
1.08g
0.70g
0.54g
What is the percentage by mass of hydrogen in CH3COOH? [CH3COOH = 60]
7.1%
6.7%
5.0%
1.7%
Which of the following compounds has coordinate bonds in its structure?
MgCl2
NaCl
Al2Cl6
AgCl
The properties of a good primary standard include the following except
Readily available.
High degree of purity
Low molecular mass
High molecular mass
Which of the following can be classified as heavy chemical?
CaOCl2
AgNO3
CaO
H2SO4
Which of the following apparatus is not used in volumetric analysis?
Conical flask
Desiccator
Burette
Pipette
The number of electrons in the 3d orbital of 24Cr is
5
4
3
2
Which of the following methods is not used for the separation of mixtures?
Electrolysis
Distillation
Crystallization
Chromatography
The group to which elements belong in the periodic table is determined by the number of
Core electrons
Valence electrons
Valence shells
Electrons
The energy required to break one mole of an ionic crystal into its isolated gaseous ions is the
Atomization energy
Enthalpy of formation
Lattice energy
Sublimation energy
In which of the following bonds is there complete transfer of electrons during its formation?
Covalent bond
Hydrogen bond
Ionic bond
Metallic bond.
How many moles of sodium hydroxide are in 25cm3 of 0.40M of its solution?
0.01
0.02
0.10
0.15
The volume occupied by 0.4g hydrogen gas at stp is
2.24dm3
22.4dm3
44.8dm3
4.48dm3
Which of the following has the greatest number of atoms?
[ H = 1, Ne = 20, Cu = 64, Mg=24]
12g of hydrogen gas
64g of copper metal
2g of neon gas
2.4g of magnesium metal
The mass in grams of ammonia in 200cm3 aqueous ammonia solution of concentration 1.0 mol dm-3 is [Mr(NH3) = 17]
2.0g
3.4g
1.7g
4.0g
2.8dm3 of oxygen gas at stp contains the following number of molecules
0.7525x1023
6.02x1023
3.01x1023
12.10x1023
The periodic table is an arrangement of elements according to their
neutron number
atomic number
mass number
melting point
The vapour density of a gaseous chloride of an element X is 67.5. The percentage of X in the salt is 47.41.
Determine the empirical formula
XCl
XCl2
XCl3
XCl4
Which of the following set of elements have the same outermost electron configuration
I. H, He, Be
II. H, Li, Be
III. H, Li, Na
IV. He, Ne, Ar
I and IV
I and III
III
IV
