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WorksheetsChemistry 1st Half Syllabus Test
Total questions: 40
Worksheet time: 3600secs
Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideality?
At high pressure, the collision between the gas molecules become enormous
At high pressure the volume of the gas molecules becomes negligible
At high pressure the gas molecules move only in one direction
At given pressure the intermolecular interaction become significant
At some constant pressure, Vl and V2 are the volumes of a given mass of gas at temperature 300K and 327K respectively. The ratio of V1 / V2 is equal to
54/27
109/100
27/54
100/109
The crystals formed due to the only dipole – dipole forces are
Ionic
Molecular
Covalent
Metallic
An electron occupies the available degenerate orbitals before pairing in any one orbital according to
(n +l) Rule
Pauli’s exclusion principle
Hund’s rule
Heisenberg’s principle
n2 is generally used to determine the maximum
Number of electrons in a shell
Number of electrons in an orbital
Number of orbitals in a sub-shell
Number of orbitals in a shell
The maximum number of electrons having s = +1/2 in 4d subshell are
10
14
5
7
Shape of ionic solid is affected by
Electrostatic force of attraction
Radius ratio
Poor conductivity
All of these
The fourth electron of Be atom will have the four set of quantum numbers as
1, 0, 0, ½
2, 1, 0, +½
2, 0, 0, – ½
1, 1, 1, + ½
Atomic mass unit is the reciprocal of
Molar volume
Mass of electron
Avogadro’s number
Mass of proton
Pure hydrogen gas can be an example of
Element
Substance
Molecule
All of these
Which statement is correct for combustion analysis of organic compound
CO2 is absorbed in KOH and it is physical change
H2O is absorbed in KOH and it is chemical change
H2O is absorbed in Mg(ClO4)2 and it is chemical change
CO2 is absorbed in KOH and it is chemical change
Which of the following is NOT correct in case of kinetic theory of gases
Gases are made up of small particles called molecules
The molecules are in constant motion
When molecules collide, they lose energy
When the gas is heated, the molecules move faster
Study the following table
Which two compounds have least mass of oxygen?
1 and 2
2 and 4
1 and 3
1 and 4
Which of the following is an exothermic process
Sublimation of dry ice
Boiling of water
Freezing of water
Melting of ice
Standard enthalpy of Al2O3 cannot be measured directly because
It does not catch fire
It reacts with CO2
Protective layer of oxide cover the surface
None of above
What is the direction of a reversible reaction when one of the products of reaction is removed from the reaction mixture
Forward
Backward
Direction is not affected
More reactants or produced
The rate constant of a reaction depends upon
Temperature
Weight
Mass
Time
120g of X compound has half-life 30 minutes. The remaining amount of X after 150 minutes is
15g
1.5g
3.75g
7.5g
Heat of formation ( Δ Hof) for CO2 is
-390 kJ/mole
-394 kJ/mole
+394 kJ/mole
-294 kJ/mole
𝟏/𝟐 𝐇𝟐(𝐠) → 𝐇(𝐠) 𝚫𝐇=+𝟐𝟏𝟖𝐊𝐉𝐦𝐨𝐥−𝟏
In this reaction 𝜟𝑯 will be called
Enthalpy of atomization
Enthalpy of decomposition
Enthalpy of formation
Enthalpy of the dissociation
In voltaic cell a salt bridge is used in order to
Pass the electric current
Prevent the flow of ions
Mix solutions of two half cells
Allow movement of ions between two cells
Based on the following reactions, the heat of formation of CO will be
C(graphite) + O2 → CO2(g) , ΔH = –393 kJ/mole and
CO(g)+1/2O2(g) → CO2(g), ΔH = –283 kJ/mole
110 kJ/mol
–110 kJ/mol
676 kJ/mol
–676 kJ/mol
In the combustion of 2.0 g of methane, 104.5 kJ heat is liberated. The heat of combustion of methane would be
+418kJ/mol
–836 kJ/mol
+1254 kJ/mol
+1672 kJ/mol
If the concentration is expressed in mole per dm3 the unit of the rate constant for a first order reaction is
Mol dm–3 s–1
Mol dm–3
Sec–1
Mol–1
Determine the rate law for the reaction from the following initial rate data
2ICl + H2 → I2 + 2HCl
R = k[ICl]2
R = k[H2]2
R = k[ICl]2[H2]2
R = k[ICl][H2]
A chemical equation is balanced in accordance with the law of
Definite proportions
Conservation of energy
Mass action
Conservation of mass
0.25 mole of P4 molecules contains _________ atoms
1.76 × 1023
6.02 × 1019
6.02 × 1023
8.08 × 1023
4 moles of H2 react with 1 mole of O2, the H2O produced will be ______ moles
4
2
1
0.5
3.01 × 1023 atoms of an element weighs 11.5 g. The atomic mass of the element is
10
23
2.3
35.5
Which of the following weighs the least?
24g of Mg
22.4 dm3 of N2
0.1 mole of NO
6.023 × 1024 molecules of O2
A solid Z melts slightly above 273 K and is a poor conductor of heat and electricity It may be
Ionic solid
Molecular solid
Covalent solid
Metallic solid
The ground state electronic configuration of the element which is iso-electronic with H2O
1s2, 2s2, 2p6, 3s2, 3p4
1s2, 2s2, 2p6
1s2, 2s2, 2p6, 3s1
1s2, 2s2, 2p6, 3s2
____________ shows the highest vapour pressure at 20°C
Isopentane
Ethanol
Chloroform
Glycerol
Atoms of two different elements having same nucleon number but different proton number are called
Isotopes
Isobars
Isotones
Isoelectronic
When we distribute the electron in Ca-atom, the shape of valence orbital in which last electron is present is
Spherical
Dumb-bell
Complicated
Has no specific shape
At 17°C, a sample of H2 gas occupies 125cm3. What would be the volume at 307°C by keeping pressure constant
125cm3
250cm3
415cm3
350cm3
Zero absolute is the temperature where
Electronic motion is cased
Translational motion is cased
Nuclear spin is ceased
Molecular motion is ceased
Which of the following does not favors the increasing of vapor pressure?
Increasing temperature
Increasing surface area
Decreasing intermolecular forces
All of these
Hydrogen bonding is most effective in
NH3
C2H5OH
H2O
HF
Ice is less dense than water at
–4°C
4°C
0°C
2°C
