Chemistry Mcqs For CSS, PPSC, NTS, FPSC Test

These Chemistry Mcqs are very important for all tests conducted by the FPSC test, NTS test, PPSC test, SSPC test, and other testing agencies of Pakistan. Here is the list of latest Chemistry MCQs for the preparation of the Government Jobs in Pakistan text exam.

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The soul of chemistry is dealing with___________?

A. Internal structural changes in matter
B. Composition of matter
C. Properties of matter
D. Composition and properties of matter

The radioactive isotope of hydrogen is called___________?

A. tritium
B. deuterium
C. protium
D. ortho-hydrogen

Electron was discovered by?

A. Michael Faraday
B. James Maxwell
C. Yuri Gagarin
D. J.J Thomson

Sodium carbonate is produced by____________?

A. haber process
B. Amonia solvay process
C. decons process
D. lead chamber process

Which of the following is a substance?

A. Sea water
B. Brass
C. Tape water
D. Graphite
E. Sand

Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?

A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids

All of the following substances are crystalline except_____________?

A. Ice
B. Diamond
C. Sucrose
D. Plastic

Covalent network crystals have_____________?

A. higher melting point then molecular crystals
B. lower melting point then molecular crystals
C. discrete molecules linked by Van der waals forces
D. hydrogen bonding

What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?

A. Paint
B. Glass
C. Gun Powder
D. Cement

Diameter of an atom is in the order of________________?

A. 0.2m
B. 0.2mm
C. 0.2nm
D. 0.2pm

Mass spectrometer is used to determine Mass number of isotopes and___________________?

A. Atomic number
B. Relative abundance
C. Electronic configuration
D. All of the above

The number of peaks obtained in mass spectrometry shows____________________?

A. Relative abundance
B. Average mass of element
C. Number of isotopes
D. Relative isotopic mass

Empirical formula of chloroform is____________________?

A. CH2 C12
B. CH3C1
C. CC14
D. CHCL3
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Molecular mass of water (18g) means__________________?

A. 1-mole molecules of water
B. 1-gram molecule of water
C. 3-gram atoms
D. all

Which of the following statements about isotopes is correct ?

A. Isotopes with odd atomic number are abundant
B. Isotopes with odd atomic number and even mass number are abundant
C. Isotopes with even atomic number and even mass number are abundant
D. Isotopes with even atomic number and odd mass no are abundant

One mole of CO2 contains?

A. 6.022 x 1023 atoms of oxygen
B. 22-gram electrons
C. 6.022 x 1023 atms of carbon
D. both B. & C.

The number of isotopes of elements with even mass number and even atomic number are ________________?

A. 280
B. 300
C. 154
D. 54

Which of the following terms is not used for ionic compound ?

A. formula unit
B. empirical formula
C. molecular formula
D. formula mass

moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?

A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole

Which one of the following has the maximum number of isotopes ?

A. oxygen
B. carbon
C. tin
D. chlorine

The volume occupied by 2.8 g of N2 at STP______________________?

A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3

The number of moles of CO2 which contains 16 g of oxygen is__________________?

A. 0.25
B. 0.5
C. 0.75
D. 1

How many isotopes have odd atomic number ?

A. 154
B. 280
C. 86
D. 300

Percentage of calcium in calcium carbonate is___________________?

A. 80%
B. 30%
C. 40%
D. 20%

Mostly elements have fractional atomic masses because of______________________?

A. mass of an atom itself is in fraction
B. atomic masses are average masses of isobars
C. atmoic masses are average masses of isotopes proportional to their relative abundance
D. atmoic masses are average masses of isotopes

Which of the following is not a macromolecule ?

A. sand
B. haemoglobin
C. diamond
D. maltose

Isotopes of the same elements has__________________?

A. different number of protons
B. same number of neutrons
C. different number of neutrons
D. same mass number (nucleon number)

When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?

A. lighter
B. intermediate
C. heavier
D. are collected at same time

For which of the following compounds the term empirical formula cannot be applied ?

A. NaCl
B. H2O
C. CCI4
D. It can be applied to all mentioned above

The properties of an element mosly corresponds to that isotope which has greater_________________?

A. Mass number
B. Atomic mass
C. Relative abundance
D. all of the above

1 a.m.u =__________________?

A. 1.6 x 10-27 kg
B. 1.6 x 10-24 kg
C. 1.6 x 10-26 kg
D. 1.6 x 10-28 kg

Which of the following are isoelectronic species ?

A. H+ H H-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+

Molecular ions are formed by passing______________________?

A. High energy electron beam
B. ? – particle
C. X-rays
D. All of the above

Which one is true about isotope ?

A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. Same chemical properties

Which of the following ion formation is always exothermic ?

A. Uni-negative
B. Uni-positive
C. Di-negative
D. Di-positive

The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?

A. Gas
B. Liquid
C. Volatile solid
D. All

Avogadros number may represent_________________?

A. volume of particles
B. number of particles
C. mass of particles
D. All of the above

Size of molecule depends upon________________?

A. Atomicity
B. Shape of molecule
C. Both A and B
D. Difficult to predict

Which of the following terms is used for the mass of chlorine 35.5 ?

A. relative atomic mass
B. mass number
C. atomic weight
D. relative isotopic mass

Which one of the following is not the mono isotopic element ?

A. arsenic
B. uranium
C. iodine
D. nickel

The mass of decimole of electrons (NA) is___________________?

A. 1.008 mg
B. 0.184 mg
C. 0.054 mg
D. 5.4 mg

Which of the following statements is wrong about isotopes ?

A. they possess different mass number
B. they possess different physical properties
C. they possess same chemical properties
D. they possess different position in the periodic table

Qualitative analysis is carried out for _________________?

A. identification of elements
B. estimation of amounts of elements
C. molar ration of elements
D. molar volume of elements

Combustion analysis is performed to determine__________________?

A. Empirical formula
B. Molecular mass
C. Molecular formula
D. Formula mass

Isotopes differ in_________________?

A. properties which depend upon mass
B. arrangement of electrons in orbitals
C. chemical properties
D. all of the above

Which of the following methods is used to estimate hydrogen in an organic compound ?

A. method
B. Dumas method
C. Kjeldahls method
D. All of the above methods are for different purposes

The nucleus of an atom of every element will always contain____________________?

A. neutrons
B. protons and electrons
C. protons
D. protons and neutrons

When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?

A. 0.5
B. 1
C. 1.5
D. 2

Dempsters mass spectrometer has number of zones / parts_________________?

A. 5
B. 4
C. 3
D. 2

All the following variables are used to describle gases except__________________?

A. pressure
B. volume
C. moles
D. density

Methyl alcohol is not used as___________________?

A. a solvent
B. an anti freezing agent
C. a substitute for petrol
D. for denaturing of ethyl alcohol

Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?

A. 20cm3/min
B. 40cm3/min
C. 160cm3/min
D. 2.5cm3/min

As a substance moves from a solid to a liquid all of the following changes occur except ?

A. molecules become more disordered.
B. K.E of the molecules decreases
C. intermolecular forces become weaker.
D. molecules move more frequently.

The rectified spirit is________________?

A. 12% alcohol
B. 90% alcohol
C. 95% alcohol
D. 100% alcohol

Which of the following solids show anisotropy___________________?

A. Plastic
B. Glass
C. Rubber
D. None of the above

Butyl chloride gives possible isomers ?

A. 2
B. 3
C. 4
D. 5

Metallic crystals are soluble in________________?

A. Polar solvent
B. Non polar solvent
C. Fused metal
D. None

Paramagnetic behaviour of substance is measured by a balance called___________________?

A. Analytical balance
B. Guoys balance
C. Electrical balance
D. Single beam balance

Which of the following properties prove that cathode rays are material in nature_________________?

A. they cast shadow
B. they possess momentum
C. they are negatively charged
D. all of the above

When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?

A. 0.33 nm
B. 0.34 nm
C. 0.35 nm
D. 0.36 nm

When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?

A. 1
B. 2
C. 3
D. 4

Which statement is consistent with Hunds rule ?

A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
B. The electrons in the same atom cannot have the same four quantum numbers
C. There is maximum of two electrons is an orbital.
D. None

Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?

A. 1s2 2s2 2p6 3s2 3p6 3d7
B. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
C. 1s2 2s2 2p6 3s2 3p5 3d10
D. 1s2 2s2 2p6 3s2 3p6 4s23d5

Which of the following is mineral fiber ?

A. Teflon
B. asbestos
C. saran
D. acrylic

The hardest of the following solids is__________________?

A. sodium
B. diamond
C. graphite
D. magnesium

Which of the solid does not contain covalent bond__________________?

A. copper
B. ice
C. diamond
D. graphite

The balanced chemical equation for the reaction which occurs when Be is added to water is____________?

A. Be+2H2O?Be (OH)2+H2
B. Be+H2O?Be (OH)2+H2
C. Be+H2O?[Be (OH)4]+2+H2
D. no reaction

Which of the following theories is superior to others__________________?

A. VSEPR
B. VBT
C. MOT
D. none of the above

Which of the following is not characteristics of reversible reaction__________________?

A. whole amount of reactant does not change into product
B. chemical equilibrium is established
C. a catalyst changes the direction of reaction
D. rate of forward reaction decreases as reaction proceeds

A solution has pH = 0 its H+ ion concentration is__________________?

A. 1 x 10-1
B. 1 x 10-14
C. 1 x 10-7
D. 1

1 mole of electron has mass in microgram_________________?

A. 1.008 x 10-3
B. 5.5 x 10-4
C. 1.84 x 10-4
D. 1.673 x 10-3

The use of antifreeze in the automobile radiator is an important application of__________________?

A. constitutive property
B. additive property
C. colligative property
D. intrinsic property

At which electrode the reduction of the solution is occurring in Al-Ag cell_____________?

A. A
B. Ag
C. Both
D. Neither

In which of the following type of reactions energy of reactant is greater than energy of product________________?

A. endothermic
B. exothermic
C. unpredictable
D. same

Which of following metals can be displaced by all other metals from its solution ?

A. Ag
B. A
C. Au
D. Cu

Which of the elements do not fall in stair case of the modern periodic table__________________?

A. Si
B. As
C. Te
D. None of the above

Across short period the melting and boiling point increase upto __________________?

A. IIIA group
B. IVA group
C. VA group
D. VIA group

Which of the following is the formula of chrome red ?

A. Pb3 O4
B. 2Pb CO3 – Pb (OH)2
C. Pb Cr O4 – Pb (OH)2
D. Pb2O

Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________?

A. Quantum structure
B. Secondary structure
C. Tertiary structure
D. Primary structure

In the van der Waals equation (P + n2a / v2) (v – nb) = nRT which of the following statement is not true ?

A. n2a/v correct for the intermolecular forces.
B. nb correct for the volume occupied by gas molecules.
C. at high densities the equation reduces to the ideal gas law
D. all of the above statements are correct.

The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?

A. alkaline aquenous iodine
B. aqueous bromine
C. Fehling solution
D. aqueous NaOH

When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?

A. phenol is unsaturated
B. 2-bromophenol is insoluble in water
C. a hydroxy group makes the benzene ring more susceptible to electrophilic attack
D. acid-base reaction

If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature exis at________________?

A. 0?C
B. 273.16K
C. ?273.16 K
D. ?273.16?C

Benzene is a good solvent for__________________?

A. fats
B. resins
C. iodine
D. all the above

Which of the following element doesnot show allotropy_________________?

A. Carbon
B. Arsenic
C. Nitrogen
D. Sulphur

Purines and pyrimidines are_________________?

A. Enzymes
B. Nitrogenous bases
C. Carbohydrates
D. Lipids

All the transition elements show_________________?

A. Similar physical properties
B. Similar chemical properties
C. Both A and b
D. None

In solids the temperature is the measure of__________________?

A. Average kinetic energy of molecules
B. Vibrational kinetic energy
C. Translational kinetic energy
D. None of the above

Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?

A. aluminium can be recycled
B. aluminium has very low density
C. aluminium is the most abundant metal in the earth crust
D. aluminium is resistant to corrosion by organic acids.

On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?

A. pink
B. black
C. yellow
D. brick red

What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 ?

A. 6
B. 4
C. 3
D. 2

Which catalyst is used in contact process ?

A. Fe2O3
B. V2O5
C. SO3
D. Ag2O

Which of the following elements has greater 1st ionization energy__________________?

A. B
B. C
C. N
D. O

Which of the following molecule is polar__________________?

A. CCI4
B. CO2
C. BF3
D. none of the above

Which of the following points are important in connection with equilibrium constant ?

A. Kc is constant at given temperature
B. Kc is unaffected by change in concentration of reactants or products
C. Kc indicates the extent of reaction but not about the rate of reaction.
D. All of the above

Solubility of CaF2 is 2.0×10-4 gdm-3 then Ksp of CaF2 is_______________?

A. 4.0 x 10-8
B. 3.2 x 10-11
C. 2.0 x 10-8
D. 4.0 x 10-12

The unit of molality is__________________?

A. moles dm-3
B. moles kg-1
C. gram dm-3
D. none

A solution can be both____________________?

A. dilute and concentrated
B. dilute and saturated
C. saturated and unsaturated
D. saturated and super saturated

Consider the following redox reaction. Zn+dil HNO3? Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is__________________?

A. 6
B. 8
C. 10
D. 4

Which of the following elements react with steam to produce H2 gas?

A. Pd
B. Ni
C. Sn
D. All of the above

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