Chemistry Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Chemistry Mcqs “. Tab this page to check “Latest Chemistry MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Chemistry in past papers. Past papers of Chemistry mcqs. Past papers of Chemistry MCQs. Chemistry Mcqs are the necessary part of any competitive / job related exams. The Chemistry mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Chemistry mcqs. The Important series of Chemistry Mcqs are given below:
The soul of chemistry is dealing with___________?
A. Internal structural changes in matter
B. Properties of matter
C. Composition of matter
D. Composition and properties of matter
The radioactive isotope of hydrogen is called___________?
A. tritium
B. protium
C. deuterium
D. ortho-hydrogen
Electron was discovered by?
A. James Maxwell
B. Michael Faraday
C. Yuri Gagarin
D. J.J Thomson
Sodium carbonate is produced by____________?
A. decons process
B. Amonia solvay process
C. haber process
D. lead chamber process
Which of the following is a substance?
A. Brass
B. Sea water
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. molecular solids
B. metallic substances
C. ionic substances
D. covalent network solids
All of the following substances are crystalline except_____________?
A. Diamond
B. Ice
C. Sucrose
D. Plastic
Covalent network crystals have_____________?
A. higher melting point then molecular crystals
B. hydrogen bonding
C. discrete molecules linked by Van der waals forces
D. lower melting point then molecular crystals
What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?
A. Glass
B. Paint
C. Gun Powder
D. Cement
Diameter of an atom is in the order of________________?
A. 0.2mm
B. 0.2m
C. 0.2nm
D. 0.2pm
Mass spectrometer is used to determine Mass number of isotopes and___________________?
A. Electronic configuration
B. Relative abundance
C. Atomic number
D. All of the above
The number of peaks obtained in mass spectrometry shows____________________?
A. Average mass of element
B. Relative abundance
C. Number of isotopes
D. Relative isotopic mass
Empirical formula of chloroform is____________________?
A. CH3C1
B. CH2 C12
C. CC14
D. CHCL3
Molecular mass of water (18g) means__________________?
A. 3-gram atoms
B. 1-gram molecule of water
C. 1-mole molecules of water
D. all
Which of the following statements about isotopes is correct ?
A. Isotopes with even atomic number and odd mass no 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 odd atomic number are abundant
One mole of CO2 contains?
A. 22-gram electrons
B. 6.022 x 1023 atoms of oxygen
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. 300
B. 280
C. 154
D. 54
Which of the following terms is not used for ionic compound ?
A. empirical formula
B. formula unit
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. 0.24 mole
C. 0.27 mole
D. 0.09 mole
Which one of the following has the maximum number of isotopes ?
A. carbon
B. oxygen
C. tin
D. chlorine
The volume occupied by 2.8 g of N2 at STP______________________?
A. 2.24 dm3
B. 1.12 dm3
C. 22.4 dm3
D. 112 dm3
The number of moles of CO2 which contains 16 g of oxygen is__________________?
A. 0.75
B. 0.5
C. 0.25
D. 1
How many isotopes have odd atomic number ?
A. 280
B. 154
C. 86
D. 300
Percentage of calcium in calcium carbonate is___________________?
A. 30%
B. 80%
C. 40%
D. 20%
Mostly elements have fractional atomic masses because of______________________?
A. atomic masses are average masses of isobars
B. mass of an atom itself is in fraction
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. haemoglobin
B. sand
C. diamond
D. maltose
Isotopes of the same elements has__________________?
A. same number of neutrons
B. different number of protons
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. heavier
C. intermediate
D. are collected at same time
For which of the following compounds the term empirical formula cannot be applied ?
A. H2O
B. NaCl
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. Atomic mass
B. Mass number
C. Relative abundance
D. all of the above
1 a.m.u =__________________?
A. 1.6 x 10-27 kg
B. 1.6 x 10-26 kg
C. 1.6 x 10-24 kg
D. 1.6 x 10-28 kg
Which of the following are isoelectronic species ?
A. C1- Br- I
B. Li+ Na+ K+
C. H+ H H-
D. F- Ne Na+
Molecular ions are formed by passing______________________?
A. ? – particle
B. High energy electron beam
C. X-rays
D. All of the above
Which one is true about isotope ?
A. Same mass number
B. Same number of neutrons
C. Same physical properties
D. Same chemical properties
Which of the following ion formation is always exothermic ?
A. Uni-negative
B. Di-negative
C. Uni-positive
D. Di-positive
The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?
A. Gas
B. Volatile solid
C. Liquid
D. All
Avogadros number may represent_________________?
A. number of particles
B. volume of particles
C. mass of particles
D. All of the above
Size of molecule depends upon________________?
A. Shape of molecule
B. Atomicity
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. atomic weight
C. mass number
D. relative isotopic mass
Which one of the following is not the mono isotopic element ?
A. iodine
B. uranium
C. arsenic
D. nickel
The mass of decimole of electrons (NA) is___________________?
A. 0.184 mg
B. 1.008 mg
C. 0.054 mg
D. 5.4 mg
Which of the following statements is wrong about isotopes ?
A. they possess same chemical properties
B. they possess different physical properties
C. they possess different mass number
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 volume of elements
D. molar ration of elements
Combustion analysis is performed to determine__________________?
A. Empirical formula
B. Molecular formula
C. Molecular mass
D. Formula mass
Isotopes differ in_________________?
A. properties which depend upon mass
B. chemical properties
C. arrangement of electrons in orbitals
D. all of the above
Which of the following methods is used to estimate hydrogen in an organic compound ?
A. Combustion method
B. Kjeldahls method
C. Dumas method
D. All of the above methods are for different purposes
The nucleus of an atom of every element will always contain____________________?
A. protons and electrons
B. neutrons
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. 1
B. 0.5
C. 1.5
D. 2
Dempsters mass spectrometer has number of zones / parts_________________?
A. 5
B. 3
C. 4
D. 2
All the following variables are used to describle gases except__________________?
A. volume
B. pressure
C. moles
D. density
Methyl alcohol is not used as___________________?
A. an anti freezing agent
B. a solvent
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. 160cm3/min
B. 40cm3/min
C. 20cm3/min
D. 2.5cm3/min
As a substance moves from a solid to a liquid all of the following changes occur except ?
A. intermolecular forces become weaker.
B. K.E of the molecules decreases
C. molecules become more disordered.
D. molecules move more frequently.
The rectified spirit is________________?
A. 90% alcohol
B. 12% alcohol
C. 95% alcohol
D. 100% alcohol
Which of the following solids show anisotropy___________________?
A. Glass
B. Plastic
C. Rubber
D. None of the above
Butyl chloride gives possible isomers ?
A. 3
B. 2
C. 4
D. 5
Metallic crystals are soluble in________________?
A. Non polar solvent
B. Polar solvent
C. Fused metal
D. None
Paramagnetic behaviour of substance is measured by a balance called___________________?
A. Electrical balance
B. Guoys balance
C. Analytical balance
D. Single beam balance
Which of the following properties prove that cathode rays are material in nature_________________?
A. they are negatively charged
B. they possess momentum
C. they cast shadow
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. 0.35 nm
C. 0.34 nm
D. 0.36 nm
When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?
A. 2
B. 1
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. There is maximum of two electrons is an orbital.
C. The electrons in the same atom cannot have the same four quantum numbers
D. None
Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?
A. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
B. 1s2 2s2 2p6 3s2 3p6 3d7
C. 1s2 2s2 2p6 3s2 3p5 3d10
D. 1s2 2s2 2p6 3s2 3p6 4s23d5
Which of the following is mineral fiber ?
A. saran
B. asbestos
C. Teflon
D. acrylic
The hardest of the following solids is__________________?
A. graphite
B. diamond
C. sodium
D. magnesium
Which of the solid does not contain covalent bond__________________?
A. copper
B. diamond
C. ice
D. graphite
The balanced chemical equation for the reaction which occurs when Be is added to water is____________?
A. Be+H2O?Be (OH)2+H2
B. Be+2H2O?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. VBT
B. VSEPR
C. MOT
D. none of the above
Which of the following is not characteristics of reversible reaction__________________?
A. chemical equilibrium is established
B. whole amount of reactant does not change into product
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 10-14
B. 1 x 10-1
C. 1 x 10-7
D. 1
1 mole of electron has mass in microgram_________________?
A. 1.84 x 10-4
B. 5.5 x 10-4
C. 1.008 x 10-3
D. 1.673 x 10-3
The use of antifreeze in the automobile radiator is an important application of__________________?
A. additive property
B. constitutive property
C. colligative property
D. intrinsic property
At which electrode the reduction of the solution is occurring in Al-Ag cell_____________?
A. Both
B. Ag
C. A
D. Neither
In which of the following type of reactions energy of reactant is greater than energy of product________________?
A. unpredictable
B. exothermic
C. endothermic
D. same
Which of following metals can be displaced by all other metals from its solution ?
A. A
B. Ag
C. Au
D. Cu
Which of the elements do not fall in stair case of the modern periodic table__________________?
A. As
B. Si
C. Te
D. None of the above
Across short period the melting and boiling point increase upto __________________?
A. VA group
B. IVA group
C. IIIA group
D. VIA group
Which of the following is the formula of chrome red ?
A. Pb3 O4
B. Pb2O
C. Pb Cr O4 – Pb (OH)2
D. 2Pb CO3 – Pb (OH)2
Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________?
A. Tertiary structure
B. Secondary structure
C. Quantum 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. nb correct for the volume occupied by gas molecules.
B. n2a/v correct for the intermolecular forces.
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. Fehling solution
C. aqueous bromine
D. aqueous NaOH
When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?
A. 2-bromophenol is insoluble in water
B. phenol is unsaturated
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. 273.16K
B. 0?C
C. ?273.16 K
D. ?273.16?C
Benzene is a good solvent for__________________?
A. resins
B. fats
C. iodine
D. all the above
Which of the following element doesnot show allotropy_________________?
A. Arsenic
B. Carbon
C. Nitrogen
D. Sulphur
Purines and pyrimidines are_________________?
A. Carbohydrates
B. Nitrogenous bases
C. Enzymes
D. Lipids
All the transition elements show_________________?
A. Similar chemical properties
B. Similar physical properties
C. Both A and b
D. None
In solids the temperature is the measure of__________________?
A. Translational kinetic energy
B. Vibrational kinetic energy
C. Average kinetic energy of molecules
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 has very low density
B. aluminium can be recycled
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. black
B. pink
C. yellow
D. brick red
What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 ?
A. 6
B. 3
C. 4
D. 2
Which catalyst is used in contact process ?
A. SO3
B. V2O5
C. Fe2O3
D. Ag2O
Which of the following elements has greater 1st ionization energy__________________?
A. C
B. B
C. N
D. O
Which of the following molecule is polar__________________?
A. CO2
B. CCI4
C. BF3
D. none of the above
Which of the following points are important in connection with equilibrium constant ?
A. Kc indicates the extent of reaction but not about the rate of reaction.
B. Kc is unaffected by change in concentration of reactants or products
C. Kc is constant at given temperature
D. All of the above
Solubility of CaF2 is 2.0×10-4 gdm-3 then Ksp of CaF2 is_______________?
A. 2.0 x 10-8
B. 3.2 x 10-11
C. 4.0 x 10-8
D. 4.0 x 10-12
The unit of molality is__________________?
A. gram dm-3
B. moles kg-1
C. moles dm-3
D. none
Consider the following redox reaction. Zn+dil HNO3? Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is__________________?
A. 8
B. 6
C. 10
D. 4
Which of the following elements react with steam to produce H2 gas?
A. Ni
B. Pd
C. Sn
D. All of the above