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:
Formalin is ___________ solution of formaldehyde in water?
A. 20%
B. 10%
C. 40%
D. 60%
Acetone reacts with HCN to form a cyanohydrin. It is an example of________________?
A. electrophilic substitution
B. electronphilic addition
C. nucleophilic addition
D. nucleophilic substitution
Which of the following reactions may be assoclated with aldehyde and ketone ?
A. polymerization
B. nucleophile addition
C. oxidation
D. all of the above
Which of the following reagents will react with both aldehydes and ketones ?
A. Grignard reagent
B. Fehlings reagent
C. Tollens reagent
D. Benedicts reagent
Which of the following do not give aldol condensation reactions ?
A. formaldehyde
B. diemthyl ketone
C. acetaldehyde
D. propionaldehyde
Formaldehyde and lactose are combined to produce throat lozenges named as__________________?
A. formamint
B. aldomint
C. lactomint
D. formalactose
Formula of haloform is_________________?
A. CX4
B. HCOX
C. CHX3
D. CH3X
Formalin consists of mixture of formaldehyde methyl alcohol and water Percentage of water in it is________________?
A. 50%
B. 60%
C. 52%
D. 8%
On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?
A. black
B. pink
C. yellow
D. brick red
Aldehyde and ketone have same general formula for homologous series_________________?
A. CnH2n
B. CnH2nO2n
C. CnH2nO
D. CnH2nOn+1
Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter?
A. Cu2Cl2
B. PdCl2
C. CuCl2
D. PbCl2
Acetaldehyele cyanohydrin on acid hydrolysis yields___________________?
A. Propanoic acid
B. Tartaric acid
C. Lactic acid
D. Valeric acid
Which one exhibits aldol condensation____________________?
A. C6H5CHO
B. HCHO
C. Cl3CCHO
D. CH3COCH3
Which of the following is a symmetrical ketone___________________?
A. butanone
B. acetone
C. 3 – hexanone
D. 2-pentanone
Chemistry Mcqs
In base catalyzed reaction of carbonyl compound the catalyst___________________?
A. increases the nucleophilic character of reagent
B. acidic character of reagent
C. increases electrophilic character of carbonyl compound
D. both a and b
A elements are named as alkali metals because_______________?
A. They are found in earth
B. Their oxide and hydroxides are water soluble
C. Both A & B
D. Their oxides are basic
Formula of Chile saltpetre is__________________?
A. NaNO3
B. NH4Cl
C. Ba (NO3)2
D. CaCO3
The oxides of beryllium BeO is_______________?
A. Basic
B. Acidic
C. Amphoteric
D. Neutral
Li is different from its family members due to____________________?
A. high charge density
B. small size
C. less electropositivity
D. all of the above
Carbonates of lithium are not stable like that of sodium due to________________?
A. Low charge density
B. Low electropositivity
C. Low electronegativity
D. Not known yet
Which one of the following is not an alkali metal ?
A. Caesium
B. Francium
C. Rubidium
D. Radium
The element cesium bears resemblance with________________?
A. Cr
B. Ca
C. Both of the above
D. None of the above
Downs cell is used to prepare_________________?
A. Sodium bicarbonate
B. Sodium carbonate
C. Sodium metal
D. Sodium hydroxide
Ammonia may be prepared by heating ammonium chloride with_______________?
A. NaCl
B. Water
C. Aqueous sodium hydroxide
D. H2SO4
Crystals of Na2CO3. 10H2O when exposed to air_________________?
A. Lose water and remain solid
B. Gain water and become liquid
C. Gain water and remain solid
D. Remains unchanged
Which one of the following gives white precipitate with aqueous solution of BaCl2?
A. NaNO3
B. NaHCO3
C. Na2CO3
D. Na2CrO4
The deliquescence is a property in which a solid____________________?
A. Loses water of crystallization
B. Absorbs moisture and turns to liquid form
C. Absorbs moisture and remains solid
D. Increases the number of water of crystallization
In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________?
A. Hydroxide ions to reach anode
B. Cathode to decay
C. Chlorine gas to mix
D. All of the above
Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?
A. Smaller ionic radius of these metals
B. Smaller electronegativity of alkali metals
C. De-excitation of electrons from higher energy levels to low energy level
D. Excitation of electrons from low energy levels to higher energy levels
First ionization potential of alkaline earth metal is greater than alkali metals because___________________?
A. They have greater atomic radii
B. They are more reactive
C. They have smaller atomic sizes
D. All
NaOH is named as caustic soda because________________?
A. It corrodes the organic tissues
B. It reacts with chlorine gas
C. It is used in soda water
D. It reacts with fats to form soap
Carnalite has chemical formula__________________?
A. Na2B4O7.10H2O
B. KCI.MgCl2.6H2O
C. KCI
D. CaCO3.MgCO3
Electrolysis of dilute solution of NaCl results at the anode_______________?
A. hydrogen
B. sodium
C. chlorine
D. oxygen
Which ion will have maximum value of heat of hydration ?
A. A1+3
B. Ba+
C. Cs+
D. Mg+2
Which one is natron ?
A. Na2CO3.10H2O
B. Na2CO3
C. Na2CO3.H2O
D. NaHCO3
Which one is least ionic in nature and decompose on heating ?
A. LiOH
B. KOH
C. NaOH
D. CsOH
The word Alkali means__________________?
A. Basic salt
B. Base
C. Ashes
D. Spirit
Which element is necessary for normal leaf development ?
A. Ba
B. Si
C. Mg
D. Ca
Nitrates of which pair of elements give different products on thermal decomposition ?
A. Mg Ca
B. Na K
C. Li Na
D. Li Ca
Which of the following sulphates is not soluble in water ?
A. Potassium sulphate
B. Sodium sulphate
C. Zinc sulphate
D. Barium sulphate
The ore CaSO4.H2O has the general name_______________?
A. Gypsum
B. Calcite
C. Dolomite
D. Plaster of Paris
Which one of the following substances conducts electricity by the movement of ions ?
A. Copper
B. Graphite
C. Molten sodium chloride
D. Mercury
Which one of the following carbonate is water insoluble ?
A. K2CO3
B. Na2CO3
C. (NH4)2CO3
D. CaCO3
In diaphragm cell hydrogen is discharged by the reduction of__________________?
A. Water
B. Na+
C. HCI
D. NaCl
Gypsum is applied to the soil as a source of________________?
A. S and P
B. Ca and P
C. Ca and S
D. we could not apply
Which one of the following alkali metals forms only normal oxide when it reacts with O2 ?
A. Lithium
B. Potassium
C. Sodium
D. Rubidium
Which one of the following pairs shown diagonal relationship in the periodic table ?
A. Lithium and beryllium
B. Lithium and magnesium
C. Sodium and Lithium
D. Boron and Beryllium
Sodium is not observed in +2 oxidation state because of its__________________?
A. high ionic radius
B. high second ioniation potential
C. high first ionization potential
D. high electronegativity
Magnesium metal does not burn in the vessel containing_______________?
A. O2
B. N2
C. N2 and O2
D. Ne
Second ionization potential of alkali metals are very high due to_______________?
A. ns1 electronic configuration
B. inert gas configurations
C. being s-block elements
D. being metals
Which one can form complex ?
A. Cr
B. Na
C. Li
D. K
Addition of 2% gypsum in cement________________?
A. Triggers hydrolysis
B. Triggers hydration
C. Prevents rapid hardening
D. all of the above
Phenanthrene is a fused polycyclic compound contains __________ benzene rings ?
A. Four
B. Three
C. Two
D. Five
How many electrons are there in benzene to form delocalized electron cloud________________?
A. 4
B. 3
C. 6
D. 8
When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?
A. Chlorine
B. Bromine
C. Fluorine
D. Iodine
Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in________________?
A. The presence of Hydrogen
B. The presence of Oxygen
C. The absence of Oxygen
D. The presence of excessive Oxygen
How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum ?
A. Four
B. Three
C. Two
D. Six
The resonance energy of benzene is__________________?
A. 150.5 kJ/mol
B. 150.5 Cal/mol
C. 250.5 kJ/mol
D. 250.5 Cal/mol
What catalyst is employed when benzene is prepared from acetylene at 70°C?
A. Raney nickel
B. Cr2O3 + A2O3 + SiO2
C. Organo-nickel
D. Ni 250 – 300°C
Which one of the following methods will not give benzene ?
A. Distilling phenol with Zn dust
B. Heating sod. Salt of Benzoic acid with soda lime
C. Chlorobenzene with NaOH at 360°C & 150atm.
D. Hydrolysis of benzene sulphonic acid with super heated steam
Reacting bromine with benzene in the presence of sunlight will result in_______________?
A. The rupturing of benzene ring
B. No-reaction
C. Addition reaction
D. Substitution reaction
During sulphonation of benzene H2SO4 generates the electrophile _________________?
A. SO2
B. HSO4-
C. SO3
D. H+
Which compound will readily undergo sulphonation ?
A. Nitro benzene
B. Benzene
C. Toluene
D. Chlorobenzene
Which one of the following statement is not correct about benzene ?
A. On hydrogenation 208 KJ/mole is liberated
B. Molecular mass of benzene is 78.108
C. C-H bond length in benzene is 1.09 A?
D. Resonance energy of benzene is 150.5 K Cal/mole
Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as__________________?
A. Friedel & Craft acylation
B. Dows process
C. Friedel & Craft alkylation
D. Clemmenson reduction
Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7 ?
A. Ethyl benzene
B. Toluene
C. n-propyl benzene
D. All
What is the molecular formula of Benzenetriozonide ?
A. C6H6O9
B. C6H5O9
C. C6H5O8
D. C6H6O6
The hydrolysis of Benzenetrizonide will yield three moles of____________________?
A. Benzaldehyde
B. Glyoxime
C. Glycol
D. Glyoxal
In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________?
A. Oxygen
B. Hydrogen
C. Sulphur
D. OH
Aniline is a derivative of benzene which contains__________________?
A. Amide group
B. Amino group
C. Imino group
D. Nitro group
Nitration of chlorobenzene gives___________________?
A. p – chloronitrobenzene
B. o – chloronitrobenzene
C. m – chloronitrobenzene
D. A & B
By which method the molecular mass of benzene was determined as 78.108 ?
A. X-ray diffraction method
B. Vapour density method
C. Specific gravity method
D. Distillation methos
Chlorination of toluene in the presence of sublight produces_________________?
A. Benzyl chloride
B. p – chlorotoluene
C. o – chlorotoluene
D. benzoic acid
Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________?
A. Benzene sulphonic acid
B. N-hexane
C. acetylene
D. Sodium benzoate
Which is fused cyclic aromatic compound _____________________?
A. diphenyl methane
B. diphenyl amine
C. naphthalene
D. biphenyl
Acetophenone is a_____________________?
A. Aldehyde
B. Ketone
C. Ether
D. Ester
Benzene does not undergo___________________?
A. Addition reaction
B. Substitution reaction
C. Polymerization reactions
D. Oxidation reactions
Nitronium ion is___________________?
A. NO
B. NO3
C. NO2-
D. NO2+
Benzene is heated in air with V2O5 at 450°C it undergoes________________?
A. Addition reaction
B. Substitution reaction
C. Elimination reaction
D. Oxidation reaction
The preparation of benzene from acetylene can also be said as_________________?
A. Dehydration
B. Polymerization
C. Oxidation
D. Condensation
Ozonolysis of benzene produces___________________?
A. Vicinal diol
B. Glyoxal
C. Glycol
D. Both B & C
Boron is non-netal whereas A1 is metal. It is due to_______________________?
A. High nuclear charge
B. Small size
C. Both A and B
D. No authorized justification yet
One of the outstanding features of boron is its ability to form__________________?
A. Molecular addition compounds
B. Semiconductors
C. Molecular crystals
D. Ionic compounds
Borax is a white crystalline solid and it is_________________?
A. Insoluble in water
B. More soluble in hot water
C. More soluble in cold water
D. Soluble only in organic solvents
Special features of borate glass is that it is_________________?
A. Heat resistant
B. Green in colour
C. Used to prepare chemical garden
D. Low melting
Aluminium oxide is_________________?
A. Basic oxide
B. Acidic oxide
C. Amphoteric oxide
D. It does not exists
Which electronic configuration corresponds to an element of group IIIA ?
A. 1s2 2s2 2p4
B. 1s2 2s2 2p6 3s2 3p1
C. 1s2 2s2 2p3
D. 1s2 2s2 2p6 3s2 3p6 4s2 3d1
In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?
A. 4
B. 1
C. 2
D. 6
Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C.
A. 27%
B. 26%
C. 37%
D. <2.6%
Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________?
A. To produce alloy
B. To remove air bubbles from molten metal
C. As nitrometer
D. As insulator
Silicon differ from silica by a group of__________________?
A. Ch3
B. OCH3
C. OH
D. O2
Boron is non metal while other elements of IIIA group are metals. This is because______________?
A. it has high nuclear charge
B. it has small size
C. it forms molecular addition compounds
D. all of the above
The coloured glassy mass in borax bead test is due to the formation of___________________?
A. metal boride
B. metal meta borate
C. metal borate
D. metal silicate
If temperature of gallium arsenide is increased then its conductivity will___________________?
A. remains constant
B. increase
C. decrease
D. first decreases then increases
Which of the following will decompose to produce litharge_________________?
A. PbO2
B. Pb3O4
C. Pb2O
D. All of the above
Which of the following is metasilicic acid ?
A. H3AsO4
B. H2SiO3
C. H2SnO3
D. H3SbO4
Boron in soil has been considered micronutrient for_________________?
A. Alkalinity of soil
B. Proper growth of plants
C. Soil porocity
D. All
Substance which is found in dried up lakes of Tibet and California is_______________?
A. Tincal
B. Calcium carbonate
C. Boric acid
D. Colemanite
Which of the following does not give Borax bead test ?
A. Cr
B. Cu
C. Ni
D. A1
The metal which is used in thermite process because of its activity is____________________?
A. copper
B. iron
C. aluminium
D. zinc