Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que- Li is different from its family members due to____________________? 

a. small size  

b. high charge density  

c. less electropositivity  

d. all of the above 


Answer- all of the above


Que- Carbonates of lithium are not stable like that of sodium due to________________? 

a. Low electronegativity  

b. Low electropositivity  

c. Low charge density  

d. Not known yet 


Answer- Low electropositivity


Que- Which one of the following is not an alkali metal ? 

a. Francium  

b. Caesium  

c. Rubidium  

d. Radium 


Answer- Radium


Que- The element cesium bears resemblance with________________? 

a. Ca  

b. Cr  

c. Both of the above  

d. None of the above 


Answer- None of the above


Que- Downs cell is used to prepare_________________? 

a. Sodium carbonate  

b. Sodium bicarbonate  

c. Sodium metal  

d. Sodium hydroxide 


Answer- Sodium metal


Que- Ammonia may be prepared by heating ammonium chloride with_______________? 

a. Water  

b. NaCl  

c. Aqueous sodium hydroxide  

d. H2SO4 


Answer- Aqueous sodium hydroxide


Que- Crystals of Na2CO3. 10H2O when exposed to air_________________? 

a. Lose water and remain solid  

b. Gain water and remain solid  

c. Gain water and become liquid  

d. Remains unchanged 


Answer- Lose water and remain solid


Que- Which one of the following gives white precipitate with aqueous solution of BaCl2? 

a. NaHCO3  

b. NaNO3  

c. Na2CO3  

d. Na2CrO4 


Answer- Na2CO3


Que- The deliquescence is a property in which a solid____________________? 

a. Absorbs moisture and remains solid  

b. Absorbs moisture and turns to liquid form  

c. Loses water of crystallization  

d. Increases the number of water of crystallization 


Answer- Absorbs moisture and turns to liquid form


Que- In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________? 

a. Hydroxide ions to reach anode  

b. Chlorine gas to mix  

c. Cathode to decay  

d. All of the above 


Answer- Hydroxide ions to reach anode


Que- Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________? 

a. Smaller electronegativity of alkali metals  

b. Smaller ionic radius of these 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 


Answer- De-excitation of electrons from higher energy levels to low energy level


Que- First ionization potential of alkaline earth metal is greater than alkali metals because___________________? 

a. They are more reactive  

b. They have greater atomic radii  

c. They have smaller atomic sizes  

d. All 


Answer- They have smaller atomic sizes


Que- NaOH is named as caustic soda because________________? 

a. It corrodes the organic tissues  

b. It is used in soda water  

c. It reacts with chlorine gas  

d. It reacts with fats to form soap 


Answer- It corrodes the organic tissues


Que- Carnalite has chemical formula__________________? 

a. KCI  

b. KCI.MgCl2.6H2O  

c. Na2B4O7.10H2O  

d. CaCO3.MgCO3 


Answer- KCI.MgCl2.6H2O


Que- Electrolysis of dilute solution of NaCl results at the anode_______________? 

a. sodium  

b. hydrogen  

c. chlorine  

d. oxygen 


Answer- oxygen


Que- Which ion will have maximum value of heat of hydration ? 

a. A1+3  

b. Cs+  

c. Ba+  

d. Mg+2 


Answer- A1+3


Que- Which one is natron ? 

a. Na2CO3  

b. Na2CO3.10H2O  

c. Na2CO3.H2O  

d. NaHCO3 


Answer- Na2CO3.H2O


Que- Which one is least ionic in nature and decompose on heating ? 

a. LiOH  

b. NaOH  

c. KOH  

d. CsOH 


Answer- LiOH


Que- The word Alkali means__________________? 

a. Base  

b. Basic salt  

c. Ashes  

d. Spirit 


Answer- Ashes


Que- Which element is necessary for normal leaf development ? 

a. Si  

b. Ba  

c. Mg  

d. Ca 


Answer- Ca


Que- Nitrates of which pair of elements give different products on thermal decomposition ? 

a. Na K  

b. Mg Ca  

c. Li Na  

d. Li Ca 


Answer- Li Na


Que- Which of the following sulphates is not soluble in water ? 

a. Sodium sulphate  

b. Potassium sulphate  

c. Zinc sulphate  

d. Barium sulphate 


Answer- Barium sulphate


Que- The ore CaSO4.H2O has the general name_______________? 

a. Gypsum  

b. Dolomite  

c. Calcite  

d. Plaster of Paris 


Answer- Gypsum


Que- Which one of the following substances conducts electricity by the movement of ions ? 

a. Graphite  

b. Copper  

c. Molten sodium chloride  

d. Mercury 


Answer- Molten sodium chloride


Que- Which one of the following carbonate is water insoluble ? 

a. Na2CO3  

b. K2CO3  

c. (NH4)2CO3  

d. CaCO3 


Answer- CaCO3


Que- In diaphragm cell hydrogen is discharged by the reduction of__________________? 

a. Water  

b. HCI  

c. Na+  

d. NaCl 


Answer- Water


Que- Gypsum is applied to the soil as a source of________________? 

a. Ca and P  

b. S and P  

c. Ca and S  

d. we could not apply 


Answer- Ca and S


Que- Which one of the following alkali metals forms only normal oxide when it reacts with O2 ? 

a. Lithium  

b. Sodium  

c. Potassium  

d. Rubidium 


Answer- Lithium


Que- Which one of the following pairs shown diagonal relationship in the periodic table ? 

a. Sodium and Lithium  

b. Lithium and magnesium  

c. Lithium and beryllium  

d. Boron and Beryllium 


Answer- Lithium and magnesium


Que- Sodium is not observed in +2 oxidation state because of its__________________? 

a. high first ionization potential  

b. high second ioniation potential  

c. high ionic radius  

d. high electronegativity 


Answer- high second ioniation potential


Que- Magnesium metal does not burn in the vessel containing_______________? 

a. N2  

b. O2  

c. N2 and O2  

d. Ne 


Answer- Ne


Que- Second ionization potential of alkali metals are very high due to_______________? 

a. being s-block elements  

b. inert gas configurations  

c. ns1 electronic configuration  

d. being metals 


Answer- inert gas configurations


Que- Which one can form complex ? 

a. Na  

b. Cr  

c. Li  

d. K 


Answer- Li


Que- During sulphonation of benzene H2SO4 generates the electrophile _________________? 

a. HSO4-  

b. SO2  

c. SO3   

d. H+ 


Answer- SO3 


Que- Which compound will readily undergo sulphonation ? 

a. Benzene  

b. Nitro benzene  

c. Toluene  

d. Chlorobenzene 


Answer- Toluene


Que- Which one of the following statement is not correct about benzene ? 

a. On hydrogenation 208 KJ/mole is liberated  

b. C-H bond length in benzene is 1.09 A?  

c. Molecular mass of benzene is 78.108  

d. Resonance energy of benzene is 150.5 K Cal/mole 


Answer- Resonance energy of benzene is 150.5 K Cal/mole


Que- Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as__________________? 

a. Dows process  

b. Friedel & Craft acylation  

c. Friedel & Craft alkylation  

d. Clemmenson reduction 


Answer- Friedel & Craft alkylation


Que- Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7 ? 

a. Toluene  

b. Ethyl benzene  

c. n-propyl benzene  

d. All 


Answer- All


Que- What is the molecular formula of Benzenetriozonide ? 

a. C6H6O9  

b. C6H5O8  

c. C6H5O9  

d. C6H6O6 


Answer- C6H6O9


Que- The hydrolysis of Benzenetrizonide will yield three moles of____________________? 

a. Glyoxime  

b. Benzaldehyde  

c. Glycol  

d. Glyoxal 


Answer- Glyoxal


Que- In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________? 

a. Hydrogen  

b. Oxygen  

c. Sulphur   

d. OH 


Answer- Sulphur 


Que- Aniline is a derivative of benzene which contains__________________? 

a. Imino group  

b. Amino group  

c. Amide group  

d. Nitro group 


Answer- Amino group


Que- Nitration of chlorobenzene gives___________________? 

a. o – chloronitrobenzene  

b. p – chloronitrobenzene  

c. m – chloronitrobenzene  

d. A & B 


Answer- A & B


Que- By which method the molecular mass of benzene was determined as 78.108 ? 

a. Specific gravity method  

b. Vapour density method  

c. X-ray diffraction method  

d. Distillation methos 


Answer- Vapour density method


Que- Chlorination of toluene in the presence of sublight produces_________________? 

a. Benzyl chloride  

b. o – chlorotoluene  

c. p – chlorotoluene  

d. benzoic acid 


Answer- Benzyl chloride


Que- Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________? 

a. acetylene  

b. N-hexane  

c. Benzene sulphonic acid  

d. Sodium benzoate 


Answer- N-hexane


Que- Which is fused cyclic aromatic compound _____________________? 

a. diphenyl amine  

b. diphenyl methane  

c. naphthalene  

d. biphenyl 


Answer- naphthalene


Que- Acetophenone is a_____________________? 

a. Ether  

b. Ketone  

c. Aldehyde  

d. Ester 


Answer- Ketone


Que- Benzene does not undergo___________________? 

a. Substitution reaction  

b. Addition reaction  

c. Polymerization reactions  

d. Oxidation reactions 


Answer- Polymerization reactions


Que- Nitronium ion is___________________? 

a. NO3  

b. NO  

c. NO2-  

d. NO2+ 


Answer- NO2+


Que- Benzene is heated in air with V2O5 at 450°C it undergoes________________? 

a. Substitution reaction  

b. Addition reaction  

c. Elimination reaction  

d. Oxidation reaction 


Answer- Oxidation reaction


Que- The preparation of benzene from acetylene can also be said as_________________? 

a. Oxidation  

b. Polymerization  

c. Dehydration  

d. Condensation 


Answer- Polymerization


Que- Ozonolysis of benzene produces___________________? 

a. Glycol  

b. Glyoxal  

c. Vicinal diol  

d. Both B & C 


Answer- Glyoxal


Que- Boron is non-netal whereas A1 is metal. It is due to_______________________? 

a. Small size  

b. High nuclear charge  

c. Both A and B  

d. No authorized justification yet 


Answer- Both A and B


Que- One of the outstanding features of boron is its ability to form__________________? 

a. Molecular addition compounds  

b. Molecular crystals  

c. Semiconductors  

d. Ionic compounds 


Answer- Molecular addition compounds


Que- Borax is a white crystalline solid and it is_________________? 

a. More soluble in cold water  

b. More soluble in hot water  

c. Insoluble in water  

d. Soluble only in organic solvents 


Answer- More soluble in hot water


Que- Special features of borate glass is that it is_________________? 

a. Heat resistant  

b. Low melting  

c. Used to prepare chemical garden  

d. Green in colour 


Answer- Heat resistant


Que- Aluminium oxide is_________________? 

a. Acidic oxide  

b. Basic oxide  

c. Amphoteric oxide  

d. It does not exists 


Answer- Amphoteric oxide


Que- Which electronic configuration corresponds to an element of group IIIA ? 

a. 1s2 2s2 2p3  

b. 1s2 2s2 2p6 3s2 3p1  

c. 1s2 2s2 2p4  

d. 1s2 2s2 2p6 3s2 3p6 4s2 3d1 


Answer- 1s2 2s2 2p6 3s2 3p1


Que- In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen? 

a. 4  

b. 2  

c. 1  

d. 6 


Answer- 4


Que- Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C. 

a. 26%  

b. 27%  

c. 37%  

d. <2.6% 


Answer- 37%


Que- Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________? 

a. As nitrometer  

b. To remove air bubbles from molten metal  

c. To produce alloy  

d. As insulator 


Answer- To remove air bubbles from molten metal


Que- Silicon differ from silica by a group of__________________? 

a. Ch3  

b. OH  

c. OCH3  

d. O2 


Answer- Ch3


Que- Boron is non metal while other elements of IIIA group are metals. This is because______________? 

a. it has small size  

b. it has high nuclear charge  

c. it forms molecular addition compounds  

d. all of the above 


Answer- all of the above


Que- The coloured glassy mass in borax bead test is due to the formation of___________________? 

a. metal borate  

b. metal meta borate  

c. metal boride  

d. metal silicate 


Answer- metal meta borate


Que- If temperature of gallium arsenide is increased then its conductivity will___________________? 

a. decrease  

b. increase  

c. remains constant  

d. first decreases then increases 


Answer- increase


Que- Which of the following will decompose to produce litharge_________________? 

a. Pb2O  

b. Pb3O4  

c. PbO2  

d. All of the above 


Answer- Pb3O4


Que- Which of the following is metasilicic acid ? 

a. H2SnO3  

b. H2SiO3  

c. H3AsO4  

d. H3SbO4 


Answer- H2SiO3


Que- Boron in soil has been considered micronutrient for_________________? 

a. Soil porocity  

b. Proper growth of plants  

c. Alkalinity of soil  

d. All 


Answer- Proper growth of plants


Que- Substance which is found in dried up lakes of Tibet and California is_______________? 

a. Tincal  

b. Boric acid  

c. Calcium carbonate  

d. Colemanite 


Answer- Tincal


Que- Which of the following does not give Borax bead test ? 

a. Cu  

b. Cr  

c. Ni  

d. A1 


Answer- A1


Que- The metal which is used in thermite process because of its activity is____________________? 

a. iron  

b. copper  

c. aluminium  

d. zinc 


Answer- aluminium


Que- Which of the following shows inert pair effect ? 

a. boron  

b. carbon  

c. silicon  

d. tin 


Answer- tin


Que- Tincal is a mineral of___________________? 

a. A1  

b. Si  

c. B  

d. C 


Answer- B


Que- Which one of the following is not a semiconductor ? 

a. Si  

b. Ge  

c. Se  

d. Sn 


Answer- Sn


Que- The process of aluminium extraction is called__________________? 

a. Hall process  

b. Thermite process  

c. Haber process  

d. Contact process 


Answer- Hall process


Que- Aqueous solution of borax above 62°C gives crystals of________________? 

a. Na2B4O7.4H2O  

b. Na2B4O7.5H2O  

c. Na2B4O7.2H2O  

d. Na2B4O7.10H2O 


Answer- Na2B4O7.5H2O


Que- Which of the following is not a use of silicon ? 

a. Lubricants  

b. Hydraulic brakes  

c. Antifreeze  

d. Water repellent 


Answer- Antifreeze


Que- CO2 is gas while SiO2 is solid at room temperature? 

a. carbon is non-metal while silicon is semi-metal  

b. CO2 is an independent molecule while SiO2 has network covalent structure  

c. CO2 forms multiple bond while silicon does not form multiple bonds  

d. Silicon has all sigma bonds 


Answer- CO2 is an independent molecule while SiO2 has network covalent structure


Que- Identify the correct statement regarding CO_______________? 

a. it combines with H2O to form carbonic acid  

b. it reacts with red blood cells of haemoglobin  

c. it is powerful oxidizing agent  

d. it is used to prepare aerated drinks 


Answer- it reacts with red blood cells of haemoglobin


Que- Boric acid cannot be used__________________? 

a. As antiseptic in medicine  

b. For washing eyes  

c. In soda bottles  

d. For enamel and glazes 


Answer- In soda bottles


Que- Which element can form tripositive ion ? 

a. Beryllium  

b. Carbon  

c. Silicon  

d. Aluminium 


Answer- Aluminium


Que- Which of the following is different with respect to physical appearance ? 

a. Arsenic  

b. Phosphorus  

c. Antimony  

d. Bismuth 


Answer- Phosphorus


Que- Compounds of nitrogen and phosphorus are mostly________________? 

a. ionic  

b. covalent  

c. polar  

d. all varieties are possible 


Answer- covalent


Que- SO3 is not absorbed in water directly because__________________? 

a. Reaction is exothermic  

b. It is insoluble in water  

c. Dilute acid is produced  

d. All of above 


Answer- Reaction is exothermic


Que- Which of the following will give phosphoric acid one reaction with water_________________? 

a. PCI5  

b. P2O3  

c. P2O5  

d. All of the above 


Answer- All of the above


Que- Phosphorus is a Greek word and it means_________________? 

a. Light bearing  

b. Fire  

c. Impure  

d. Tetrahedral 


Answer- Light bearing


Que- Allotropic form of phosphorus that is poisonous is___________________? 

a. White  

b. Red  

c. Black  

d. Violet 


Answer- White


Que- Acetic anhydride can be obtained by treating ethyl alcohol with___________________? 

a. P2O5  

b. H2SO4  

c. Both A and B  

d. PCI5 


Answer- Both A and B


Que- Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________? 

a. Phosphine  

b. Phosphorus  

c. Water  

d. Phosphorus pentoxide 


Answer- Phosphine


Que- P2O5 is a hygroscopic powder which sublimes at______________? 

a. 260°C  

b. 360°C  

c. 630°C  

d. 620°C 


Answer- 360°C


Que- Phosphoric acid is a weak acid and its basicity is____________________? 

a. 1  

b. 3  

c. zero  

d. 2 


Answer- 3


Que- All the elements in group VIA are ___________________ in nature? 

a. hygroscopic  

b. metals  

c. polymeric  

d. all of above 


Answer- polymeric


Que- Which allotropic form of phosphorous is the most stable ? 

a. White  

b. black  

c. red  

d. Violet 


Answer- black


Que- The chemical composition of cinnabar is__________________? 

a. ZnS  

b. PbS  

c. HgS  

d. FeS 


Answer- HgS


Que- Oxygen and sulphur resemble in all except________________? 

a. Electronic conviguration of valence shell electrons  

b. Show allotropy  

c. Polymeric  

d. Show same oxidation state 


Answer- Show same oxidation state


Que- Arsenic oxides are removed by passing through_________________? 

a. Ferric hydroxide  

b. Sodium hydroxide  

c. Calcium hydroxide  

d. Aluminium hydroxide 


Answer- Ferric hydroxide


Que- When sulphuric acid is treated with ethanol sulphuric acid behaves like________________? 

a. an acid  

b. a dehydrating agent  

c. an oxidizing agent  

d. as sulphonating agent 


Answer- a dehydrating agent


Que- Which one of the followings possesses melting point below 0°C? 

a. Nitrogen  

b. Phosphorus  

c. Carbon  

d. Bismuth 


Answer- Nitrogen


Que- The most electronegative element among the following is_________________? 

a. Sb  

b. N  

c. As  

d. P 


Answer- N

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