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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