Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que-  In which of the following pairs are elements belonging to the same group? 

a. Boron & Beryllium

b. Nitrogen & Phosphorous 

c. Magnesium & Aluminium 

d. Gallium & Helium 

Answer- Nitrogen & Phosphorous

Que-  Many properties of an element and its compounds can be predicted from the position of the element in the periodic table. What property could not be predicted in this way? 

a. The nature of its oxides 

b. The charge on its ions 

c. The formula of its oxide 

d. Its number of isotopes 

Answer- Its number of isotopes

Que-  Which one of the following is not a periodic property? 

a. Melting point of elements 

b. Boiling point of elements 

c. Ionization energy of elements 

d. Coordination number of ions 

Answer- Coordination number of ions

Que-  The atomic radii decreases by increasing atomic number in 

a. Alkali metal 

b. Alkaline earth metal 

c. Elements from Li to Ne 

d. Halogens 

Answer- Elements from Li to Ne

Que-  Which discovery caused a revision in the periodic law as stated by Mendeleev? 

a. Location of nucleus by Rutherford 

b. Atomic number by Moseley 

c. X-rays by Roentgen 

d. Natural radioactivity by Henry Bacquerel. 

Answer- Atomic number by Moseley

Que-  An element has electronic conviguration 1s2 2s2 2p2. It belongs to 

a. Group II-A 

b. Group IV-A 

c. Group VII-A 

d. Group VI-A 

Answer- Group IV-A

Que-  The property which increases upto group IV-A then decreases onwards 

a. Ionization energy 

b. Atomic radii 

c. Melting & boiling points 

d. Atomic volume 

Answer- Melting & boiling points

Que-  Which of the following ion is stable in aqueous solution? 

a. H+ 

b. H- 

c. Cl- 

d. All are stable 

Answer- Cl-

Que-  The atoms of same element having same atomic number but different mass number are called 

a. Isobars 

b. Isomers 

c. Isotopes 

d. Isotropes 

Answer- Isotopes

Que-  Deuterium reacts with oxygen to form 

a. Hard water 

b. Heavy water 

c. Soft water 

d. Water gas 

Answer- Heavy water

Que-  Which order of ionization energy is correct 

a. Mg < A1 

b. Si > P 

c. Mg > A1 

d. both b & c 

Answer- Mg > A1

Que-  Ionization energy depends upon 

a. Nuclear charge 

b. Atomic size 

c. Shielding effect 

d. I.E depends upon all of the above and nature of orbital 

Answer- I.E depends upon all of the above and nature of orbital

Que-  Shielding effect across the period 

a. Increases 

b. Decreases 

c. Can not be predicted 

d. Remains constant 

Answer- Remains constant

Que-  Addition of 2nd electron to a uninegative ion is always 

a. Exothermic 

b. Endothermic 

c. Data is insufficient 

d. Unpredictable 

Answer- Endothermic

Que-  Higher value of electron affinity means 

a. Atom will lose electron easily 

b. Atom will gain electron easily 

c. Atom may form di-positive ion 

d. The reason is unknown 

Answer- Atom will gain electron easily

Que-  Metallic characters of alkali metals 

a. Increase down the group 

b. Decrease down the group 

c. No regular trend 

d. Remain same 

Answer- Increase down the group

Que-  Melting points of VII-A group elements down the group 

a. Increase 

b. Decrease 

c. Remain constant 

d. No regular trend 

Answer- Increase

Que-  Oxidation state of an atom represents 

a. Number of electrons gained 

b. Number of electrons lost 

c. Apparent charge in compound 

d. Its vacancies 

Answer- Apparent charge in compound

Que-  Which of the following possesses maximum hydration energy? 

a. Na+ 

b. K+ 

c. Mg+2 

d. Ca+2 

Answer- Mg+2

Que-  Halides in which halogen atoms act as a bridge between two atoms of the other element are called 

a. Covalent halides 

b. Electronegative halides 

c. Polymeric halides 

d. Polymeric hydrides 

Answer- Polymeric halides

Que-  Iodine is solid due to 

a. Strong covalent bond 

b. Large value of dipole moment 

c. High polarizability 

d. Strong hydrogen bonding 

Answer- High polarizability

Que-  True increasing order of acidity of the oxides of Mn is 

a. MnO < MnO2 < Mn2O7 

b. Mn2O7 > MnO2 > MnO 

c. MnO2 > MnO > Mn2O7 

d. MnO2 > Mn2O7 > MnO 

Answer- MnO < MnO2 < Mn2O7

Que-  Keeping in view the size of atom which order is correct one? 

a. Mg > Sr 

b. Ba > Mg 

c. Lu > Ce 

d. C1 > I 

Answer- Ba > Mg

Que-  Which one of the following element has highest exidation state in its compounds? 

a. Cr 

b. Mn 

c. Sn 

d. O 

Answer- Mn

Que-  Which of the following cannot exist in solution 

a. O-2 

b. H+ 

c. Cl- 

d. Na+ 

Answer- O-2

Que-  The word Alkali means 

a. Base 

b. Basic salt 

c. Ashes 

d. Spirit 

Answer- Ashes

Que-  Formula of Chile saltpetre is 

a. NaNO3 

b. CaCO3 

c. Ba (NO3)2 

d. NH4Cl 

Answer- NaNO3

Que-  The oxides of beryllium BeO is 

a. Acidic 

b. Basic 

c. Amphoteric 

d. Neutral 

Answer- Amphoteric

Que-  Which element is necessary for normal leaf development? 

a. Si 

b. Ba 

c. Mg 

d. Ca 

Answer- Ca

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-  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 one of the following is not an alkali metal? 

a. Francium 

b. Caesium 

c. Rubidium 

d. Radium 

Answer- Radium

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 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-  The ore CaSO4.H2O has the general name 

a. Gypsum 

b. Dolomite 

c. Calcite 

d. Plaster of Paris 

Answer- Gypsum

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-  Calcium carbide is prepared by heating lime with coke at 

a. 2500Degree Centigrade 

b. 2600Degree Centigrade 

c. 2700Degree Centigrade 

d. 2800Degree Centigrade 

Answer- 2800Degree Centigrade

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 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-  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 hydrogen is discharged by the reduction of 

a. Water 

b. HCI 

c. Na+ 

d. NaCl 

Answer- Water

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-  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-  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-  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-  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-  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-  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-  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-  Carnalite has chemical formula 

a. KCI 

b. KCI.MgCl2.6H2O 

c. Na2B4O7.10H2O 

d. CaCO3.MgCO3 

Answer- KCI.MgCl2.6H2O

Que-  Magnesium metal does not burn in the vessel containing 

a. N2 

b. O2 

c. N2 and O2 

d. Ne 

Answer- Ne

Que-  Electrolysis of dilute solution of NaCl results at the anode 

a. sodium 

b. hydrogen 

c. chlorine 

d. oxygen 

Answer- oxygen

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 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 can form complex? 

a. Na 

b. Cr 

c. Li 

d. K 

Answer- Li

Que-  Which one is natron? 

a. Na2CO3 

b. Na2CO3.10H2O 

c. Na2CO3.H2O 

d. NaHCO3 

Answer- Na2CO3.H2O

Que-  Addition of 2% gypsum in cement 

a. Triggers hydration 

b. Triggers hydrolysis 

c. Prevents rapid hardening 

d. all of the above 

Answer- Prevents rapid hardening

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

a. LiOH 

b. NaOH 

c. KOH 

d. CsOH 

Answer- LiOH

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

a. Cu 

b. Cr 

c. Ni 

d. A1 

Answer- A1

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

a. iron 

b. copper 

c. aluminium 

d. zinc 

Answer- aluminium

Que-  Aluminium oxide is 

a. Acidic oxide 

b. Basic oxide 

c. Amphoteric oxide 

d. It does not exists 

Answer- Amphoteric oxide

Que-  Which of the following shows inert pair effect? 

a. boron 

b. carbon 

c. silicon 

d. tin 

Answer- tin

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-  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-  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-  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-  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-  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 of the following will decompose to produce litharge 

a. Pb2O 

b. Pb3O4 

c. PbO2 

d. All of the above 

Answer- Pb3O4

Que-  Which element can form tripositive ion? 

a. Beryllium 

b. Carbon 

c. Silicon 

d. Aluminium 

Answer- Aluminium

Que-  Which of the following is metasilicic acid? 

a. H2SnO3 

b. H2SiO3 

c. H3AsO4 

d. H3SbO4 

Answer- H2SiO3

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-  Tincal is a mineral of 

a. A1 

b. Si 

c. "B" 

d. "C" 

Answer- "B"

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-  Which one of the following is not a semiconductor? 

a. Si 

b. Ge 

c. Se 

d. Sn 

Answer- Sn

Que-  Orthoboric acid is 2.6% soluble in water at 40Degree Centigrade and ________at 107Degree Centigrade. 

a. 26% 

b. 27% 

c. 37% 

d. <2.6% 

Answer- 37%

Que-  The process of aluminium extraction is called 

a. Hall process 

b. Thermite process 

c. Haber process 

d. Contact process 

Answer- Hall process

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-  Aqueous solution of borax above 62Degree Centigrade 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-  Which of the following is different with respect to physical appearance? 

a. Arsenic 

b. Phosphorus 

c. Antimony 

d. Bismuth 

Answer- Phosphorus

Que-  Which one of the followings possesses melting point below 0Degree Centigrade? 

a. Nitrogen 

b. Phosphorus 

c. Carbon 

d. Bismuth 

Answer- Nitrogen

Que-  Compounds of nitrogen and phosphorus are mostly 

a. ionic 

b. covalent 

c. polar 

d. all varieties are possible 

Answer- covalent

Que-  The most electronegative element among the following is 

a. Sb 

b. N 

c. As 

d. P 

Answer- N

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-  Phosphene gas will be produced if phosphorous acid is subjected to 

a. Oxidation 

b. Reduction 

c. Decomposition 

d. Both b & c 

Answer- Both b & c

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-  Which one of following is not a property of pure quartz? 

a. Coloured solid 

b. Brittle 

c. Hard 

d. All of above 

Answer- Coloured solid

Que-  Phosphorus is a Greek word and it means 

a. Light bearing 

b. Fire 

c. Impure 

d. Tetrahedral 

Answer- Light bearing

Que-  Which of the following does not contain phosphorus? 

a. Yolk of egg 

b. Bone 

c. Nerves 

d. Steel 

Answer- Steel

Que-  Allotropic form of phosphorus that is poisonous is 

a. White 

b. Red 

c. Black 

d. Violet 

Answer- White

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