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