FBQ1: ___________ are formed by combination of carbon with some transition metals.
Answer: Interstitial carbides

FBQ2: Halogens exhibit variable oxidation states due to the availability of vacant d orbitals _________.
Answer: Flourine

FBQ3: Among the halogens _________  can oxidise all the other halide ions to their respective elements.
Answer: Flourine

FBQ4: The number of covalent bond formed by the halogens is _______.
Answer: 1

FBQ5: ________ means salt producer.
Answer: Halogen

FBQ6: The ability to remove electrons makes halogens__________
Answer: Strong oxidizing agents

FBQ7: _____ is the main types of halides formed by Group 5 elements.
Answer: Trihalides

FBQ8: _______ is obtained commercially from Fractional distillation of liquid air
Answer: Nitrogen

FBQ9: Hydrolysis of silicon tetrachloride gives _____________.
Answer: silicic acid

FBQ10: _________ are fibrous silicates.
Answer: Asbestos

FBQ11: ___________ is obtained by reduction of oxides of tin with carbon.
Answer: Tin

FBQ12: Lead is used in glass and __________ manufacture.
Answer: Cement

FBQ13: ____________ is formed when a mixture of silicates mainly of sodium and calcium is melted and supercooled to a low temperature.
Answer: Glass

FBQ14: Tetrafluoroethene can be polymerized thermally or in aqueous emulsions to a chemically inert plastic known as ______________.
Answer: Polytetrafluoroethene

FBQ15: The simplest fluorocarbon obtained by the reaction of carbon tetrachloride with silver fluoride at 575K is ___________.
Answer: Carbon tetrafluoride

FBQ16: ________ are layer structured silicates.
Answer: Mica

FBQ17: Along the period of the periodic table, the elements with the highest ionisation energies next to the noble gases in the respective periods are the _____________.
Answer: Halogens

FBQ18: Along the period of the periodic table, the elements with the highest electron affinity next to the noble gases in the respective periods are the _____________.
Answer: Halogens

FBQ19: _______ are the most electronegative elements in their respective periods.
Answer: Halogens

FBQ20: When one of the P – P bonds in P4 is broken a polymeric form of phosphorus known as _________ is formed.
Answer: Red phosphorus

FBQ21: The most metallic of the allotropes of phosphorus is __________.
Answer: Black phosphorus

FBQ22: Tetravalent compounds of heavier elements of Group 4 function as Lewis acids and are able to accept electron pairs from bases, because of the availability of __________.
Answer: D orbitals

FBQ23: _________ is formed when nitrogen from air and hydrogen from synthesis gas are reacted together at a high pressure of about 50 atmosphere and at a temperature of 800K in the presence of a finely divided catalyst.
Answer: Ammonia

FBQ24: ___________ is formed when silica is fused with sodium carbonate.
Answer: Water glass

FBQ25: _________ are giant macromolecules consisting of carbon atoms linked by a network of covalent bonds.
Answer: Diamond and graphite

FBQ26: Ammonium ion formed on reaction with H+ has a _________ structure.
Answer: Tetrahedral

FBQ27: Liquid ammonia is a basic solvent because it can easily accept a ___________.
Answer: Proton

FBQ28: In graphite, each carbon forms three bonds with other carbons leaving one electron which is delocalised over the whole planar structure. These delocalised electrons make graphite a good ________.
Answer: Conductor of electricity

FBQ29: The Group 5 element that is stored under water to protect it from oxygen in the air so as not to catch fire is ________.
Answer: Phosphorus

FBQ30: Among the halogens Van der Waals forces of attraction are maximum in ________.
Answer: Iodine

FBQ31: Apart from Sb and Bi the compounds formed by elements of Group 5 are predominantly ___________.
Answer: Covalent

FBQ32: On descending the group of Group 5 elements ionisation energy __________.
Answer: Decreases

FBQ33: The density, melting and boiling points of Group 5 elements _________ with increase in atomic number as you move down the group.
Answer: Increases

FBQ34: Group 5 elements exhibit a highest oxidation state of _________.
Answer: +5

FBQ35: In the gaseous state phosphorus exist as ____________.
Answer: Tetra-atomic molecule

MCQ1: Hydrazine can act as a coordinating ligand forming complexes with metal ions because of _________.
Answer: It has lone pairs of electrons

MCQ2: The tendency of ________ to form multiple bonds easily is due to its high bond energy and small atomic radius.
Answer: Carbon

MCQ3: The compound among the options below with the least bond energy is ___________.
Answer: BiH3

MCQ4: Silica gel is _____________ form of Silicon dioxide.
Answer: Amorphous

MCQ5:  Carbon dioxide is used in fire extinguishers because of ________.
Answer: It does not support combustion

MCQ6: Which one of the following compounds is formed when carbides are decomposed by water or dilute acids?
Answer: Acetylene

MCQ7:  Lightning discharge in the atmosphere converts nitrogen to _________.
Answer: Nitric oxide

MCQ8: Superphosphate of lime is a more effective fertilizer than phosphate rock because of _________.
Answer: Ca(H2PO4)2  is water soluble

MCQ9: _________ are formed by elements of 1,2, 3,11,12 and13 except boron.
Answer: Ionic carbides

MCQ10: Mixed chlorofluorocarbons or CCl2F2, CFCl3, and CF3Cl are used in refrigeration and aerosol propellants because of ______________.
Answer: They are volatile, thermally stable and chemically inert

MCQ11: The small size and high electronegativity makes ________ react with metals of low ionisation energy..
Answer: Nitrogen

MCQ12: Multiple bonds between its atoms make _________ inert at room temperature.
Answer: Nitrogen

MCQ13: Graphite is the ________.
Answer: Softest of the allotropes of carbon

MCQ14: Among the Group 4 elements, moving from carbon to silicon the covalent radius increases sharply afterwards the increase is gradual; this is attributed to the fact that___________.
Answer: As we move down the group upto silicon effective nuclear charge outbalances the effect of  additional shell leading to only a marginal increase in size

MCQ15:  Which of the following statement is true?
Answer: Halogens  exist as non-polar diatomic molecules

MCQ16: Nitrogen is not able to form coordination number beyond four whereas other members of its Group is able to because of _______________.
Answer: P, As, Sb and Bi can attain sp3d2 and sp3d hybridization whereas Nitrogen cannot

MCQ17: _________ occurs in the elemental state as diamond and graphite
Answer: Carbon

MCQ18: _________ is used to create inert atmosphere where the presence of air would involve fire, explosion hazards or undesirable oxidation products.
Answer: Nitrogen

MCQ19: Isolation of fluorine presented a tough problem to chemist before it was finally isolated due to _______.
Answer: High chemical reactivity of fluorine towards other elements

MCQ20: Which of the options below shows how carbon behaves differently from the rest of the elements in its group?
Answer: Carbon is the only element in the group that can form stable derivatives with double and triple bonds

MCQ21: The principal constituents of all rocks, clays and soils are ______.
Answer: Silicates

MCQ22: The purest and most stable form of silica is ____________.
Answer: Quartz

MCQ23: Sandstone, granite and slate are examples of ________.
Answer: Natural silicates

MCQ24: The chief constituent of glass is ____________.
Answer: Silica

MCQ25: The difference between silica and silicate is ________.
Answer: Silica is made of SiO2 units whereas silicate is made of SiO4 unit

MCQ26: All the elements of Group 5 can expand their octet except _____________.
Answer: Nitrogen

MCQ27: In the gaseous state phosphorus exist as _________.
Answer: P4

MCQ28: _____________ is a crystalline form of silica.
Answer: Quartz

MCQ29: The most stable hydride of phosphurous is _________.
Answer: Phosphine

MCQ30: The tendency of gaining an electron to acquire a stable noble gas configuration makes the halogens ________.
Answer: Have high electron affinity

MCQ31: Most Group 4 elements form mostly covalent compounds because of ____________.
Answer: Very large amount of energy is required to form M4+ ion

MCQ32: Diamond is not a conductor of electricity because of ____________.
Answer: It does not have delocalised electrons

MCQ33: The ability of the molecules of graphite held together to slide pass one another imparts in it ______________.
Answer: Softness

MCQ34: Tin exhibit polymorphism because of _____________.
Answer: It exists in two crystalline forms

MCQ35: Diamond behaves as an insulator because of ____________.
Answer: Strong covalent bonds formed within its molecule restricting mobility of electrons