CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 2 - MCQExams.com

An element 'X' atomic number 51 belongs to ______.
  • s-block
  • p-block
  • d-block
  • f-block
Indite is a mineral for the production of ______.
  • indium
  • aluminium
  • boron
  • gallium
Pure air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table.
Which row shows the composition of dry, unpolluted air?
  • nitrogen/ % - 21 ; oxygen/ % - 78; other gases - small amount of carbondioxide
  • nitrogen/ % - 21 ; oxygen/ % - 78; other gases - small amount of carbon monoxide
  • nitrogen/ % - 78 ; oxygen/ % - 21; other gases - small amount of carbon dioxide
  • nitrogen/ % - 7 ; oxygen/ % - 21; other gases - small amount of carbon monoxide
Which has an electron configuration $$1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$$?
  • $$Na^{+}$$
  • $$Al$$
  • $$F$$
  • $$Ti$$
  • $$B$$
Tin metal exists in two allotropic forms.
  • True
  • False
Which of the following member of the carbon family does not have an allotrope?
  • $$Si$$
  • $$Sn$$
  • $$C$$
  • $$Ge$$
In the ground state the carbon atom has .... unpaired electron/ electrons:
  • $$2$$
  • $$3$$
  • $$4$$
  • $$no$$
Tincal contains mainly :
  • $$NaNO_{3}$$
  • $$Na_{2}B_{4}O_{7}.10H_{2}O$$
  • $$Na_{2}CO_{3}$$
  • $$Na_{2}SO_{4}$$
Which of the following is representative group of elements in the periodic table?
  • Lanthanum
  • Argon
  • Chromium
  • Aluminium
Which element has the highest valency with respect to oxygen?
  • Sodium
  • Aluminium
  • Chlorine
  • Sulphur
Which element show more pronounced inert pair effect?
  • N
  • Sn
  • C
  • Pb
The monomer units of silicons, a water repellant, acid resistant and heat resistant polymer, is:
  • $$Si$$
  • $$SiO_{2}$$
  • $$R_{2}Si(OH)_2$$
  • $$RSiOH$$
Non-metals present in borax are:
  • $$B$$
  • $$O$$
  • both $$O$$ and $$B$$
  • $$Na$$
The element whose atomic volume is least is
  • Boron
  • Aluminum
  • Gallium
  • Thallium
Silicon is an important constituent of:
  • chlorophyll
  • haemoglobin
  • rocks
  • amalgams
The least abundant element of IV A group is : 
  • C
  • Si
  • Ge
  • Pb
If the valency shell electronic structure for an element is $$ns^{2} np^5$$, this element will belong to the group of:
  • alkali metals
  • inert metals
  • noble gases
  • halogens
The correct statement with respect to the property of IV A group elements is:
  • their metallic nature decreases from carbon to lead
  • the stability of +2 oxidation state increases from carbon to lead
  • IP value increases from carbon to lead
  • atomic radius decreases from carbon to lead
Which of the following is more stable?
  • $$Pb$$$$^{4+}$$
  • $$Sn$$$$^{4+}$$
  • $$Ge$$$$^{4+}$$
  • $$Si$$$$^{4+}$$
Which element does not show allotropy?
  • Pb
  • Si
  • C
  • Sn
When a mixture of sand and coke is heated at 3723 K, the product formed is :
  • Carborundum
  • Corundum
  • Diamond
  • Coal
Which of the following is solid at room temperature?
  • $$CO$$
  • $$CO_{2}$$
  • $$SiO_{2}$$
  • $$OF_{2}$$
Bond energy is highest for :
  • $$Sn - Sn$$
  • $$Ge - Ge$$
  • $$C - C$$
  • $$Si - Si$$
Silica dissolves readily in:
  • $$HF$$
  • $$HCl$$
  • $$HBr$$
  • $$HNO_{3}$$
Which element does not exhibit allotropy?
  • $$C$$
  • $$Sn$$
  • $$Si$$
  • $$Pb$$
Which of the following is correct?
  • $$GeO_{2}$$ is basic
  • $$SiO_{2}$$ is acidic oxide
  • $$SnCl_{4}$$ is more stable than $$SnCl_{2}$$
  • $$PbCl_{4}$$ is more stable than $$PbCl_{2}$$
Which is the anhydride of orthosilicic acid?
  • Si
  • SiO
  • $$SiO_{2}$$
  • $$SiO_{3}$$
Which compound is solid ?
  • $$CO_{2}$$
  • $$NH_{3}$$
  • $$PH_{3}$$
  • $$SiO_{2}$$
Which is the amorphous form of silica?
  • Quartz
  • Tridymite
  • Onyx
  • Crystobalite
Which is not true about $$SiO_{2}$$:
  • It is a network solid
  • It is attacked by molten NaOH
  • It is attacked by HF
  • It is the basic structural unit of silicates
Whcih one of the following is used as an acidic flux in metallurgy?
  • $$CaO$$
  • $$SiO_{2}$$
  • $$Na_{2}CO_{3}$$
  • $$SO_{2}$$
When $$SiO_{2}$$ is reacted with sodium carbonate, the gas liberated is :
  • $$CO$$
  • $$O_{2}$$
  • $$CO_{2}$$
  • $$O_{3}$$
When  $$\alpha$$-quartz is heated to 575$$^{\circ}$$C, it changes to:
  • onyx
  • $$\beta$$-quartz
  • tridymite
  • crystobalite
The purest form of silica is:
  • quartz
  • flint
  • sand stone
  • jaspar
Which oxide has three dimensional strucutre ?
  • $$CO_{2}$$
  • $$SO_{2}$$
  • CO
  • $$SiO_{2}$$
The final product formed when silica reacts with hydrogen fluoride is :
  • $$SiF$$
  • $$H_{2}SiF_{6}$$
  • $$H_{2}SiF_{4}$$
  • $$H_{2}SiO_{3}$$
The number of Oxygen atoms bonded to each
silicon atom in silica crystal is :
  • 1
  • 2
  • 3
  • 4
Borax is a:
  • tetra hydrate
  • hepta hydrate
  • deca hydrate
  • penta hydrate
The structure of silica is :
  • Layer lattice
  • Tetrahedral
  • Trigonal
  • Linear
Which one of the following is true with respect to $$SiO_{2}$$?
  • Linear, acidic
  • Linear, basic
  • Tetrahedral, acidic
  • Angular, basic
Which oxides has three dimensional structure ?
  • CO
  • $$CO_{2}$$
  • $$SiO_{2}$$
  • $$SO_{2}$$
Organosilicon polymers containing which type of linkages:
  • Si-S-Si
  • Si-O-Si
  • Si-N-Si
  • Si-C-Si
Hybridisation of silicon atom in silica is :
  • sp
  • $$sp^{2}$$
  • $$sp^{3}$$
  • $$sp^{3}d$$
Which is not a true dioxide?
  • $$CO_{2}$$
  • $$SO_{2}$$
  • $$MnO_{2}$$
  • $$SiO_{2}$$
The structure of crystalline silica is similar to that
of:
  • Diamond
  • Graphite
  • Silicates
  • Silicic acid
The major product formed when alkyl chloride when passed over silicon at 300$$^{\circ}$$C in the presence of Cu catalyst?
  • $$R-S-Cl_{2}$$
  • $$R_{2}-SiCl_{2}$$
  • $$R_{2}-SiCl$$
  • $$R_{4}-Si$$
Which of the following is/are not correct?
  • $$SiO_{2}$$is used as acid flux.
  • The distance between the layers in graphite is $$3.35\times10^{-8}$$cm.
  • $$SiO_{2}$$reacts with $$Na_{2}CO_{3}$$ and liberates CO.
  • The hybridization of C in graphite is $$Sp^{2}$$.
Silicones have the general formula :
  • $$SiO_{4}^{4-}$$
  • $$Si_{2}O_{7}^{6-}$$
  • $$(R_{2}SiO)_{n}$$
  • $$(SiO_{3})_{n}^{2-}$$
The example of cyclic silicate is.
  • $$Be_{3} Al_{2}[Si_{6}O_{18}]$$
  • $$Al_{2}(OH)_{4}Si_{2}O_{5}$$
  • $$(Na_{g}[Al_{6}Si_{6}O_{24}]S_{2})$$
  • $$Zn_{2}(SiO_{4})$$
$$SiO_{2}+A\rightarrow X+Y$$ In this reaction 'Y' is one of the global warming gases. 'A' is the water soluble alkali metal carbonate. Whose molecular weight isThe common name of 'X' is :
  • Washing soda
  • Baking soda
  • Flint glass
  • Water glass
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