CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 6 - MCQExams.com

Which of the following compound is a gas (at $$0^{\circ}C$$) ?
  • $$BF_3$$
  • $$BCI_3$$
  • $$BBr_3$$
  • $$BI_3$$
From the $$B_2 H_6$$, all the following can be prepared except:
  • $$H_3 BO_3$$
  • $$[BH_2(NH_3)_2]^{+} [BH_4]^{-}$$
  • $$B_2(CH_3)_6$$
  • $$NaBH_4$$
Which of the following is a allotrope of carbon?
  • Diamond
  • Graphite
  • Fullerenes
  • Silica
When orthoboric acid $$(H_3BO_3)$$ is heated the residue left is:
  • Boron
  • Metaboric acid
  • Boric anhydride
  • Borax
Correct trend of first lonisation energy in group 13 is: 
  • $$\displaystyle B> Tl> Ga> Al> In$$
  • $$\displaystyle B> Al> Ga> Tl> In$$
  • $$\displaystyle B> Tl> Ga> Al> In$$
  • $$\displaystyle B> Ga> Al> In> Tl$$
What does P, Q & R represent in the given figure of nitrogen cycle ?

315419_a45714ba861a4ae6b95382352c04a0fd.png
  • P Ammonia Q Nitrates R Nitrites
  • P Ammonia Q Nitrites R Nitrates
  • P Nitrites Q Nitrates R Ammonia
  • P Nitrates Q Nitrites R Ammonia
(a) Silicone is a polymeric organo silicon compound which is chemically inert and thermally stable
(b) Silicon carbide can be used as a lubricant.
(c) Silicon dioxide is the raw material for the manufacture of cement as well as glass.
(d) Hardness of $$Si{O}_{2}$$ and $$SiC$$ is due to their regular tetrahedral structure.

Which of the following regarding silicon and its compounds is correct?
  • a and b
  • b and c
  • a, c and d
  • only d
An ecologist studied the effects of sewage effluent on the levels of oxygen concentration, bacterial population and algal growth in a fresh water stream. The given graph is plotted based on his findings.
select the correct statement regarding the given graph.
315469.png
  • There is a fall in oxygen concentration between point Y and 4 km downstream because it is utilized by algae for respiration during day.
  • There is a rise in oxygen concentration between 4 km and 8 km downstream because of oxygen for respiration is lower
  • Bacterial population never recovers from 8 km onwards because all the oxygen is used by algae
  • There is decrease in the level of bacteria between 5 km and 7 km downstream because all the oxygen and organic matter has been used up by algal population
Which of the following is a water-borne disease :
  • Malaria
  • Dysentery
  • Pneumonia
  • Breathlessness
Elements of group 14 :
  • exhibit oxidation state of +4 only
  • exhibit oxidation state of +2 and +4
  • form $$M^2$$ and $$M^{4+}$$ ions
  • form $$M^{2+}$$ and $$M^{4+}$$ ions
Pnicogens are the elements of group:
  • $$15$$
  • $$13$$
  • VIII
  • Zero
An aqueous solution of borax is :
  • neutral
  • amphoteric
  • basic
  • acidic
In diborane, the two H-B-H angles are nearly :
  • $$60^o, 120^o$$
  • $$90^o, 120^o$$
  • $$95^o,150^o$$
  • $$120^o, 180^o$$
Order of reactivity of halogen acids towards an alcohol is:
  • HCl > HBr > HI
  • HBr > HI > HCl
  • HI > HBr > HCl
  • HI > HCl > HBr
Coordination number of aluminium is:
  • 8
  • 6
  • 12
  • 4
Which of the following is known as dead burnt?
  • Gypsum
  • Plaster of Paris
  • Anhydrite
  • None of these
Apatite is an ore of:
  • fluorine.
  • chlorine.
  • bromine.
  • iodine.
Which of the following forms vortex ring?
  • $$P_{2}O_{5}$$
  • $$PH_{3}$$
  • $$NH_{3}$$
  • $$P_{2}O_{10}$$
The stable bivalency of $$Pb$$ and trivalency of $$Bi$$ is :
  • due to d contraction in $$Pb$$ and $$Bi$$
  • due to relativistic contraction of the $$6s$$ orbitals of $$Pb$$ and $$Bi$$, leading to inert pair effect
  • due to screening effect
  • due to attainment of noble liquid configuration
 Argyrodite, briartite contain appreciable amounts of  _____?
  • lead
  • germanium
  • zinc
  • copper
All hydrocarbons contain _____.
  • carbon
  • germanium
  • antimony
  • water
Diamond is a allotrope of _______.
  • carbon
  • lead
  • antimony
  • germanium
In clatherates of xenon with water, the nature of bonding between xenon and water molecule is :
  • Dipole induced dipole interaction
  • Coordinate
  • Hydrogen bonding
  • Covalent
A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. An identical reverse bias is applied across the diodes
  • The reverse current in Ge is larger than that in Si
  • The reverse current in Si is larger than that in Ge
  • The reverse current is identical in the two diodes
  • The relative magnitude of the reverse currents cannot be determined from the given data only
Which of the following shows bond in silicone?
  • $$Si-C-Si-C-Si$$
  • $$Si-Si-Si-Si$$
  • $$-Si-O-Si-O-Si$$
  • $$Si-C-Si-O-Si$$
Which of the following metals has the largest abundance in the earth's crust?
  • Aluminium
  • Calcium
  • Magnesium
  • Sodium
Boiling point increases in order $$CH_4$$ < $$SH_4$$ < $$GeH_4$$ because :
  • atomic number of central metal atom increases
  • molecular mass increases
  • dipole - dipole interaction increases
  • bond length increases
Why carbon can form stable $$C = C$$ bond where as silicon can't form $$Si = Si$$ ?
  • Poor overlap of $$p\pi - d\pi$$ in silicon
  • Poor overlap of $$p-s$$ in silicon
  • Poor overlap of $$p\pi-s$$ in silicon
  • Silicon do not have vacant orbital
Which of the following correctly represents the variation of electronegativity (EN) with atomic number (Z) of group 13 elements?
Electronegativity of group 13 elements follow the order :
  • B > Ca >Al > Th > In
  • B > Th> Ga > Al > In
  • B > Th> In > Ga > Al
  • B > Al > Th > In > Ga

A type of ion found in aluminum oxide is :
  • $$X^+$$
  • $$X^{2+}$$
  • $$X^{3+}$$
  • $$XO_3^{2-}$$
  • $$XO_4^{2-}$$
Heavier elements of p-block do show higher order oxidation state because of :
  • lanthanide contraction
  • inert pair effect
  • screening effect
  • absence of vacant d-orbital
Out of $$HClO, HBrO$$ and $$HIO$$ which one is most acidic :
  • $$HBrO$$
  • $$HClO$$
  • $$HIO$$
  • All are equally acidic
Which is only metal in group 15?
  • Phosphorus
  • Arsenic
  • Antimony
  • Bismuth
Which of the following do not have linear structure?
  • $$CO_2$$
  • $$N_2O$$
  • $$BeF_2$$
  • $$SnCl_2$$
$$\displaystyle Al{ H }_{ 3 }$$ is an example for :
  • interstitial hydride
  • electron rich hydride
  • ionic hydride
  • electron deficient hydride
Which of these forms nitride with nitrogen at higher temperature?
  • Aluminium
  • Boron
  • Both $$A$$ and $$B$$
  • Indium
Amphoteric oxide is:
  • $$Al_2O_3$$
  • $$SiO_2$$
  • $$P_4O_{10}$$
  • $$ClO_7$$
Why $$Bi^{3+}$$ more stable than $$Bi^{+5}$$?
  • Due to inert pair effect
  • Due to inert gas electronic configuration
  • Due to half filled configuration
  • Due to lanthanide Contraction
Straight chain silicones are prepared by hydrolysis by:
  • $$R_2SiCl_2$$
  • $$R_3SiCl$$
  • $$RSiCl_3$$
  • $$R_2Si$$
Which one of the following is paramagnetic in nature?
  • $$NO$$
  • $$N_2O$$
  • $$N_2O_5$$
  • All of the above
Which of the following metal will give $$N_2O$$ on reaction with dilute nitric acid?
  • $$Zn$$
  • $$Cu$$
  • $$Hg$$
  • $$Ag$$
Which of the following statement is correct?
  • The 1st ionisation enthalpy of group 13 elements is less than that of group 2 elements
  • The 1st ionization enthalpy of group 16 elements is more than of group 15 elements.
  • Germanium is non-metal
  • $$ClO_7$$ is amphoteric oxide
Which of the following is not pseudo halogen? 
  • $$(CN_2)$$
  • $$(SCN_2)$$
  • $$(OCN)_2$$
  • $$H_2$$
What is the oxidation state of nitrogen in $$N_2O_5$$?
  • 5
  • 10
  • 4
  • 3
Phosphorus pentaoxide reacts with $$H_2O$$ to form an acid. What is the basicity of that acid?
  • 1
  • 3
  • 2
  • 4
At standard conditions_______ has an allotropic form that is a good electrical conductor.
  • carbon
  • nitrogen
  • oxygen
  • neon
  • argon
Examples of silicate minerals in the crust include:
  • pyroxene
  • mica
  • amphibole
  • cassertite
Quartz, $$\displaystyle Si{ O }_{ 2 }$$, has a high melting point and is insoluble in most solvents. Which type of force best accounts for the physical properties of quartz?
  • Hydrogen bonding
  • Covalent bonding
  • Ionic bonding
  • Pi bonding
  • Dispersion forces
The oxidation state(s) shared by each of the elements in group IV $$(C, Si, Ge, Sn$$ and $$Pb)$$ is/are
  • $$+2$$
  • $$+4$$
  • $$+2, +4$$
  • $$-2, +2$$
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