CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 3 - MCQExams.com

Addition of halogen $$(C{l_2} \ or \ B{r_2})$$ to alkenes goes through formation of :
  • Carbocation
  • Carbanion
  • Cyclic halonium ion
  • Carbon free radical
Alkali metals dissolve in liquid ammonia and produces _______.
  • deep blue solution
  • a solution which are conducting in nature
  • red coloured solution
  • Both $$1$$ and $$2$$
When $$PbO_{2}$$ reacts with conc. $$HNO_{3}$$ , the gas evolved is 
  • $$NO_{2}$$
  • $$O_{2}$$
  • $$N_{2}$$
  • $$N_{2}O$$
Which one of the halogen is prepared by only electrolysis method?
  • $${ Cl }_{ 2 }$$
  • $${ Br }_{ 2 }$$
  • $${ F }_{ 2 }$$
  • $${ I }_{ 2 }$$
which of the following is not characteristic of interhalogen compounds?
  • They are more reactive than halogens.
  • They are covalent in nature.
  • They have low boiling point and are non-volatile.
  • they are diamagnetic.
The basic radial which is detected by the reagent which is also used to detect phosphate is:
  • $$Cd^{2+}$$
  • $$Sn^{2+}$$
  • $$Sb^{3+}$$
  • $$As^{3+}$$
Which of the following product (s) is/are obtained when $$C{I_2}O$$ reacts with $$N{H_3}$$ ?
  • $$N{O_2}$$
  • $${N_2}$$
  • $$NC{I_3}$$
  • $$N{H_4}CI$$
Which one does not liberate $$NH_3$$ when undergoes hydrolysis?
  • Acetanliide
  • Acetonitrile
  • Acetamide
  • Phenyl isocyanide
Which is not correct a reaction?
  • $$XeF_{6}+NaF\rightarrow \left [ XeF_5 \right ]^{+} (2F^{-}) (Na^{+})$$
  • $$Xef6+PF5\rightarrow \left [ XeF_5^{+} \right ]\left [ PF^{-}_6\right ]$$
  • $$XeF_{6}+SbF_{5}\rightarrow \left [ XeF_5^{+} \right ]\left [ SbF_6^{-} \right ]$$
  • $$XeF_{2}+PF_{5}\rightarrow \left [XeF^{+} \right ]\left [ PF_6^{-} \right ]$$
Most reactive form of phosphorus is
  • White phosphorus
  • Red phosphorus
  • Black phosphorus
  • All allotropes are equally reactive
Which of the following statements is correct ?
  • In trisilylamine $$p\pi - d\pi $$ back bonding takes place.
  • These are two $$p\pi - d\pi $$ bonds in molecule.
  • Fraction of s-character in hydride around the central atom in molecule is 0.5
  • $${\left( {{\text{C}}{{\text{H}}_{\text{3}}}} \right)_{\text{3}}}{\text{COH}}$$ is more acidic than $${\left( {{\text{C}}{{\text{H}}_{\text{3}}}} \right)_{\text{3}}}{\text{SiOH}}$$
The correct statement(s) about the oxoacids, $$HCl{O}_{4}$$ and $$HClO$$, is(are):
  • the central atom in both $$HCl{O}_{4}$$ and $$HClO$$ is $$s{p}^{3}$$ hybridized
  • the conjugate base of $$HCl{O}_{4}$$ is weaker base than $${H}_{2}O$$
  • $$HCl{O}_{4}$$ is formed in the reaction between $${Cl}_{2}$$ and $${H}_{2}O$$
  • $$HCl{O}_{4}$$ is more acidic than $$HClO$$ because of the resonance stabilization of its anion
The correct structure of tribromooctaoxide is: 
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Assertion: F is more electronegative than $$Cl$$.
Reason: F has high electron affinity than $$Cl$$.
  • If both assertion and reason are true and the reason is a correct explanation of the assertion
  • If both assertion and reason are true but reason is not a correct explanation of the assertion
  • If the assertion is true but reason is false
  • If both the assertion and reason are false
  • If the assertion is false but the reason is true
Assertion: The fluorine has lower reactivity.
Reason : $$F - F$$ bond has low bond dissociation energy.
  • Both assertion and reason are true and the reason is a correct explanation of the assertion
  • Both assertion and reason are true but reason is not a correct explanation of the assertion
  • Assertion is true but reason is false
  • Both the assertion and reason are false
  • Assertion is false but the reason is true
Inert gases are mixed in iodine vapours. Then there are ________ between them.
  • H-bonding
  • Vander Waal's forces
  • Electrostatic forces
  • Metallic bonds
The strongest oxidising agent is : 
  • $$F_2$$
  • $$Cl_2$$
  • $$I_2$$
  • $$Br_2$$
The correct order of solubility in water for He, Ne, Ar, Kr, Xe is : 
  • $$He > Ne > Ar > Kr > Xe$$
  • $$Xe > Kr > Ar > Ne > He$$
  • $$Ne > Ar > Kr > He > Xe$$
  • $$Ar > Ne > He > Kr > Xe$$
The reaction of $${P}_{4}$$ with $$X$$ leads selectively to $${P}_{4}{O}_{6}$$. The $$X$$ is:
  • dry $${O}_{2}$$
  • a mixture of $${O}_{2}$$ and $${N}_{2}$$
  • moist $${O}_{2}$$
  • $${O}_{2}$$ in presence of aq. $$NaOH$$
For electron affinity of halogens which of the following is correct?
  • $$Br > F$$
  • $$F > Cl$$
  • $$Br < Cl$$
  • $$F < I$$
 The electronic configuration of halogens in their valence shell is:
  • $$\mathrm{n}\mathrm{s}^{2}$$
  • $$\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{6}$$
  • $$\mathrm{n}\mathrm{s}^{0}$$
  • $$\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{5}$$
Fluorine does not show variable oxidation states because_________
  • it is a halogen
  • of absence of d-orbitals
  • absence of s-orbital
  • absence of p-orbitals
Assertion (A): Oxygen exhibits anomalous behavior. 
Reason (R): Absence of d-orbitals
  • Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
  • Assertion is true but Reason is false
  • Assertion is false but Reason is true
Anomalous behaviour of oxygen, compared to other VIA group elements is due to:
  • its high electronegativity
  • its small atomic size
  • non availability of d-orbitals
  • all
The oxidation number of chlorine in KClO is:
  • + 1
  • + 3
  • + 5
  • + 7
The halogen which can form both cations and anions is:
  • F
  • Cl
  • Br
  • I
The number of p-electrons in bromine atom is:
  • 17
  • 7
  • 15
  • 13
Which of the following is not formed in the reaction of Xe with $$F_2$$?
  • $$\mathrm{X}\mathrm{e}\mathrm{O}\mathrm{F}_{4}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{2}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{4}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{6}$$
The halogen which can displace three halogens from their compounds is:
  • $$F$$
  • $$Cl$$
  • $$Br$$
  • $$I$$
Fluorine shows anomalous behavior in VIIA group due to:
  • its small size 
  • high electronegativity
  • absence of d-orbitals
  • all the above
Halogen elements are those which are:
  • diatomic and form $$X^{--}$$ ions
  • monatomic and form $$\mathrm{X}^{-}$$ ions
  • diatomic and form $$\mathrm{X}^{-}$$ ions
  • monoatomic and form $$X^{--}$$ ions
Which is called lazy gas?
  • Kr
  • Ar
  • He
  • Ne
What is the atomic number (Z) of the noble gas that reacts with fluorine?
  • 54
  • 10
  • 18
  • 2
The word Argon represents the term_______
  • Sun
  • Hidden
  • Lazy
  • Stranger
Halogens means:
  • ore forming elements
  • sea salt products
  • inert gases
  • rare gases
The element that oxidizes water to $$\mathrm{O}_{2}$$ with a large evolution of heat is:
  • $$\mathrm{F}_{2}$$
  • $$\mathrm{Cl}_{2}$$
  • $$\mathrm{B}\mathrm{r}_{2}$$
  • $$I_{2}$$
The oxidation state of chlorine in bleaching powder is:
  • -2
  • - 1
  • + 1
  • -1 and + 1
Fluorine does not show positive oxidation states because:
  • it is most electronegative element
  • it forms only anions in ionic compounds
  • it cannot form multiple bonds
  • it shows non-bonded electron pair repulsion due to small size.
$$\mathrm{F}_{2}$$ is better oxidising agent than $$\mathrm{B}\mathrm{r}_{2}$$. It is due to:
  • small size of flourine atom
  • more electron repulsions in flourine
  • higher electronegativity of flourine
  • non-metallic nature of fluorine
The element which can displace three other halogens from their compound is :
  • $$Cl$$
  • $$Br$$
  • $$I$$
  • $$F$$
Which is the lightest gas?
  • Helium
  • Oxygen
  • Hydrogen
  • Nitrogen
Inversion temperature of helium is very low. So when helium is allowed to expand into vacuum it gets:
  • Cooled
  • Heated
  • Neither cooled, nor heated X
  • Liquified
The noble gas which has abnormal behaviour in its liquid state is_______.
  • He
  • Ar
  • Xe
  • Ne
Which of the following are formed by xenon?
  • $$ \mathrm{X}\mathrm{e}\mathrm{F}_{7}$$
  • $$ \mathrm{X}\mathrm{e}\mathrm{F}_{4}$$
  • $$ \mathrm{X}\mathrm{e}\mathrm{F}_{5}$$
  • $$ \mathrm{X}\mathrm{e}\mathrm{F}_{3}$$
Which of the following fluoride(s) of xenon cannot be prepared?
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{2}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{3}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{6}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{7}$$
Viscosity is very low for?
  • Ar
  • Xe
  • He
  • Kr
During fractional evaporation of liquid air, nitrogen comes out as a fraction along with:
  • Ar, Kr, Xe
  • Only Ar
  • He and Ne
  • Kr, Xe
Which of the following compound cannot be prepared?
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{2}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{3}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{4}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{6}$$
The heat of vaporization is very high for ?
  • He
  • Ne
  • Ar
  • Xe
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers