The correct statement among the following regarding H3PO3 is -

  • Each hydrogen atom is attached to oxygen

  • Two hydrogen atoms are attached to oxygen atoms

  • One atom of H is attached to oxygen

  • None of the above

Strong oxidising agent and strong reducing agents are respectively

  • I2, HF

  • F2, HI

  • Cl2, HCl

  • Br2,HBr

Oxide of a non-metal possesses the following characterstics.

(i) It is both a proton donor and proton acceptor

(ii) It is poor conductor of electricity

(iii) It reacts readily with basic and acidic oxides

(iv) It oxidises Fe at boiling point.

The oxide is

  • H2O

  • CO2

  • H2O2

  • NO

A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas Y with same constituent atoms as that of X is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has triangular pyramidal structure X and Y are

  • SF4 and S2F2

  •   SF6 and  SF4 

  • NaF and NaCl

  •   SF4 and SF6 

Indicate for the CIF3 molecule, the shape and the type of hybridization (of the Cl-atom)
  •   
  •  
  •  
  •  

In the nitrogen family, the H-M-H bond angle in the hybrides MH3 gradually becomes closer to 90o on going from N to Sb. This shows that gradually

  • The basic strength of hybrides increases

  • Almost pure p-orbitals are used for M-H bonding

  • The bond energies of the M-H bond increases

  • The bond pairs of electrons become nearer to the central atom 

Assertion :  In trimethyalamine (N(CH3)3), the nitrogen has a pyramidal geometry, wheres in trisilylamine (N(SiH3)3), it has a planer geometry.

Reason : In trimethylamine, nitrogen shows sp3 hybridization while in trisilyamine it shows sp2 hybridization.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion : Most of the known noble gas compounds are those of xenon.

Reason : The ionisation enthalpy of xenon is very close to that of oxygen.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion : ClF3 exists but FCl3 does not.

Reason :  FCl3 is not formed due to the inability of F to expand its coordination number due to the absence of a vacant d subshell.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion: Among hydrides of the elements of group 16, water shows unusual physical properties.

Reason: Water shows unusual physical properties due to hydrogen bonding between the water molecules.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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The halogen that gives O2 with hot conc. NaOH is -

  • F2

  • Cl2

  • Br2

  • l2

The anhydride of HClO4 among the following is -

  • Cl2O

  • ClO2

  • Cl2O7

  • Cl2O6

Assertion : Fluorine is a stronger oxidizing agent than chlorine.

Reason : Fluorine can displace chlorine from chlorides.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Which of the following pairs of the compound is isostructural?

  •  TeF2 , XeF2

  •  IBr2-, XeF2

  •  IF3 , XeF2

  •  BeCl2 , XeF2

In the structure of ClF3, the number of lone pairs of electrons on central atom 'Cl' is

  • 1

  • 2

  • 3

  • 4

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
  •  Cl2> Br2> F2> l2
  • Br2> l2> F2> Cl2
  • F2> Cl2> Br2> l2
  • l2> Br2> Cl2> F2

Acidity of diprotic acids in aqueous solutions increases in the order:

  • H2S<H2Se<H2Te

  •  H2Se<H2S<H2Te

  •  H2Te<H2S<H2Se

  •  H2Se<H2Te<H2S

A compound among the following that does not give oxygen on heating is -
  • Zn(ClO3)2
  • K2Cr2O7
  • (NH4)2Cr2O7
  • KClO3

The incorrect statement among the following regarding oxoacids of phosphorus is -

  • Orthophosphoric acid is used in the manufacture of triple superphosphate

  • Hypophoshphorous acid is a diprotic acid

  • All oxoacids contain tetrahedral four coordinated phosphorus

  • All oxoacids contain at least one P=O unit and one P-OH group

Sulphur trioxide can be obtained by which of the following reaction

  •  CaSO4+C→∆

  •  Fe2(SO4)3→∆

  •  S+H2SO4→∆

  •  H2SO4+PCl5→∆

Which of the following compounds has the lowest melting point?

  •   CaBr2

  •   Cal2

  •   CaF2

  •   CaCl2

Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively

  • +3, +5, +4

  •  +5, +3, +4

  •  +5, +4, +3

  •  +3, +4, +5

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because :

  • in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction

  •  in NH3  the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions

  •  in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions

  •  in NH3  the atomic dipole and bond dipole is in the opposite directions whereas in NF3 these are in the same directions

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is :

  • 2

  • 3

  • 4

  • 1

Which is the correct thermal stability order for H2EE=O, S, Se, Te and Po?

  •   H2Se<H2Te<H2Po<H2O<H2S

  •   H2S<H2O<H2Se<H2Te<H2Po

  •   H2O<H2S<H2Se<H2Te<H2Po

  •   H2Po<H2Te<H2Se<H2S<H2O

Match the following:

(a) Pure nitrogen (i) Chlorine
(b) Haber process (ii) Sulphuric acid
(c) Contact process (iii) Ammonia
(d) Deacon's process (iv) Sodium azide or Barium azide
The correct matching among the following is -
(a) (b) (c) (d)
1. (iv) (iii) (ii) (i)
2. (i) (ii) (iii) (iv)
3. (ii) (iv) (i) (iii)
4. (iii) (iv) (ii) (i)
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The incorrect statement among the following related to PCl5 is:

  • PCl5 molecules is non-reactive

  • Three equatorial P-Cl bonds make an angle of 120° with each other

  • Two axial P-Cl bonds make an angle of 180° with each other

  • Axial P-Cl bonds are longer than equatorial P-Cl bonds

The correct structure of tribromo octoxide is:

   

 

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  • 2
  • 3
  • 4

Aqua regia reacts with Pt to yield :

  • Pt(NO3)4 

  • H2PtCl6

  • PtCl4 

  • PtCl2

Radon is used in the treatment of:

  • Typhoid

  • Cancer

  • Cough and cold

  • Corona

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Practice Chemistry Quiz Questions and Answers