4HCl + O2 →  X + 2H2O

Cl2 + H2O → HCl  + Y ;

X and Y in the above reaction are respectively:

  •   Cl2 , HOCl

  • HOCl ,Cl2

  • HClO3, HOCl

  • HOCl, HClO4

A neutral molecule that is isoelectronic with ClO- is -

 

  • ClF which is a Lewis base

  • ClF which is a Lewis acid

  • HCl which is a Lewis base

  • HCl which is a Lewis acid

The correct statement(s) regarding group 15 elements is(are):

 

  • The stability of +5 oxidation state decreases down a group.

  • The stability of +3 oxidation state decreases down the group.

  •  First ionization decreases on moving down a group.

  • Both (1) and (3)

The main product(s) formed in the given reaction is/are:

NH4Cl(aq)+NaNO2(aq)→....+H2O(l)+NaCl(aq)

1. NH32. N23. N2H44. Both (1) and(3)
  • 1
  • 2
  • 3
  • 4

The correct statement(s) among the given options is/are:

  • NO2 has more resonating structures as compared to N2O5

  • In the resonating structure of  NO2 molecules positive charge is on the oxygen atom.

  • NO2 has fewer resonating structures than N2O5

  • Both (1) and (2) 

Oxygen exists as gas and sulphur exist as solid because:

  • Oxygen is less electronegative than sulphur.

  • Sulphur is smaller than oxygen molecule.

  • Sulphur has tendency to form pπ - pπ bonds.

  • Oxygen has tendency to form pπ - pπ bonds.

The products formed by the reaction of F2 and Cl2 with water respectively are:

  • HF , HCl

  • H2F2 , HOCl

  • HF, HClO3

  • H2F2, HClO4

NaCl when heated with sulphuric acid in the presence of MnO2, gives:

  • MnO

  • MnCl2

  • Cl2

  • Both (2) and (3)

The correct statement(s) among the following option is/are :

  • Neon gas is filled in discharge tubes with characteristic colours.

  • Neon gas is used in beacon lights.

  •  Argon along with nitrogen is used in gas-filled electric lamps.

  • All of the above.

Statement I:

Acid strength increases in the order given as HF << HCl << HBr << HI.

Statement II:

As the size of the elements F, Cl, Br, I increase down the group, the bond strength of HF, HCI, HBr, and HI decreases and so the acid strength increases.

In the light of the above statements, choose the correct answer from the options given below.

  • Statement I is correct but Statement II is false.

  • Statement I is incorrect but Statement II is true.

  • Both Statement I and Statement II are true.

  • Both Statement I and Statement II are false.

The incorrect statement about noble gases is -

  • Noble gases have weak dispersion forces.

  • Noble gases have large positive values of electron gain enthalpy.

  • Noble gases are sparingly soluble in water.

  • Noble gases have very high melting and boiling points.

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

  • NH3<PH3<AsH3<SbH3 : Increasing acidic character

  • CO2<SiO2<SnO2<PbO2 : Increasing oxidizing power

  • HF<HCl<HBr<HI : Increasing acidic strength

  • H2O<H2S<H2Se<H2Te : Increasing pKa values

O3 can be estimated quantitatively by reacting it with :
  • Iodine
  • Potassium iodide.
  • Chlorine.
  • Sodium chloride.
Statement 1:  SO2 is a sp3 hybridised molecule.
Statement 2:  Two S−O bonds in SO2 are not equal in length.
  • 2. Sttement 1 is false, statement 2 is true.
  • 1. Statement 1 is true , statement 2 is false.
  • 3. Both statements are true.
  • 4. Both statements are false.
Presence of SO2 is detected by :
  • KMnO4
  • KCrO3
  • K2CrO4
  • MnO2
Conditions to maximize the yield of H2SO4 by Contact process is/are :
  • Low temperature.
  • High temperature.
  • High pressure.
  • Both (1) and (3) 
The relation between Ka2 and Ka1 for H2SO4 in water is :
  •  Ka2 << Ka1
  •  Ka2 =  Ka1
  •  Ka2  >> Ka1
  • Can't be defined.
Correct statement among the following regarding flourine is :
  • Fluorine is stronger oxidising agent than chlorine.
  •  Fluorine is weaker oxidising agent than chlorine.
  •  Fluorine is stronger reducing agent than chlorine.
  • Bond dissociation energy of fluorine is more than chlorine.
The anomalous behaviour of fluorine among the following is/are   :
  • Formation of only one oxoacid.
  • High electronegativity.
  • Low electronegativity.
  • Both (1) and (2)

Sea is the greatest source of  :
  • Halogens.
  • Noble gases.
  • Alkaline earth metals.
  • Chalcogens.

The bleaching action of Cl2 is due to formation of :
  • Nascent chlorine.
  • Nascent oxygen.
  • Oxygen gas.
  • Hypochlorous acid.
It is difficult to study the chemistry of Radon because :
  • It is a radioactive substance.
  • It is a very stable substance.
  • Half-life of Radon is longer.
  • It forms variety of compounds.
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