Permutit is:

  • hydrated sodium aluminium silicate

  • sodium hexa meta-phosphate

  • sodium silicate

  • sodium meta-aluminate

Hydrogen is not obtained when zinc reacts with:

  • dil. H2SO4

  • dil HCl

  • cold water

  • hot 20% NaOH

The volume strength of 1.5N H2O2 Solution is :

  • 4.8

  • 8.4

  • 3.0

  • 8.0

Density of water is maximum at:

  • 0°C

  • 100 °C

  • 4°C

  • 0 K

Atomic hydrogen is obtained by:

  • electrolysis of heavy water

  • reaction of water with heavy metals

  • thermal decomposition of water

  • passing silent electric discharge through hydrogen at low pressure

In the preparation of hydrogenated oil the chemical reaction involved is called as-

  • Hydrogenation

  • Reduction

  • Dehydration

  • Oxidation

The most abundant isotope of hydrogen is-

  • Tritium

  • Deuterium

  • Protium

  • Para-hydrogen

Hydrogen is evolved by the action of cold dilute HNO3 on:

  • Fe

  • Mg or Mn

  • Cu

  • . Al

A molten ionic hydride on electrolysis gives:

  • H+ ion moving towards the cathode

  • H+ ion moving towards the anode

  • H2 is liberated at anode

  • H2 is liberated at cathode

In solid hydrogen, the intermolecular bonding is:

  • ionic

  • van der Waals'

  • metallic

  • covalent

The lightest gas is :

  • nitrogen

  • helium

  • oxygen

  • hydrogen

10 volumes of H2O2 has a strength of approximately:

  • 3%

  • 30%

  • 10%

  • 5%

Which is not true in case of H2O2?

  • It is more stable in basic solution

  • It acts as strong oxidising agent in acid and basic solutions

  • It is decomposed by MnO2

  • It behaves as reducing agent towards KMnO4

Decmposition of H2O2 is retarded by:

  • acetanilide

  • alcohol

  • H3PO4

  • all of these

Very pure hydrogen (99.9%) can be made by which of the following processes ?

  • Mixing natural hydrocarbons of high molecular weight

  • Electrolysis of water

  • Reaction of salt like hydrides with water

  • Reaction of methane with steam

Para hydrogen at room temperature is:

  • Less stable than ortho hydrogen.

  • More stable than ortho hydrogen.

  • As stable as ortho hydrogen.

  • None of the above.

Hydrogen combines directly with:

  • Ca

  • Cu

  • Zn

  • Fe

Acidified solution of chromic acid on treatement with H2O2 yields :

  •  CrO3 + H2O + O2

  •  Cr2O2 + H2O + O2

  •  CrO5 + H2O + K2SO4

  •  H2Cr2O7 + H2O + O2

What is formed when calcium carbide reacts with heavy water?

  • C2D2

  • CaD2

  • Ca2D2O

  • CD2

Decomposition of H2O2 is accompanied by:

  • decrease in free energy

  • increase in free energy

  • no change in free energy

  • evolution of heat

Ionic hydrides react with water to give:

  • Acidic solutions

  • Basic solutions

  • Hydride ion

  • Protons

A neutral hydride among the following is -

  • H2S

  • H2O

  • H2Se

  • H2Te

Which is used to determine hardness of water volumetrically ?

  • H2C2O4

  • Na2S2O3

  • Sod. citrate

  • Di sodium salt of EDTA

The ratio of electron, proton and neutron in tritium is:

  • 1:1:1

  • 1:1:2

  • 2:1:1

  • 1:2:1

Both temporary and permanent hardness are removed on boiling water with:

  • Ca(OH)2

  • Na2CO3

  • CaCO3

  • CaO

When H2O2 is added to acidic ferrous sulphate solution:

  • electrons are gained by Fe2+

  • electrons are lost by Fe2+

  • there is no loss or gain of electrons

  • iron hydroxide precipitates

Which of the following pairs will not produce dihydrogen gas ?

  • Cu + HCl (dil.)

  • Fe + H2SO4

  • Mg + steam

  • Na + alcohol

When zeolites (hydrated sodium aluminum silicate) is treated with hard water, the sodium ions are exchanged with:

  • H+ ion

  • Ca2+ ion

  •  SO42- ion

  • OH- ion

 The formation of atomic hydrogen from molecular hydrogen will be favoured most at ?

  • High temperature and high pressure

  • Low temperature and low pressure

  • High temperature and low pressure

  • Low temperature and high pressure

The bleaching properties of H2O2 are due to its: 

  • Reducing properties

  • Oxidising properties

  • Unstable nature

  • Acidic nature

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