The texture of 'polythene' is

  • hard and rough
  • hard and smooth
  • soft and rough
  • soft and smooth

Iron sulfide cannot be separated by magnet because iron and sulphur are now

  • physically bonded
  • chemically bonded
  • biologically bonded
  • organically bonded

Compared to liquids, solids are

  • incompressible
  • compressible
  • more compressible than liquids
  • less compressible than liquids

Gases flow

  • slower than solids
  • slower than liquids
  • faster than solids and liquids
  • slower than solids and liquids

The intermolecular force of attraction between molecules in solids are

  • weaker than gases
  • stronger than gases but weaker than liquids
  • stronger than both, liquids and gases
  • weaker than gases but stronger than liquids

The substance which helps in accelerating reaction is called

  • reactors
  • assistors
  • catalysts
  • catalytic enzymes

The kinetic energy in gases is greater than the intermolecular

  • force of attraction
  • force of particles
  • force of elements
  • force of gravity

The color of hydrous copper sulfate is

  • black
  • blue
  • orange
  • white

The kinetic energy in solids is less than the intermolecular

  • force of attraction
  • energy of attraction
  • force of gravity

As compared to low density polythene, the high density polythene can withstand

  • high temperatures
  • low pressures
  • high pressures
  • low temperatures

The particles of gases are

  • packed tightly
  • packed closely
  • small as compared to that of solids and liquids
  • far apart

The color of 'nitrogen' gas is

  • brown
  • red
  • green
  • purple

After sometime the particles of solids start to move far apart, when

  • kinetic energy is greater than thermal energy
  • kinetic energy is greater than force of attraction
  • potential energy is greater than kinetic energy
  • potential energy is greater than thermal energy

Chemical changes are also known as

  • physical reactions
  • chemical reactions
  • biological reactions
  • prominent reactions

When the state of matter is changed from solid to liquid, we call it

  • melting
  • freezing
  • boiling
  • condensing

The name of the inventor who invented plastic is

  • John Dalton
  • John Green
  • Albert Einstein
  • John Hyatt

'Plastics' are

  • nature made
  • self made
  • man made
  • ion-made

The reaction of 'magnesium' with air is

  • exothermic reaction
  • endothermic reaction
  • reversible reaction
  • substitution reaction

A substance which is burned to produce heat and light is known as

  • fuel
  • alcohol
  • acid
  • alkane

The color of solid sulphur is

  • green
  • brown
  • white
  • yellow

A change of state from one form to other is a

  • physical change
  • chemical change
  • biological change
  • state variation

Plastic industry was started when a chemist made a

  • black coating of plastic
  • bakelite
  • solid kerosene plastic
  • plastic with cellulose

Physical changes are

  • reversible
  • irreversible
  • permanent
  • temporary

The reactions of 'exothermic' are

  • condensation reactions
  • endothermic reactions
  • reversible reactions
  • substitution reactions

Ethene dichloride splits up to form

  • dichloride gas
  • vinyl ethene gas
  • vinyl chloride gas
  • diethene gas

'Methane' is an example of

  • carbohydrates
  • hydrocarbons
  • alcohols
  • alkenes

The color of copper sulfate crystals is

  • black
  • blue
  • orange
  • white

If magnesium is gently heated, it forms

  • magnesium oxide
  • magnesium sulfide
  • magnesium nitrite
  • magnesium carbonate

The chemical formula of ethene is

  • C2H4
  • C2H3
  • CH2
  • C3H6

'Plastic' is made of

  • amines
  • alkanes
  • hydrocarbons
  • alcohols
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