In chemical reactions, energy is absorbed or released in the form of

  • sound
  • light
  • electricity
  • heat

The reason of low density of gases is

  • number of particles per unit area
  • number of particles per unit volume
  • mass per unit area
  • mass per unit volume

The reaction that gives out heat, while taking place is known as

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

The 'volume' of gases is

  • indefinite
  • definite
  • dependent
  • reduced

A reaction in which liquid freezes and its solid form changes into liquid at same temperature, is called

  • dual side reaction
  • dual side process
  • reversible reaction
  • reversible process

'Bakelite' is used to

  • insulate heater handles
  • increase heat conductivity
  • increase electrical conductivity
  • insulate electrical equipment

The speed of particles is fastest in

  • solids
  • liquids
  • gases
  • fluids

Chemical reactions are

  • reversible
  • irreversible
  • permanent
  • temporary

Polyethene is used to make

  • furniture
  • cooking utensils
  • plastic bags
  • decorative items

Oils is separated from crude oil through the process of

  • simple distillation
  • fractional distillation
  • filtration
  • vaporization

The name of the oil from which ethene is obtained is

  • naphtha
  • kerosene
  • diesel
  • bitumen

The compounds made up of hydrogen and carbon are known as

  • carbohydrates
  • hydrocarbons
  • alkanes
  • alkenes

Cooking food is an example of

  • condensation reaction
  • exothermic reaction
  • reversible reaction
  • endothermic reaction

The freezing point of water is

  • 0 °C
  • 1 °C
  • 100 °C
  • 50 °C

In the process of forming iron sulfide by iron and sulphur, the reactant is

  • iron only
  • sulphur only
  • iron and sulphur both
  • sulphuric acid

The properties of 'plastic' depends on

  • molecules and their arrangement
  • linked atoms
  • type of hydrocarbon
  • properties of elements

The shape of solid is

  • changeable
  • definite
  • irregular
  • regular

'Ethene' is

  • alkane
  • alkene
  • alcohol
  • carboxylic acid

Most of the fuels such as petroleum has

  • carbohydrates
  • fats
  • hydrocarbons
  • metals

Polyethene is

  • good conductor of heat
  • good conductor of electricity
  • poor insulator of electricity
  • good insulator of electricity

The varnish which was originally developed for coating the spars of sailing ships is called

  • spar varnish
  • brown varnish
  • yellow varnish
  • blue varnish

The plastic industry began in

  • 1707
  • 1808
  • 1909
  • 2002

When solids are heated, they

  • expand more than liquids
  • expand more than gases but less than liquids
  • expand more than liquids but less than gases
  • expand less than both liquids and gases

When ethene and chlorine combine together, they form

  • chlorine ethenide
  • ethene chloride
  • ethene dichloride
  • ethene trichloride

The reaction in which heat is taken while taking place, is known as

  • exothermic reaction
  • endothermic reaction
  • reversible reaction
  • substitutive reaction

Large and long molecules made by the linkage of small molecules are known as

  • polyesters
  • polymers
  • polypeptides
  • polysomerism

John Hyatt's invention was about

  • cellulose in wood
  • soil particles under plant roots
  • plant stem
  • barks of wood

Molecules in high density polythene are

  • closely packed than low density polythene
  • far apart than in low density polythene
  • more vigorous than in low density polythene
  • more violent than in low density polythene

Generally methane gas is known as

  • compressed gas
  • liquid gas
  • natural gas
  • artificial gas

Gases are

  • incompressible
  • compressible
  • colorful
  • dense than liquids and solids
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