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HCS (Haryana)Prelims2019General Studies
Question
A high molecular weight compound formed by combining large numbers of small molecules of low molecular weight is called:
Options
- A Polymer
- B Alkali
- C Acid
- D Direct Dyes
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Correct Answer
A Polymer
Model Answer
- A high molecular weight compound formed by combining large numbers of small molecules of low molecular weight is called Polymer.
- A polymer is a large molecule composed of many repeated subunits, known as monomers.
- Because of their broad range of properties, both synthetic and natural polymers play an essential and ubiquitous role in everyday life.
- Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins, that are fundamental to biological structure and function.
- Polymers, both natural and synthetic, are created via the polymerisation of many monomers.
- Their large molecular mass relative to small molecular compounds produces unique physical properties, including toughness, viscoelasticity and a tendency to form glasses and semicrystalline structures rather than crystals.
- Hence, Option 1 is correct.
- Direct Dyes are a water-soluble dye usually of the azo class that is used in alkaline or neutral solution especially for dyeing cellulosic material directly.
- The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
- Together with hydrogen, they constitute group 1, which lies in the s-block of the periodic table.