Q1. Which among the following is an endothermic reaction?
(a) Respiration a
(d) Burning of natural gas
Q2. _______ fiber is used in making bristles for brushes.
Q3. Acids turn ______ litmus _______.
(a) red, blue
(b) green, yellow
(c) blue, red
(d) yellow, green
Q4. Automobile exhaust leads to a poisonous pollutant
(a) Carbon Dioxide
(b) Sulphur Dioxide
(c) Carbon Monoxide
(d) Nitrous Oxide
Q5. What is the full form of PVC?
(a) Phosphonil vinyl Carbonate
(b) Polyvinyl S Carbonate
(c) Polyvinyl Carbonate
(d) Polyvinyl Chloride
Q6. Aromatic hydrocarbons contain at least _____ benzene like ring in their molecules.
Q7. Chromite is an ore/mineral of –
Q8. What happens in an oxidation reaction?
(a) Protons are lost.
(b) Electrons are lost
(c) Neutrons are lost
(d) Electrons are gained
Q9. Who discovered Nitrogen?
Q10. Haematite is an ore/mineral of
Sol. Endothermic process describes a process or reaction in which the system absorbs energy from its surroundings. Sweating is a endothermic reaction.
Sol. Nylon 66 is a type of polyamide or Nylon. It is used in plastic Industries in making bristles for brushes.
Sol. Acid turns blue litmus paper red.
Sol. Carbon Monoxide is a colorless, odorless, tasteless gas that’s produced during incomplete combustion of any fuel. It is a pollutant released by automobiles.
Sol. PVC stands for Poly Vinyl Chloride. It is a synthetic plastic polymer which is produced by polymerization of vinyl chloride. Its chemical formula is CH2=CHCl. PVC is a thermoplastic material.
Sol. Aromatic hydrocarbons contain at least one benzene like ring in their molecules.
Sol. Chromite is the only ore of chromium, a metal essential for making stainless steel, nichrome, chromeplating, pigments, refractories, chemicals and pharmaceuticals.
Sol. Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
Sol. Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
Sol. Hematite is colored black to steel or silver-gray, brown to reddish-brown, or red. It is mined as the main ore of iron.
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