Sarkari Naukri

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शुक्रवार, 10 फ़रवरी 2017

GK chemistry, chemistry question

GK chemistry, chemistry question

Father of modern chemistry – Lavoisier.
Citric acid is present in lemon.
Rare gases are monoatomic.
The term PVC used in the plastic industry stands for polyvinyl chloride.
Oil of vitriol is sulphuric acid.
Glycerol is used in the preparation of dynamite.
Gypsum salt is Calcium sulphate.
Bleaching action of chlorine is by decomposition.
Gunpowder is a mixture of potassium nitrate powdered charcoal and sulphur.
Nail polish remover contains acetone.
The isotope atoms differ in the number of neutrons.
Main gas in the air we breathe – Nitrogen (around 78%).
True or false? Acids have a pH level below 7 – Answer: True
What is the first element on the periodic table? Hydrogen
Center of an atom – A Nucleus
Famous New Zealand scientist Ernest Rutherford – Nobel Prize in Chemistry
K is the chemical symbol for which element?Potassium
What is the chemical symbol for gold? Au
True or false? An electron carries a positive charge – False
What orbits the nucleus of an atom? Electrons
At room temperature, what is the only metal that is in liquid form? Mercury
A nuclear reaction where the nucleus of an atom splits into smaller parts is known as nuclear fission or nuclear fusion? Nuclear fission
True or false? A neutron has no net electric charge- True.
H20 – Water.
What is the third most common gas found in the air we breathe? Argon (around 1%)
True or false? Bases have a pH level below 7 False
What is the name given to substances that are initially involved in a chemical reaction? Reactants
Atoms of the same chemical element that have different atomic mass are known as Isotopes
True or false? A proton carries a positive charge – True
Is sodium hydroxide (NaOH) an acid or base?- Base
What is the fourth most abundant element in the universe in terms of mass? Carbon

Horizontal rows in the periodic table are Periods.
In Periodic table vertical columns are called Groups.
Alkali metals belong to Group 1 group in the periodic table.
Alkali metals – reactive metals.
Unreactive non-metals are Noble gases.
Group 0 elements are Unreactive non metals.
The number of Electrons is equal to the number of Protons in its nucleus.
Ions are charged particles that form when atoms Lose or gains electrons.
The atoms in a molecule are joined together by the Covalent bond.
Reactive metals are extracted by Electrolysis.

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