CHEMISTRY

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UPSC, PSC, BANK, RAILWAY,etc. Examination Questions

Chemistry questions including Kerala Administrative Service (KAS), Secretariat Assistant, Panchayath Secretary, BDO, Auditor, Assistant, LDC and LGS examination level questions. You need a lot of experience in taking an online exam.

1.

.The meaning of the word 'atom' is

Ans:-Indivisble


2.

.The term 'atom' was first introduce by

Ans:-Ostward


3.

.The first atomic theory was postulated by

Ans:-John Dalton ( in 1808)


4.

.Plum Pudding model of atom was suggested by

Ans:-J.J Thomson


5.

.The term 'molecule' was introduced by

Ans:-Avagrado


6.

. The sum of number of protons and neutrons present in the nucleus of an atom is

Ans:-Mass Number


7.

. The number of protons present in a nucleus of an atom is

Ans:-Atomic Nunber


8.

. The fundamental particle of matter or nature

Ans:-Electron


9.

.The heaviest sub-atomic particle is

Ans:-Neutron


10.

.The duel nature of electron was proposed by

Ans:-Victer de Broglie


11.

.The duel nature of electron was experimentally provided by

Ans:-I.H Germer


12.

.The smallest atom known is

Ans:-Helium


13.

.The simplest atom known is

Ans:-Hydrogen


14.

.The most abundant element in the universe is

Ans:-Hydrogen


15.

.The different types of atoms of the same element having same atomic number and different mass numbers are called

Ans:-Isotopes


16.

.Protium, deuterium and tritium are the isotopes of -------

Ans:-Hydrogen


17.

. Protium has no ------

Ans:-Neutron


18.

.Deuterium has ------ neutrons

Ans:-One


19.

.Tritium has ----- neutrons

Ans:-Two


20.

.Isotopes differ in the number of --------

Ans:-Neutrons


21.

.The atoms of different elements having same mass number and different atomic numbers is called

Ans:-Isobars


22.

.The atoms of different elements having different atomic numbers , and mass numbers but having same number of neutrons

Ans:-Isotones


23.

. The different types of the atoms of the same element having different radio activity constant is called

Ans:-Nuclear Isomers


24.

. The term 'isotope' was introduced by

Ans:-Soddy


25.

. Different forms of the same element with different physical appearance is called

Ans:-Allotropes


26.

.The most complex atom available from earth is

Ans:-Uranium-238


27.

.The combining capacity of one atom to another

Ans:-Valency


28.

.Noble gases have ------ valency

Ans:-Zero


29.

Hydrogen shows --------- valency

Ans:-Univalency


30.

Sodium and Potassium show --------- valency

Ans:-Univalency


31.

The common valency of carbon is ---------

Ans:-Four


32.

The largest number of compounds are produced by -----------

Ans:-Hydrogen ( second- carbon)


33.

Cathode rays are discovered by

Ans:-Julius Plucker


34.

Anode rays are discovered by

Ans:-Goldstein


35.

Neutrons was discovered by

Ans:-James Chadwick


36.

----------rays are used in Television

Ans:-Cathode rays


37.

The most valid atomic theory is

Ans:-Wave mechanical model of atom


38.

Wave mechanical model of atom was suggested by

Ans:-Max Planck


39.

An instrument that analysis the wavelength of emitted radiations is

Ans:-Spectrometer


40.

The radioactive liquid element is

Ans:-Francium


41.

The radioactive gaseous element is

Ans:-Radon


42.

The atomic number is first calculated by

Ans:-Moseley


43.

The densest element

Ans:-Osmium


44.

The lightest element

Ans:-Hydrogen


45.

The lightest metal

Ans:-Lithium


46.

The intensity of radiation is measured by

Ans:-Actinometer


47.

Sodium is discovered by

Ans:- Sir Humphry Davy


48.

Barium, boron, calcium ,magnesium and potassium are discovered by

Ans:-Sir Humphry Davy


49.

Hydrogen is discovered by

Ans:-Henry Cavedish


50.

Nitrogen is discovered by

Ans:-Daniel Rutherford


51.

The common refrigerents are

Ans:-Amonia and Freon


52.

Non stick Kitchen Vessels are coated with

Ans:-Teflon


53.

Teflon is chemically

Ans:-Tetra flouroethylene


54.

Photographic films are coated with --------

Ans:-Silver Bromide


55.

Seeding of cloud is done by using

Ans:-Silver Iodine


56.

Phosphine has the smell of

Ans:-Rother Fish


57.

Bleeching Powder is chemically

Ans:-Calcium Chloride HypoChlorite


58.

Bleeching Powder is a -------

Ans:-Mixed Salt


59.

Egg shell, Marble and Limestone contain

Ans:-Calcium Carbonate


60.

------ effect is created by Carbodioxide, Methane and water vapur

Ans:-Green House


61.

Solid Carbon dioxide is called

Ans:-Dry Ice


62.

Rat poison is chemically ---------

Ans:-Zinc Phosphide


63.

Benzyl Chloride is used as -----------

Ans:-Tear Gas


64.

Laughing Gas is --------

Ans:-Nitrous Oxide


65.

-------- is used to coat on mirror

Ans:-Tin Amalgum


66.

Paper is chemically --------

Ans:-Cellulose


67.

The most abundant Carbohydrate present in nature is ----------

Ans:-Cellulose


68.

Cellulose is not absorbed by the human body, due to the absence of ------ in body

Ans:-Cellulose


69.

Rust is chemically

Ans:-Hydrated Ferric Oxide


70.

Freezing Mixture contains ---------

Ans:-Calcium Chloride & Sodium Chloride