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A metal surface is exposed to solar radiations:
(1) The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
(2) The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation
(3) The emitted electrons have energy equal to energy of photos of incident light
(4) The emitted electrons have zero energy
Ans: The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
The surface area of the Pacific Ocean is 166000000000000m 2 . Write this quantity in scientific notation. To write the amount in scientific notation move the decimal point to after
Structure of Aldehydes and Ketones Carbonyl carbon atom is connected to three atoms by sigma bonds. As these bonds use Sp 2 -orbitals, they found in the same plane and are 120°
chemical reaction needed to lift a balloon
When an electron revolves in a stationary orbit then: (1) It absorbs energy (2) It emits radiation (3) Its energy remains constant (4 )It gains kinetic energy Ans:
Describe the following electrochemical methods in terms of their working principles instrumentation and applications i. Potentiometry ii. polarography iii. Conductometry
The nitride ion in lithium nitride is composed of: (1) 7 protons + 10 electrons (2) 10 protons + 10 electrons (3) 7 protons + 7 protons (4) 10 protons + 7 electr
which is the main postulate of bohr''s model of atom
CH3CH=CH-CHO
Introduction Cluster and ring compounds arise in many areas of chemistry. Rings are most often built by nonmetallic elements with directional covalent bonding. They ad
Amongst the following covalent bonding is found in: (1) Sodium chloride (2) Magnesium chloride (3) Water (4) Brass Ans: Water
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