Chemistry Solved Questions and Answers Set 6

Q.1:- Which of the following electromagnetic wave has the longest wave length ?

1. Infrared Rays
2. Gamma Rays
3. Light Rays
4. Ultra Violet Rays

Q.2:- Whose experiment proved that the speed of light was always the same ?

1. James Clark Maxwell
2. Michelson and Morley
3. Miller and Stanley
4. Werner Heisenberg

Q.3:- The Alpha particles carries two positive charges. Its mass is very nearly equal to that of ?

1. Two protons
2. An atom of Helium
3. Sum of masses of two positron and two neutrons
4. Two positron as each positron carries a single positive charge

Q.4:- An aqueous solution of Copper Sulphate is acidic in nature because the salt undergoes ?

1. Dialysis
2. Electrolysis
3. Hydrolysis
4. Photolysis

Q.5:- The purpose of smelting an ore to ?

1. Reduce it
2. Oxide it
3. Obtain an alloy
4. Separate volatile impurities

Q.6:- The formation of colloid from suspension is ?

1. Peptisation
2. Condensation
3. Sedimentation
4. None of these

Q.7:- Milk is an example of ?

1. Oil in water emulsion
2. Water in oil emulsion
3. Fat in oil emulsion
4. Fat in water emulsion

Q.8:- A colloid always has ?

1. Two phases
2. True solution
3. Three phases
4. Solute particles in water

Q.9:- The atomic orbital is ?

1. The circular path of the electron
2. Elliptical shaped orbit
3. Three dimensional field around nucleus
4. The region in which there is maximum probability of finding electron

Q.10:- The three basic components of an atom are ?

1. Protons, Neutrons and Ions
2. Protons, Neutrons and Electrons
3. Protium, Deuterium and Tritium
4. Protons, Neutrons and Ions

Q.11:- In a given atom, no two electrons can have the same value for all the four quantum number. This is called ?

1. Hund’s Rule
2. Pauli’s exclusion principle
3. Uncertainty principle
4. Aufbau’s principle

Q.12:- The concept of dual nature of radiation was proposed by ?

1. Max Planck
2. De-Broglie
3. Heisenberg
4. Pauling

Q.13:- The total number of orbitals in principal shell is ?

1. n²
2. n
3. 2n²
4. 3n²

Q.14:- The activity or radioisotope change with ?

1. Temperature
2. Pressure
3. Chemical Environment
4. None of these

Q.15:- Species containing same number of electrons are called ?

1. Isotopes
2. Isobars
3. Isoelectronic
4. Isotones

Q.16:- Wavelength of which of the following colours of the visible spectrum of light are maximally absorbed by green plants ?

1. Green and Yellow
2. Red and Blue
3. Green and Red
4. Blue and Yellow

Q.17:- The photoelectric effect is described as the ejection of electrons from the surface of a metal when ?

1. It is heated
2. It is placed in strong electric field
3. Electrons of suitable velocity impinge on it
4. Light of suitable wavelength falls on it

Q.18:- Meson was discovered by ?

1. Powell
2. Seaburg
3. Anderson
4. Yukawa

Q.19:- Which one is not the isotopes of Hydrogen ?

1. Protium
2. Eritium
3. Deuterium
4. Tritium

Q.20:- A redox reaction is ?

1. Proton transfer reaction
2. Ion combination reaction
3. A reaction is solution
4. Electron transfer reaction

Q.21:- Starch Iodide paper is used to test for the presence of ?

1. Iodine
2. Iodide Iron
3. Oxidising Agent
4. Reducing Agent

Q.22:- An acid is a substance which ?

1. Donates a proton
2. Accepts an electron
3. Give H+ in water
4. All

Q.23:- Uric acid is present in ?

1. Soda Water
2. Rancid Butter
3. Sour Milk
4. Urine of Mammals

Q.24:- A gas expands isothermally and reversibly. The work done by the gas is ?

1. Zero
2. Maximum
3. Minimum
4. Cannot be determined

Q.25:- The biocatalysts are ?

1. Enzymes
2. Minerals
3. Plants
4. All Proteins