Skip to main content

Chemistry - General Questions


1. The nucleus of an atom consists of


A. electrons and neutrons

B. electrons and protons

C. protons and neutrons

D. All of the above



2. The most electronegative element among the following is


A. sodium

B. bromine

C. fluorine

D. oxygen



3. The metal used to recover copper from a solution of copper sulphate is


A. Na

B. Ag

C. Hg

D. Fe



4. The metallurgical process in which a metal is obtained in a fused state is called


A. smelting

B. roasting

C. calcinations

D. froth floatation



5. The most commonly used bleaching agent is


A. alcohol

B. carbon dioxide

C. chlorine

D. sodium chlorine



6. The most malleable metal is


A. platinum

B. silver

C. iron

D. gold



7. The most abundant rare gas in the atmosphere is


A. He

B. Ne

C. Ar

D. Xe



8. The metal that is used as a catalyst in the hydrogenation of oils is


A. Ni

B. Pb

C. Cu

D. Pt



9. The heat required to raise the temperature of body by 1 K is called


A. specific heat

B. thermal capacity

C. water equivalent

D. None of the above



10. The nucleus of a hydrogen atom consists of


A. 1 proton only

B. 1 proton + 2 neutron

C. 1 neutron only

D. 1 electron only



Answers

1. C

2. C

3. D

4. A 

5. C 

6. D

7. C

8. A

9. B

10. A

Labels:

Comments

Post a Comment

Popular posts from this blog

Physics - Scalers and Vectors

  Introduction to Vectors and Scalars We come into contact with many physical quantities in the natural world on a daily basis. For example, things like time, mass, weight, force, and electric charge, are physical quantities with which we are all familiar. We know that time passes and physical objects have mass. Things have weight due to gravity. We exert forces when we open doors, walk along the street and kick balls. We experience electric charge directly through static shocks in winter and through using anything which runs on electricity. There are many physical quantities in nature, and we can divide them up into two broad groups called vectors and scalars. Scalars and Vectors Scalars are physical quantities which have only a number value or a size (magnitude). A scalar tells you how much of something there is. Definition: Scalar A scalar is a physical quantity that has only a magnitude (size). For example, a person buys a tub of margarine which is labelled with a mass of 500g....
Post a Comment
»»»

Mathematics - Numbers

  Numbers There are different types of numbers in the world. Each number is different from another, yet they may share some common characteristics. To help themselves keep track of and understand the similarities and differences between numbers, mathematicians have developed a grouping system that categorizes and describes numbers based on their characteristics. Some of the most common groups in the system are: Natural numbers Whole numbers Integers Rationals Real numbers Prime numbers Natural numbers The natural numbers are all the numbers that you learn when you're a baby, like 1, 2, 3, 4, 5, 6 and on and on. The natural numbers are also sometimes called the counting numbers because they're the first numbers you learn how to count. Zero is not a natural number. Whole Numbers The whole numbers are the natural numbers and zero. i.e 0, 1,2,3,4,5..... Integers Integers are a special group or category of numbers that: Consist of the set of numbers: {. . .-4, -3, -2, -1, 0, 1, 2, 3...
Post a Comment
»»»

Chemistry - Separation Techniques

 A separation process or technique is a method that converts a mixture or solution of chemical substances into two or more distinct product mixtures. At least one of results of the separation is enriched in one or more of the source mixture’s constituents. In some cases, a separation may fully divide the mixture into pure constituents. Separations exploit differences in chemical properties or physical properties (such as size, shape, mass, density, or chemical affinity) between the constituents of a mixture. Processes and techniques are often classified according to the particular differences they use to achieve separation. If no single difference can be used to accomplish a desired separation, multiple operations can often be combined to achieve the desired end. With a few exceptions, elements or compounds exist in nature in an impure state. Often these raw materials must go through a separation before they can be put to productive use, making separation techniques essential for ...
Post a Comment
»»»