1401. Nitrogen is an essential constituent of _________.

A. Animals
B. Plants
C. Soils
D. All of these *

1402. Matter is made up of small particles called ________.

A. Atoms *
B. Electrons
C. Ions
D. Molecules

1403. Which of the following two elements are present in the largest number of compounds ?

A. Carbon and Hydrogen *
B. Carbon and Nitrogen
C. Carbon and Oxygen
D. Oxygen and Hydrogen

1404. Which of the following metals has the lowest metling point?

A. Lead
B. Lithium
C. Potassium *
D. Sodium

1405. Which of the following has the lowest ionisation potential?

A. Bromine
B. Chlorine
C. Fluorine
D. Iodine *

1406. All of the following are area of copper except?

A. Cuprite
B. Cinnabar *
C. Copper Pyrites
D. Malachite

1407. Most reactive element among the following is ______.

A. Fluorine *
B. Iodine
C. Nitrogen
D. Oxygen

1408. The process which brings about chemical decomposition of a substance by water is called ______.

A. Hydrogenation
B. Hypotrophy
C. Hybridisation
D. Hydrolysis *

1409. How many kinds of rays-do radioactive elements emit?

A. Two
B. Three *
C. Four
D. One

1410. Liver, Milk, Egg Yolk, fish liver oil are teh source of Vitamin?

A. A
B. B
C. C
D. D *

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