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 *