11. An Oxide of metal contains 60% of the metal. What will be the equivalent weight of the metal ?
A. 12
B. 40
C. 24
D. 48
Answer : Option A
Explanation :
mass of metal = 60 g
\(\therefore \) mass of oxygen = 40 g
mass of oxygen = mass of metal
40 g = 60g
8 g = (?)
= \(\frac{8\times 60}{40}\)
= 12
12. A container is filled with 2L of water. What will be the volume of water in \(m^{3}\) ?
A. \(2\times 10^{3}\)
B. \(1\times 10^{3}\)
C. \(2\times 10^{-3}\)
D. \(1\times 10^{-3}\)
Answer : Option C
13. The mass of carbon -12 atom considered in the definition of a mole is
14. The drug which is used for treating AIDS victims is
15. Chose the incorrect statement .
A. The constituents of a compound cannot be separated into simpler substances by physical methods.
B. An element is consists of only one type of particles and these particles may be atoms or molecules.
C. The properties of a compound are same as its constituent elements.
D. Atoms of different elements are different in nature.
Answer : Option C
16. Which of the following is a pair of physical and chemical property respectively of a substance ?
A. Acidity & combustibility
B. Colour & density
C. Basicity & colour
D. Density & acidity.
Answer : Option D
17. What is the symbol of S.I. unit for the amount of substance ?
18. What is the symbol of a multiple '\(10^{9}\)' ?
19. Find the correct relation.
A. \(^{\circ}F=\frac{9}{5}(^{\circ}C)-32\)
B. \(^{\circ}C=\frac{5}{9}(^{\circ}C-32)\)
C. Both A and B
D. Neither A nor B
Answer : Option D
20. In chemistry a number is represented in the form \(N\times 10^{n}\) . This method of expressing the number is called scientific notation. What is the value of ‘N’ here.