Metals and their compounds

131.what metals are in brass
 
A. iron and copper
 
B. zinc and iron
 
C. copper and zinc
 
D. nickel and zinc
 
Option”C” is correct
132.Consider the following statements – 1. Baking soda is used in fire extinguishers. 2. Quick lime is used in the production of glass. 3. Gypsum is used in the production of plaster of paris. Which of the above statements is/are correct?
 
A. 1 and 2
 
B. 2 and 3
 
C. only 1
 
D. 1, 2 and 3
 
Option”D” is correct
133.Consider the following statements 1. Anhydrous sodium carbonate is commonly known as baking soda. 2. Baking soda is used in fire extinguishers. 3. Bleaching powder is produced at the Hessenclaver plant. Which of the above statements is/are correct?
 
A. 1,2 and 3
 
B. 2 and 3
 
C. only 3
 
D. 1 and 2
 
Option”C” is correct
134.The ‘slots’ used to connect electronic circuits contain
 
A. lead and tin
 
B. tin and iron
 
C. copper and lead
 
D. lead and aluminum
 
Option”A” is correct
135.Metals are good conductors because
 
A. they have free electrons
 
B. their molecules stick together
 
C. their molecules collide freely
 
D. their page is reflective
 
Option”A” is correct
136.Which of the following compounds is commonly used in mouthwashes and toothpastes?
 
A. icing
 
B. saltpeter
 
C. hydrogen peroxide
 
D. Sodium chloride
 
Option”A” is correct
137.Which of the following is liquid at room temperature
 
A. lithium
 
B. sodium
 
C. francium
 
D. Cerium
 
Option”C” is correct
138.Which alloy is used to make magnets
 
A. duralumin
 
B. Stainless Steel
 
C. Elkino
 
D. magnalium
 
Option”C” is correct
139.Which of the following is not a component of chlorophyll
 
A. hydrogen
 
B. magnesium
 
C. Carbon
 
D. calcium
 
Option”D” is correct
140.What gives glass its deep blue color?
 
A. cobalt oxide
 
B. cupric oxide
 
C. ferrous oxide
 
D. nickel oxide
 
Option”A” is correct