121 Q) Which one of the following oxides is the most abundant in Earth crust?
(a) Na2O
(b) CaO
(c) MgO
(d) SiO2
122 Q) "Natural Opal which is commonly used as gemstones in many countries is mainly
"
(a)a hydrated calcium compound
(b)a magnesium compound
(c) a sulphur compound
(d)a hydrated silica
123 Q) Sacrificial anode protects Iron or ships, underground pipelines etc. from rusting, a process known as cathodic protection. Which one of the following metals cannot be used as a sacrificial anode?
(a) Tin
(b) Aluminium
(c) Zinc
(d) Magnesium
124 Q) Which one among the following chemicals can be used to clean the surface of gold ornaments?
(a) Concentrated sulphuric acid
(b) Concentrated sodium hydroxide
(c) Aqua-regia
(d) Sodium thiosulphate solution
125 Q) Which one among the following statements is correct?
(a) All bases are alkalis
(b) None of the basis is alkali
(c) There are no more bases except the alkalis
(d) All alkalis are bases but all bases are not alkalis
126 Q) "Which chemical was an important symbol
in our struggle for freedom?."
(a) Glucose
(b)Fertilizer
(c) Medicine
(d)Sodium chloride
127 Q) Which one of the following is the hardest alkali metal?
(a) Li
(b) K
(c) Na
(d) Cs
128 Q) Scuba divers are at high risk due to high concentration of dissolved gases while breathing air at high pressure under water. The tanks used by Scuba divers are filled with
(a) air diluted with helium
(b) 02
(c) N2
(d) a mixture of nitrogen and helium
129 Q) "Carbonated beverages such as soft drinks and soda water contains mainly
"
(a) carbon dioxide
(b) calcium carbonate
(c) calcium hydroxide
(d) potassium carbonate
130 Q) "Consider the following statements
I.The Carat is a unit of purity for gold alloys.
II.18-Carat gold is 24 parts gold and 6 parts another metal.
Which of the statements given above is/are correct?"
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
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