Objective

Question-2. Elements which have properties of both metals and non-metals are called?

Ans- metallurgy

Question-3. Which is placed on the left and right side of the periodic table?

Ans- on the left side → to metals

on the right → non-metals and inert gases

Question-4. Which metal is in liquid state at room temperature?

Ans- mercury (mercury)

Question-5. Which metal is soft and can be easily cut with a knife?

Ans- Lithium, Sodium, Potassium

Question-6. A thin sheet can be made by beating a metal, what is this property of metals called?

Ans- traumatic

Question-7. Which metal is the most malleable?

Ans- gold and silver

Question-8. What is the property of pulling metals in the form of thin wire called?

Ans- tensile

Question-9. Which metal is the most ductile?

Ans- Gold

Question-10. Who is the best conductor of heat and electricity?

Ans- silver and copper

Question-11. Lowest conductor of heat?

Ans- Lead (Lead) and Mercury (Mercury)

Question-12. Electrical conductivity in metals is due to

Ans- due to free electrons

Question-13. What happens to all metals, electricity and heat?

Ans- Metals → Conductors

Non-metals → Insulators

Question-14. Which is such a non-metal, which despite being a non-metal, is a good conductor of electricity?

Ans- graphite

Question-15. What happens to rubber, glass and plastic electricity?

Ans- Insulator

Question-16. How do metals have melting points?

Ans- high

Question-17. What are the melting points of the metals lithium, sodium, and potassium?

Ans- low

Question-18. Which is the heaviest metal and which is the lightest metal?

Ans- Heavy Metals → Uranium

Light Metal → Lithium

Question-19. What is the state of bromine?

Ans- fluid

Question-20. How many allotropes of carbon are there?

Ans- two (diamond and graphite)

Question-21. Which is the hardest of natural substances?

Ans- Diamond

Question-22. What is graphite like?

Ans- soft and smooth

Question-23. There is no special luster in non-metals, but what is the element which, despite being non-metal, has luster in it?

Ans- Iodine

Question-24. What is Boron and Silicon?

Ans- metallurgy

Question-25. What does a metal form when it reacts with oxygen?

Ans- metal oxide

Question-26. Which method is suitable to prevent rusting of iron frying pan?

Ans- (d) All

Question-27. Are metal oxides acidic or basic?

Ans- alkaline (bhasmic)

Question-28. Which metal automatically catches fire when left open in the air?

Ans- Lithium, Sodium and Potassium

Question-29. Where are lithium, sodium and potassium stored to be stored?

Ans- dipped in kerosene oil

Question-30. Metal oxides are present in water?

Ans- insoluble

Question-31. Metals whose oxides are both acidic and basic in nature are called?

Ans- amphoteric oxide

Question-32. What do amphoteric oxides form when they react with acids and bases?

Ans- salt and water

Question-33. What is the process of forming a thick oxide layer on aluminum called?

Ans- anodization

Question-34. Metals that react with cold or hot water form what?

Ans- metal hydroxide and hydrogen gas

Question-35. What do metals that react with steam form?

Ans- metal oxides and hydrogen gas

Question-36. Which metal reacts faster with cold water?

Ans- potassium and sodium

Question-37. Which metal reacts slowly with cold water?

Ans- Calcium (Ca)

Question-38. Which metal does not react with cold water but reacts with hot water?

Ans- Magnesium (Mg)

Question-39. Which metal does not react with both cold and hot water, but reacts with steam?

Ans- Aluminum, Iron and Zinc

Question-40. Which metal does not react with cold water, hot water and steam?

Ans- Gold, Silver, Copper, Platinum and Lead

Question-41. What does a metal react with an acid to form?

Ans- salt and hydrogen gas

Question-42. Which metal reacts faster with acids?

Ans- magnesium

Question-43. Iron is made from copper?

Ans- more reactive

Question-44. In what order are the reactivity series of metals arranged?

Ans- in descending order

Question-45. Most reactive metal.

Ans- lithium

Question-46. Least reactive metal.

Ans- Gold

Question-47. In which state are the most reactive metals found in nature?

Ans- in a combined state

Question-48. In which state are the less reactive metals found in nature?

Ans- in a free state

Question-49. What do metals make by giving up electrons?

Ans- electropositive ion

Question-50. What do nonmetals make by gaining electrons?

Ans- electronegative ion

Question-51. What do nonmetals react with oxygen to form?

Ans- acidic oxide

Question-52. What do the oxides of non-metals form when dissolved in water?

Ans- acid

Question-53. Name the metal which is found in free state in nature.

Ans- gold, silver, copper

Question-54. Which is a noble gas?

Ans- Helium (He), Neon (Ne) and Argon (Ar)

Question-55. What are the outermost shell electrons of noble gases?

Ans- Full

Question-56. Which do not take part in chemical reaction?

Ans- Noble gases

Question-57. What is a compound formed by the transfer of electrons from a metal to a non-metal called?

Ans- Ionic Compounds

Question-58. What are ionic compounds?

Ans- solid (hard)

Question-59. How do ionic compounds have melting and boiling points?

Ans- high

Question-60. What are ionic compounds in water?

Ans- soluble

Question-61. What are ionic compounds insoluble in?

Ans- in petrol and kerosene

Question-62. In which state do ionic compounds not conduct electricity?

Ans- in solid state

Question-63. In which state does an ionic compound conduct electricity?

Ans- in aqueous solution or molten state

Question-64. What is the top layer of the earth called?

Ans- Earth's crust

Question-65. What are the naturally occurring elements or compounds in the earth's crust called?

Ans- minerals

Question-66. The minerals from which metals can be obtained easily and at low cost are called what?

Ans- ore

Question-67. How many types of ores are there?

Ans- four

Question-68. Name the metal which is found in combined state in nature?

Ans- Potassium, Sodium, Calcium, Magnesium, Aluminum

Question-69. What is the process of obtaining pure metal from ore called?

Ans- metallurgy

Question-70. What are the impurities present in minerals called?

Ans- Gang (Matrix)

Question-71. What are the impurities present in ores called?

Ans- gang

Question-72. What is done to remove the impurities present in the ores?

Ans- enrichment (concentration)

Question-73. What is the ore of mercury?

Ans- Cinnabar (Hgs)

Question-74. What is an ore of copper?

Ans- Copper Glance (Cu₂s)

Question-75. What is a mixture of iron oxide powder and aluminum powder called?

Ans- thermite

Question-76. What is the main ore of aluminum?

Ans- bauxite

Question-77. Which is the best method to remove impurities (impurities) from metals?

Ans- electrolytic refining method

Question-78. Which is the main ore of iron?

Ans- hematite, magnetite

Question-79. What is the process of coating metals called?

Ans- corrosion

Question-80. What forms iron in the presence of air and moisture?

Ans- Ferric Oxide and Ferric Hydroxide

Question-81. Which metal is most prone to corrosion?

Ans- iron

Question-82. What is the process of coating a thin layer of zinc metal on iron called?

Ans- galvanization

Question-83. What happens when nickel, chromium and carbon combine with iron?

Ans- Stainless Steel

Question-84. What is a homogeneous mixture of two or more metals or metals and non-metals called?

Ans- Alloy

Question-85. When an alloy contains mercury, what is it called?

Ans- amalgam

Question-86. What is the electrical conductivity and melting point of the alloy?

Ans- Less

Question-87. What is the alloy of solder?

Ans- lead and tin

Question-88. Whose alloy is bronze?

Ans- copper and tin

Question-89. Which alloy is brass?

Ans- of copper and zinc

Question-90. Steel is an alloy of what?

Ans- of iron and carbon

Question-91. What kind of metal is Arsenic (As)?

Ans- poisonous

Question-92. What is an alloy of copper and zinc called?

Ans- brass

Question-93. A metal reacts with oxygen to form a compound with a high melting point. This compound is soluble in water. It could be an element.

Ans- Calcium (Ca) and Iron (Fe)

Question-94. Tin is coated instead of zinc on the food containers because-

Ans- Zinc is more reactive than tin.

Question-95. Which is the non-metal with high melting point?

Ans- Diamond

Question-96. What is made of pure metal strip in electroplating?

Ans- cathode

Question-97. Name two classes of elements?

Ans- Metal and non-metal

Question-98. How many elements are nonmetals?

Ans- 22

Question-99. How many elements are metalloids?

Ans- 7

Question-100. Name a non-metal which is solid at normal temperature?

Ans- Carbon (C)

Question-101. What are corrosion reactions?

Ans- oxidation-reduction (oxidation-reduction)

Question-102. Name the non-metal which is used in making vegetable ghee.

Ans- hydrogen

Question-103. What is the general nature of metal oxides?

Ans- alkaline

Question-104. Name the gas displaced by metals during reaction with acids?

Ans- hydrogen gas

Question-105. By which method the metals at the top of the activity series are extracted?

Ans- electrolysis method

Question-106. Name the metal which floats in water?

Ans- Calcium (Ca)

Question-107. Write chemical equations for the reactions that take place when water vapor is passed over red hot iron.

Ans- 3Fe + 4H₂O → Fe₃O₄ + 4He

Question-108. Give an example of a non-metal which is-

Ans-

• It is a liquid at room temperature. → bromine

• Is a good conductor of electricity. → graphite

• Is shiny. → iodine

• very hard → diamond

Question-109. Which gas is evolved when a reactive metal is added to dilute hydrochloric acid?

Ans- hydrogen

Question-111. Name a metal which is found below copper in the reactivity series of metals.

Ans- Silver (Ag)

Question-114. Write the atomic number and electronic configuration of chlorine?

Ans-

Atomic Number → 17

Electronic configuration → 2, 8, 7

Question-115. Name the metal which does not corrode in air?

Ans- gold (Au)

Question-118. How many carats is pure gold?

Ans- 24 carats

Question-120. What do nonmetals react with oxygen to form?

Ans- acidic or neutral oxide

Question-121. Diamond is an allotrope of which element?

Ans- Carbon

Question-122. What does iron combine with oxygen to form?

Ans- iron oxide (ferrous oxide)

Question-123. What is silicone?

Ans- metallurgy

Question-124. What does sodium combine with water to form?

Ans- sodium hydroxide (NaOH) and H₂ (hydrogen gas)

Question-125. What is the atomic number of iron?

Ans- 26

Question-126. Name an inert gas?

Ans- Helium (He)

Question-127. Name two allotropes of carbon?

Ans- diamond and graphite

Question-128. Name an alloy of aluminum metal?

Ans- euralumin

Question-129. What is brass?

Ans- Alloy

Question-130. Why are plants green?

Ans- due to chlorophyll

Question-131. What are the properties of elements by their atomic number?

Ans- periodic function

Question-132. In electrolytic refining, impure metal is made?

Ans- at the anode

Question-133. Which of the following is a metalloid?

Ans- (d) Carbon (C)

Question-134. Which of the following metals has the lowest melting point?

Ans- Sodium (Na)

Question-135. What is the process of forming a thick oxide layer on aluminum called?

Ans- anodization

Question-136. What is the number of electrons in the outermost shell of a sulfur atom?

Ans- 6

Question-137. An iron nail was dipped in the solution taken in a test tube. After half an hour it was observed that the color of the solution had changed. What was the solution in that test tube?

Ans- FeSo₄ (ferrousoxide) solution

Question-138. Which ionic compound has the highest melting and boiling points?

Ans- Sodium Chloride (NaCl)

Question-139. What is the original source of metals?

Ans- Earth's crust

Question-140. Where are salts like sodium chloride, magnesium chloride, etc. found?

Ans- in sea water

Question-141. What is the ore used for?

Ans- for sulfide ore

Question-142. What is the ore used for calcination?

Ans- for carbonate ore

Question-143. What happens to brass and bronze electricity?

Ans- Insulator

Question-144. How long can a wire be drawn from one gram of gold?

Ans- 2 km