Metals and Their Compounds

Q151. Gold is mainly extracted from which ore?

1. ASylvanite
2. Bcalaverite
3. CIn both of the above
4. Dnone of these

Q152. Gold dissolves in which of the following acids?

1. Aconcentrated sulfuric acid
2. Bconcentrated nitric acid
3. Cglacial acetic acid
4. Dacid reagent

Q153. What is added to gold to make it hard?

1. AIron
2. BNickel
3. Ccopper
4. Dlead

Q154. On which products is the Hallmark symbol affixed?

1. AFood ingredient
2. Bgold jewellery
3. CPetroleum products
4. DEnvironment friendly products

Q155. Known as Fool's Gold

Q156. It is pure Mona (Pure Gold).

1. A18 carats
2. B20 carats
3. C22 carats
4. D24 carat

Q157. What is the percentage of pure gold in 18 cut alloy?

1. A0.79
2. B0.75
3. C0.5
4. D1

Q158. 'Sinwar' (HgS) is the ore of which metal?

1. Asilver
2. BMercury
3. CAluminum
4. DSleep

Q159. Who extracts mercury?

1. AFrom galena
2. Bfrom bauxite
3. CCinnabar
4. DFrom pyrolusite

Q160. What causes Minamata disease?

1. AMercury
2. BCC
3. CCadmium
4. Dzinc

Q161. Known as Quick Silver

1. Aaluminum
2. BMercury
3. CLatinum
4. DPalladium

Q162. Which of the following are metals?

1. ACa
2. BHg
3. CN
4. DMn

Q163. The alloy containing ............ is called 'Amalgam'.

1. AMercury
2. BNickel
3. Csilver
4. DCobalt

Q164. Which of the following alloys is called different?

1. Azinc copper
2. Bcopper tin
3. Cmercury zinc
4. Dlead zinc

Q165. An amalgam always has a plate

1. AIron
2. BCopper
3. CZinc
4. DMercury

Q166. Mercury is commonly used in thermometers because of its properties.

1. Ahigh density
2. Blow liquidity
3. CHigh operating power
4. Dhigh specific heat

Q167. Which gas is filled in a normal tube light (fluorescent bulb)?

1. ASodium vapor with argon
2. BOn sodium with neon
3. CMercury vapor with argon
4. DMercury vapor with neon

Q168. The most commonly used material in fluorescent tubes is

1. Asodium oxide and argon
2. Bsodium vapor and neon
3. CMercury paper and organ
4. DMercury oxide and argon

Q169. The chemical formula of 'Sindoor' (Vermillion) is

1. AHgS
2. BHgo
3. CHg²Cl²
4. DHgCl²

Q170. The chemical formula of 'Cinewar' is

1. AHgS
2. BPbS
3. CCuo
4. DMgSO⁴

Q171. The chemical formula of calomel is

1. AHgCl₂
2. BHg² Cl²
3. CHg
4. DHgso

Q172. The chemical formula of the chemical used as 'Makara Dhwaj' in medicines is

1. AHgCl²
2. BHg²Cl²
3. CHg
4. DHgo

Q173. The chemical formula of the chemical used as 'Makara Dhwaj' in medicines is

1. AHgCl²
2. BHg²Cl₂
3. CHg
4. DHgso⁴

Q174. From a chemical point of view, vermilion is

1. Acalcium carbonate
2. Bpotassium nitrate
3. Cpotassium sulfide
4. DMercury || Sulphide

Q175. In which metal vessel is mercury kept?

1. ASilber
2. Blead
3. CIron
4. Dzinc