Questions
Which of the following is a non-metal that remains liquid at ordinary temperature?
- Bromine
- Phosphorus
- Argon
- Helium
Gold is soluble in
- HCI
- HF
- HBr
- Aqua regia
Copper does not react with dilute HCl but reacts in the presence of air or oxygen because
- copper is ranked lower than hydrogen in the activity series
- hydrochloric acid is not an oxidising agent
- air or oxygen oxidises the copper metal to copper (+ 2) ion
- all of these
Coloured glass for goggles contains
- ferrous oxide
- nickel oxide
- ferric oxide
- lanthanide oxide
The filament of an electric bulb is made up of
- tungsten
- nichrome
- iron
- carbon
Match List I with List II and select the correct answer from the codes given below.
List I List III
I. Lead (A) Haematite
II. Iron (B) Biotite
III. Mica (C) Galena
IV. Aluminium (D) Bauxite
- I - C, II - A, III - B, IV - D
- I - C, II - D, III - A, IV - B
- I - B, II - A, III - C, IV - D
- I - D, II - C, III - B, IV - A
Solder metal is an alloy of
- tin and zinc
- zinc and lead
- zinc and copper
- tin and lead
The purest form of iron is
- wrought iron
- steel
- pig iron
- cast iron
Matrix is defined as
- unwanted foreign material present in the ore
- flux added to remove the unwanted impurities from ore
- slag formed as a result of the reaction of flux with gangue
- material used in the reduction of metal oxide to metal
The flux used in the blast furnace to remove the unwanted impurities is
- basic
- acidic
- neutral
- amphoteric