Duralumin consists of aluminium, copper, ?
zinc and gold
lead and maganese
nickle and silver
manganese and magnesium
Correct answer is D
No explanation has been provided for this answer.
Which of the following is NOT used as a raw material in the Solvay process?
Ammonia
Sodium chloride
Calcium trioxocarbonate (IV)
Sodium trioxocarbonate (IV)
Correct answer is D
No explanation has been provided for this answer.
Sodium hydroxide solution can be conveniently stored in a container made of?
lead
zinc
aluminium
copper
Correct answer is D
No explanation has been provided for this answer.
Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?
nitrate
carbonate
chloride
sulphide
Correct answer is B
No explanation has been provided for this answer.
Safety matches contain sulphur and the following except?
sodium chloride
potassium trioxonitrate (V)
charcoal
phosphorus sulphide
Correct answer is A
Modern safety matches usually have antimony sulfide, oxidizing agents such as potassium chlorate, and sulfur or charcoal in the heads, and red phosphorus in the striking surface.