Q.1:- The process of converting Hydrate Al2O3 into anhydrous aluminium is known as ?
Q.2:- The salt which is least likely to be found in minerals is ?
Q.3:- Silver metal is obtained by ?
- Parke’s process
- Froth floatation process
- Carbon reduction process
- Magnetic separation
Q.4:- Salts of which of the following elements provide colours to fireworks ? [IAS Exams 2004]
- Zinc and Sulphur
- Potassium and Mercury
- Strontium and Barium
- Chromium and Nickel
Q.5:- Calcination is the process of heating the ore ?
- In a blast furnace
- In absence of air
- In presence of air
- None of the above
Q.6:- Gypsum is used for improvement of ? [SSC Exam 2013]
- Acidic Soils
- Alkaline Soils
- Saline Soils
Q.7:- Beryl is an important mineral of ?
Q.8:- Lunar caustic is ?
Q.9:- Which is most active metal among the following ?
Q.10:- Important ore of Mg is ?
Q.11:- Gold dissolves in aqua regia to produce ?
Q.12:- The paramagnetic character of the metals is due to ?
- Completely filled orbitals
- Unpaired electrons
- Variable valency
- Low melting and boiling point
Q.13:- Spathic ore is ?
Q.14:- Purest form of Iron is ?
- White cast Iron
- Grey cast Iron
- Wrought Iron
Q.15:- Which one of the following elements is an example of noble gas ? [SSC Exam 2014]
Q.16:- Water softening by Clarke’s process uses ?
- Potash Alum
- Calcium Bicarbonate
- Calcium Hydroxide
- Sodium Bicarbonate
Q.17:- Lead pencil contains ?
Q.18:- The chemical used as a fixer / developer in photography is ? [NDA Exam 2015]
- Sodium Sulphate
- Sodium Sulphide
- Sodium Thiosulphate
- Sodium Sulphite
Q.19:- Emery consists of impure ?
Q.20:- The process of slow and homogeneous cooling of glass is called ?
- Etching of glass
- Annealing of glass
- Enamelling of glass
- Denitrification of glass
Q.21:- The compound used as refrigerant is ?
Q.22:- Which of the following show electrical conductance ?
Q.23:- Super Phosphate of lime contains ?
- H3PO4 + Ca3(PO4)2
Q.24:- Ozone is an _____ of Oxygen ?
Q.25:- SO2 is not a ?
- Basic Oxide
- Bleaching Agent
- Reducing Agent