Q.1:- The formula of Haematite is ?
Q.2:- Iron is rendered passive by treatment with ?
Q.3:- Parke’s process is used ?
- To extract Cu using CuFeS2
- To extract Ag from Argentiferous Lead
- To extract Ag by forming Amalgam
- To extract Ag using NaCN
Q.4:- Which of the following is highly corrosive salt ?
Q.5:- In the ordinary fire extinguisher, Carbon Dioxide is generated by the reaction of ? [BSSC Exams 2015]
- Sodium Carbonate and Dilute HCL
- Sodium Bicarbonate and Dilute H2SO4
- Limestone and Dilute H2SO4
- Marble powder and Dilute HCl
Q.6:- Number of water molecules present in Mohr’s salt is ?
Q.7:- Which gas is evolved when H2O2 reacts with Chlorine ?
- None of the above
Q.8:- An aqueous solution of Borax is ?
Q.9:- Alum is water purifier because it ?
- Gives taste
- Softens hard water
- Coagulates the impurities
- Destroys the pathogenic bacteria
Q.10:- Boron halides behave as Lewis base, because of their ?
- Electron deficient nature
- Acidic nature
- Ionic nature
- Covalent nature
Q.11:- The reducing agent in thermite process is ?
Q.12:- The Ultraviolet Rays can be checked by ?
- Flint Glass
- Crooke’s Glass
- Soda Glass
- Pyrex Glass
Q.13:- Which of the following is an important constituent of transistors ?
Q.14:- Percentage of Lead in Lead pencil is ?
Q.15:- Aqua-Regia is a mixture of ?
- 3HCl + HNO3
- H3PO4 + H2SO4
- 3HNO3 + HCl
- HCl + CH3COOH
Q.16:- Red Phosphorous is less reactive than yellow phosphorous because ?
- It is red in colour
- It is highly polymerised
- It is insoluble in C2H5OH
- It is hard
Q.17:- Stannous fluoride is formed by ?
- Sn + HF
- SnO2 + HF
- Sn + F
- SnO + HF
Q.18:- Elements showing maximum inert pair effect is ?
Q.19:- The mixture of White and Red Phosphorous can be separated by using ?
Q.20:- Sea weeds are important source of ?
Q.21:- Chlorine is manufactured by ?
- Birkeland and Eyde Process
- Deacon’s Process
- Bosch Process
- Solvay’s Process
Q.22:- When water is electrolysed, then which of the following is formed ?
- Both (B) and (C)
Q.23:- The non-metal found in the liquid state is ?
Q.24:- The mixture of concentrated HCl and HNO3 made in 3:1 ratio contains ?
Q.25:- Which of the following noble gases has the largest Vander Waal’s radius ?