In melting of iron, which of the following reactions takes place in Bladt Furnace at 400°C- 600°C________?

A. Cao+ sio2——> casio3
B. 2fes+3o2——–> 2fe+ so2
C. Fesio3———> fesio3
D. Fe2o3+ 3co——–> 2fe+ 3co2

Gypsum is______?

A. Caso4
B. Caso4.1/2h2o
C. Caso4,2h2o
D. Caso4.3h2o

Basicity of orthophosphoric acid is________?

A. 2
B. 3
C. 4
D. 5

Ce58 is a member of__________?

A. S-block
B. P-block
C. D-block
D. F-block

Electronic Configuration of Calcium (Ca) atom may be written as________?

A. Ne, 4p2
B. Ar, 4s2
C. Ne, 4s2
D. Kr,4p2

A 10 volume solution of H2O2 means_______?

A. 10 grams of h2o2 solution liberate 10 ml of o2 at sto
B. 10 gram equivalents of h2o2 liberates 10 ml of o2 at stp
C. 10 litres of h2o2 liberates 19 ml of o2 at stp
D. 1ml of solution of h2o2 liberates 10 ml of o2 at stp

The volume strength of 1.5 N H2O2 solution is_______?

A. 4.8
B. 5.2
C. 8.8
D. 8.4

The structure of H2O2 is_______?

A. Planar
B. Non- polar
C. Spherical
D. Linear

Which of the following element has the maximum electron affinity_____?

A. Cl
B. Br
C. I
D. F

The type of hybridisation of boron in diborane is______?

A. Sp- hybridisation
B. Sp2- hybridisation
C. Sp3- hybridisation
D. Sp3d2- hybridisation