Which of the following reactions takes place at higher temperature range ( 900 K-1500K) in blast furnace?

1) $$3Fe_2O_3+ CO \rightarrow 2Fe_3O_4+ CO_2$$
2) $$FeO+ CO \rightarrow Fe + CO_2$$
3) $$Fe_3O_4+ 4CO \rightarrow 3Fe + 4CO_2$$
4) $$Fe_2O_3+ CO \rightarrow 2FeO+CO_2$$

Acetone is soluable in water due to 

1. methyl group 
2. neutral nature 
3. dissociation in water 
4. hydrogen bonding 

In a cubic packed structure of mixed oxides, the lattice is made up of oxide ions, one fifth of tetrahedral voids are occupied by divalent (X⁻) ions, while one-half of the octahedral voids are occupied by trivalent ions (Y⁺³), then the formula of the oxide is:

1) XY₂O₄
2) X₂YO_4???????
3) X₄Y₅O₁₀
4) X₅Y₄O₁₀

Which among the following is not iso-electronic?

1)  O₂²⁺

2)  NO ^-

3)  CN ^-

4)  N₂

Which of the following will form when calcium acetate is distilled?

1)  Formaldehyde

2)  Ethanal

3)  Propanal

4)  Acetone

526.3 mL of 0.5 m HCl is shaken with 0.5 g of activated charcoal and filtered. The concentration of the filtrate is reduced to 0.4 m. The amount of adsorption of HCl per unit mass of adsorbent is 

1) 3
2) 6
3) 8
4) 4

What would you observe if you set up the following electrochemical cell Ag|Agno₃(0.001M)||AgNO₃(1M)|Ag

1) Electrons will flow from left to right, causing an increase in the [Ag+] concentration in the left cell, and a decrease in the [Ag+] concentration in the right cell.
2) Electrons will flow from right to left, causing an increases in the [Ag+]concentration in the left cell and a decrease in the [Ag+] concentration in the right cell.
3) Electrons will flow from left to right, causing a decrease in the [Ag+] concentration in the right cell.
4) Electrons will flow from right to left, causing a decrease in the [Ag+] concentration in the right cell

The sulphate of which metal given below has the highest solubility in water?

1) Ca
2) Ba
3) Sr
4) Mg

Find out the percentage of oxalate in a given sample of an oxalate salt of which when 0.3 g were dissolved in 100 mL of water required 90 mL of N/20 KMnO_4? solution for complete oxidation.

1) 78%

2) 79%

3) 66% 

4) 96%

Which atom contains exactly 15 protons?
 
 1. P-32
 2. S-32
 3. O-15
 4. N-15