Which of them form complex bond with H2S in the enzymes in blood?

1) Iron

2) Cobalt

3) Haemoglobin

4) None of above

The standard reduction potential for two reaction are given below
AgCl(s) + e^- → Ag(s) + Cl^-(aq), E°=0.22V
Ag+(aq) + e^- → Ag(s) , E°=0.80V
the solubility product of AgCl under standard condition of temperature (298K) is given by

1) 1.6 ×10^-10
2) 1.5 ×10^-10
3) 3.2 ×10^-8
4) 3.2 ×10^-10

In reference to biological role, Ca²⁺ ions are important in

1) triggering the contraction of muscles

2) generating the right electrode potential across cell membrane

3) hydrolysis of ATP

4) defence mechanism

A gaseous mixture enclosed in a vessel of volume V consists of one mole of gas A with γ(=C_P/C_V)=5/3 and another gas B with γ = 7/5

at a certain temperature T. The relative molar masses of the gas A and B are 4 and 32 , respectively. The gases A and B do not react with each other and are assumed to be ideal. The gaseous mixture follows the equation PV^19/13=  constant, in adiabatic processes. Compute the speed of sound in the gaseous mixture at T=300 K.

1) v = 501m/s
2) v = 401m/s
3) v = 701m/s
4) v = 801m/s

The rate of a reaction quadruples when the temperature changes from 300 to 310K. What is the activation energy of this reaction?
(Assume activation energy and preexponential factor are independent of temperature ; In 2= 0.693; R= 8.314   Jmol⁻¹K⁻¹)

1) 0.60 ×10⁵Jmol⁻¹
2) 2.46×10⁵Jmol⁻¹
3) .246×10⁵Jmol⁻¹
4) 4.00 ×10⁵Jmol⁻¹

If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of initial and final volumes at the same temperature and pressure would be : 

1) 1:2
2) 2:1
3) 1:3
4) 3:1

Identify the correct order of boiling points of the following compounds having nearly same molecular weight.

1) I > II > III > IV

2) IV > III > II > I

3) III > IV > II > I

4) IV > II > III > I

The effective atomic number of iron in [Fe(CN)₆]^3- is
1) 34
2) 36
3) 37
4) 35

An organic compound, C₃H₆O does not give a precipitate with 2, 4 dinitrophenyl-hydrazine reagent and does not react with metallic sodium. It could be

1) CH₃ –CH₂ –CHO
2) CH₂ =CH–CH₂OH 
3) CH₃ –CO–CH₃ 
4) CH₂ =CH–O–CH₃

The solubility of K₂SO₄ in water is 16 g per 100 mL at 50^oC. The least weight of water that will dissolve 4 g of this substance at the same temperature is

1)  25 g

2)  10 g

3)  50 g

4)  75 g