∆x is given by ∆x=(Hydrogen energy-Lattice energy). For a salt ∆x is found to be 500 kcal mol-1.Then on increasing the temperature, its solubility in water
increase
decreases
remains same
increases initially and then decreases
If 20 mL of 0.4 N NaOH sol ution completely neutralised 40 mL of a dibasic acid, the molarity of the acid solution is :
0.1M
0.2M
0.3M
0.4M
Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T) ?
η=Ae-E/RT
η=AeE/RT
η=Ae-E/KT
η=Ae-E/T
The vapour pressure of water at 230C is 19.8 mm. 0.1 mole of glucose is dissolved in 178.2 g of water. What is the vapour pressure (in mm) of the resultant solution
19.0
19.602
19.402
19.202
The weight in grams of a non-volatile solute (M.wt:60) to be dissolved in 90 g of water to produce a relative lowering of vapour pressure of 0.02 is
4
8
6
10
x grams of water is mixed in 69 g of ethanol. Mole fraction of ethanol in the resultant solution is 0.6. What is the value of x in grams ?
54
36
180
18
The bonds in K4Fe(CN)6 are:
ionic
covalent
ionic and covalent
ionic,covalent and co-ordinate covalent bond
Which of the following statements is correct
Silicon doped with boron is an n-type semiconductor
Silicon doped with arsenic is a p-type semiconductor
Metals are good conductors of electricity
Electrical conductivity of semiconductors decreases with increasing temperature
9.8 g of H2SO4is present in two litres of a solution.The molarity of the solution is:
0.05M
0.01M
Three faradays of electricity was passed through an aqueous solution of iron(II) bromide.The weight of iron metal(at.wt=56) deposited at the cathode is(in grams):
56
84
112
168
If the length of the unit cell is 5 Ao. the smallest distance in Ao between the two neighbouring metal atoms in a face centred cubic lattice is
2.50
5.00
7.07
3.535
Which of the following set of variables give a straight line with a negative slope when plotted ?(P - vapour pressure, T = Temperature in K)
y-axis x-axis P T
y-axis x-axislog10P T
y-axis x-axislog10 P 1/T
y-axis x-axislog10 P log10 1/T