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 ?
A. 54
B. 36
C. 180
D. 18
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
A. 19.0
B. 19.602
C. 19.402
D. 19.202
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 :
A. 0.1M
B. 0.2M
C. 0.3M
D. 0.4M
Which of the following statements is correct
A. Silicon doped with boron is an n-type semiconductor
B. Silicon doped with arsenic is a p-type semiconductor
C. Metals are good conductors of electricity
D. Electrical conductivity of semiconductors decreases with increasing temperature
Which of the following set of variables give a straight line with a negative slope when plotted ?(P - vapour pressure, T = Temperature in K)
A. y-axis x-axis P T
B. y-axis x-axislog10P T
C. y-axis x-axislog10 P 1/T
D. y-axis x-axislog10 P log10 1/T
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):
A. 56
B. 84
C. 112
D. 168
The bonds in K4Fe(CN)6 are:
A. ionic
B. covalent
C. ionic and covalent
D. ionic,covalent and co-ordinate covalent bond
Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T) ?
A. η=Ae-E/RT
B. η=AeE/RT
C. η=Ae-E/KT
D. η=Ae-E/T
∆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
A. increase
B. decreases
C. remains same
D. increases initially and then decreases
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
A. 2.50
B. 5.00
C. 7.07
D. 3.535
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
A. 4
B. 8
C. 6
D. 10
9.8 g of H2SO4is present in two litres of a solution.The molarity of the solution is:
A. 0.1M
B. 0.05M
C. 0.2M
D. 0.01M