1. Which one is the Lucas reagent?
Pb/BaSO4 \mathrm{Pb} / \mathrm{BaSO}_{4} Pb/BaSO4
HCl/ZnCl2 \mathrm{HCl} / \mathrm{ZnCl}_{2} HCl/ZnCl2
MgSO4/BaCl2 \mathrm{MgSO}_{4} / \mathrm{BaCl}_{2} MgSO4/BaCl2
Ni/H2 \mathrm{Ni} / \mathrm{H}_{2} Ni/H2
2. What is the product of slopes of two straight lines which are perpendicular to one another?
111
−1-1−1
000
None\text{None}None
3. What is the ratio of diameters of two copper wires of the same resistance having lengths of ratio 1:9 1: 9 1:9 ?
1:3 1: 3 1:3
3:1 3: 1 3:1
9:1 9: 1 9:1
1:9 1: 9 1:9
4. In case of xy=yx,dydx= x^{y}=y^{x}, \frac{d y}{d x}= xy=yx,dxdy= ?
x(lny−x)y(lnx−y) \frac{x(\ln y-x)}{y(\ln x-y)} y(lnx−y)x(lny−x)
y(xlny−x)x(ylnx−y) \frac{y(x \ln y-x)}{x(y \ln x-y)} x(ylnx−y)y(xlny−x)
y(xlny−y)x(ylnx−x) \frac{y(x \ln y-y)}{x(y \ln x-x)} x(ylnx−x)y(xlny−y)
None
5. Which one forms the most compounds?
O \mathrm{O} O
H \mathrm{H} H
S \mathrm{S} S
C \mathrm{C} C