Which one of the following will show Tyndall effect ?

The correct order of increasing basicity in aqueous medium for
I. \(NH_3\)
II. \(CH_3CH_2NH_2\)
III. \((CH_3CH_2)_2NH\)
IV. \((CH_3CH_2)_3N\) is :
A. \((II) < (I) < (IV) < (III)\)
B. \((II) < (I) < (III) < (IV)\)
C. \((I) < (II) < (IV) < (III)\)
D. \((I) > (II) > (IV) > (III)\)
Choose the correct answer from the options given below :

Thiosulphte \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) is oxidized to __________ in presence of permanganate ion.

Answer the question on the basis of passage given below :
Formaldehyde is the first member of the aldehydic series. It is present in green leaves of plants where its presence is supposed to be due to the reaction of \(CO_2\) with water in the presence of sunlight and chlorophyll. Commercially, formaldehyde is obtained by the controlled oxidation of methane in the presence of molybdenum oxide (\(MoO\)) acting as a catalyst. Formaldehyde is a constituent of a number of polymers also called resins. These are non volatile solids or semi solids which are obtained directly from certain plants and can be synthesized in the laboratory.
Question: Formaldehyde on reaction with benzaldehyde in basic medium gets converted to:

Reaction of Phenol with conc. \(HNO _3\) gives

"Wood spirit " is

Common oxidation state of lanthanoids is:

The presence of which disease is confirmed by Widal Test?

How does the osmotic pressure of a solution vary with the temperature?

The magnetisation at the centre of a bar magnet (magnetic length 10 cm), having pole strength 6.3 A m, and area of cross-section \(A = 0.70 \text{ cm}^2\) is

Which of the following is the correct expression for force due to a magnetic field (\( \vec{B} \)) on a straight conductor of length (\( l \)) carrying current \( I \)?

Solution of the differential equation \(\frac{d y}{d x}+\frac{3 x}{2 y}=0\) with y(1) = 1 is:

Identify the role of deoxyribonucleoside triphosphates in DNA replication?