Arrange the following in the decreasing order of basic strength in gas phase:
(A) \(C _2 H _5 NH _2\)
(B) \(\left( C _2 H _5\right)_2 NH\)
(C) \(\left( C _2 H _5\right)_3 N\)
(D) \(NH _3\)

Ultra pure silicon can be obtained by

On what basis Scandium is considered as transition metal, but Zinc is not considered as transition metal?

0.01 molal aqueous solutions of strong electrolytes \(NaCl , KCl , MgSO _4\) and \(K _2 SO _4\) are prepared.Which of the following statements is correct regarding their osmotic pressure ? (Assume complete dissociation of solute particles)

Degree of dissociation, when molar conductivity of X at its concentration C is 24.14 and its limiting molar conductivity is 48.28 will be :

Answer the question on the basis of passage given below :
A colloid is a heterogeneous system in which a substance is dispersed (dispersed phase) as fine particles in another substance called dispersion medium.
Their particle size is intermediate between that of pure solutions (less than 1 nm) and suspensions (greater than 1000 nm). They are known for interesting properties such as enormous surface area, Tyndall effect, Brownian motion etc.
They are widely used in industries and day to day life.
Some prominent uses of colloids are those in smoke precipitators, purification of water, medicines, cleansers etc.
Which of the following statement is false regarding charge on sol particles ?

Answer the question on the basis of passage given below:
Aldehydes are generally more reactive than ketones in nucleophilic addition reactions due to steric and electronic reasons. Sterically, the presence of two relatively large substituents in ketones hinders the approach of nucleophile to carbonyl carbon more than aldehydes having only one such substituent Electronically aldehydes are more reactive than ketones because two alkyl groups reduce the elctrophilicity of the carbonyl more effectively than in former.
Write the reaction sequence when phthalic acid reacts with ammonia.


Choose the correct answer from the options given below:

The area (in sq.units) of the region bounded by the curves \(y = x\) and y = \(x^3\) is:

The intensity ratio of the two interfering beams of light is \( \beta \). The value of \( \left[ \frac{I_{\text{max}} - I_{\text{min}}}{I_{\text{max}} + I_{\text{min}}} \right] \) is

Identify the correct statements about Amazon rain forest.
(A) They are called lungs of the planet
(B) The fall in tundra region of USA
(C) They have the greatest bio-diversity on earth
(D) They are being cut and cleared for cultivating soyabean
Choose the correct answer from the options given below:

What is the particle X in the fusion reaction shown below ?
\({ }_1^2 H +{ }_1^2 H \rightarrow{ }_2^3 He + X +3.27 MeV\)

A swimmer whose speed in still water is \(6 km / hr\), swims between two points in a river and returns to the starting point. He took 20 minutes more to cover the distance upstream than downstream. If the speed of the stream is \(3 km / hr\), then the distance between the two points is:

Match List I with List II

LIST I	LIST II
A. If \(4 \sin ^{-1} x+\cos ^{-1} x=\pi\), then \(x\) equal to	I. \(\frac{\pi}{2}\)
B. The value of \(\frac{1-\tan ^2 15^{\circ}}{1+\tan ^2 15^{\circ}}\) is	II. \(\frac{1}{2}\)
C. If \(x+\frac{1}{x}=2\), then principal value of \(\sin ^{-1} x\) is	III. \(\frac{3 \pi}{4}\)
D. Two angles of a triangle are \(\cot ^{-1} 2\) and \(\cot ^{-1} 3\), then third angle is	IV. \(\frac{\sqrt{3}}{2}\)