The correct order of increasing boiling points of hydrides (given below) of group 15 is:
(A) \(\text{NH}_3\)
(B) \(\text{PH}_3\)
(C) \(\text{AsH}_3\)
(D) \(\text{SbH}_3\)
(E) \(\text{BiH}_3\)
Choose the correct answer from the options given below :

On warming an aldehyde with freshly prepared ammonical silver nitrate solution (Tollen's reagent) a bright silver mirror is produced due to formation of:

In Clemmensen reduction the carbonyl compound is treated with

The steam distillation method is used for the separation of 1 : 1 mixture of p-nitrophenol and o-nitrophenols because

Which solutions will have the highest boiling point?

Read the passage below and answer the question:
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. There are two types of adsorption. In physisorption, attractive forces are mainly Van der Waals while in chemical adsorption adsorbate is held with chemical bonds adsorbent. Adsorption increases with increase in pressure and decreases as temperature is du increased.
Adsorption is spontaneous because:

Which of the following compound will form a cyclic product on reaction with ethylene glycol?

Read the passage carefully and answer the questions based on the passage:
The number of reacting species (atoms, ions or molecules) taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction is called molecularity of a reaction. In the rate equation Rate \(=k[\mathrm{~A}]^x[\mathrm{~B}]^y\)
\(x\) and \(y\) indicate how sensitive the rate is to the change in concentration of A and B, respectively. Sum of these exponents, i.e., \(x +y\) gives the overall order of a reaction where \(x\) and \(y\) represent the order with respect to the reactants A and B respectively. Hence, the sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical reaction. For a first order reaction, the concentration of the reactant varies as \([\mathrm{R}]=[\mathrm{R}]_0 e^{-k t}\)
Which of the following is a zero order reaction?

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

If the lines \(\frac{1-x}{3}=\frac{y-2}{2 \lambda}=\frac{z-3}{2}\) and \(\frac{x-1}{3 \lambda}=\frac{y-1}{1}=\frac{6-z}{5}\) are perpendicular, then \(\lambda\) is equal to

Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively.
Both pipes A and B are opened together for some time and then pipe B is turned off.
If the tank is filled in 15 minutes, then after how many minutes is pipe B turned off?

When light passes from air to glass, then

The ratio for the speed of the electron in the 3rd orbit of \( \text{He}^+ \) to the speed of the electron in the 3rd orbit of the hydrogen atom will be