Chemistry Test ...

In \(P O_{4}^{3-}\), the formal charge on each oxygen atom and the \(P-O\) bond order respectively are:

Directions: The following question has four choices, out of which ONE or MORE are correct.

When phenol is treated with CHCl₃ and NaOH, followed by acidification, salicylaldehyde is obtained. Which of the following species is/are involved in the above mentioned reaction as intermediate(s)?

\(0.400 \mathrm{g}\) of impure \(\mathrm{CaSO}_{4}\) (Molar mass \(=136\) ) solution when treated with excess of barium chloride solution, gave \(0.617 \mathrm{g}\) of anhydrous \(\mathrm{BaSO}_{4}(\mathrm{Molar}\) mass \(=233) .\) The percentage of \(\mathrm{CaSO}_{4}\) present in the sample is

At temperature \(300 \mathrm{K}\) for reaction \(\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+\) \(2 \mathrm{H}_{2} \mathrm{O} 0 ; \Delta \mathrm{H}=-336.2 \mathrm{kcal} .\) The approximate value of \(\Delta \mathrm{U}\) at \(300 \mathrm{K}\) for the same reaction \(\left(\mathrm{R}=2\right.\) cal degree- \(\left.1 \mathrm{mol}^{-1}\right)\) will be

Directions: The following question has four choices, out of which ONE or MORE are correct.

An ionic compound PQ has the radius ratio of the cation and anion as expressed below:

\(\frac{r^{+}}{r}=\sqrt{\frac{3}{2}}-1\)

Which of the following statements is correct about the ionic crystal?

Consider the reaction, \(2 A+B \rightarrow\) Products, When concentration of B alone was doubled, the rate did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is:

Products A and B formed in the following reactions are respectively

Directions:The following question has four choices, out of which ONE or MORE are correct.

Consider the following graph:

From this graph, it is clear that

A mixture of gaseous nitrogen and gaseous hydrogen attains equilibrium with gaseous Ammonia according to the reaction.

\[\frac{1}{2} N_{2(g)}+\frac{3}{2} H_{2(g)} \rightleftharpoons N H_{3(g)}\]

It is found that at equilibrium when temperature is \(673 \mathrm{K}\), atmospheric pressure is \(100,\) moles of gaseous nitrogen and gaseous hydrogen are in ratio 1: 3 and mole percent of gaseous ammonia is \(24 .\) The equilibrium constant Kp for the reaction at the above condition is-

Directions: The following question has four choices, out of which ONE or MORE are correct.

Which of the following oxides can act both as a reducing agent as well as an oxidising agent?

Directions: The following question has four choices, out of which ONE or MORE are correct.

Which of the following carbides can give hydrocarbon on reaction with water?

Which one of the following is wrong?

Which of the following order is wrong ?

The ionization energy of the ground state of hydrogen atom is \(2.18 \times 10^{-18} \mathrm{J} .\) The energy of an electron in its second orbit would be:

The compound which gives positive test with Tollen’s reagent but does not give a red precipitate with Fehling’s solution is