Integer Answer Type Questions: Chemical Kinetics & Nuclear Chemistry - JEE Advanced

Integer Value Correct Type

1. The total number of a and b particles emitted in the nuclear reaction 

Ans: 8

Solution : 

Hence total number of particles emitted are 2 +6 = 8

2. The concentration of R in the reaction R → P was measured as a function of time and the following data is obtained:

The order of reaction is                                     (2010)

Ans: 5

Solution : The integrated form of a zero-order reaction is
[A₀] - [A_t] = k₀t ; 1.0 - 0.75 = k₀ × 0.05, k₀ = 5
Again, 1.0 - 0.4 = k₀ × 0.12, k₀ = 5

3. The number of neutrons emitted when   undergoes controlled nuclear fission to   is               (2010)

Ans: 3

Solution : 

235 = 142 + 90 + y Þ y = 3.
The number of neutrons emitted are 3.

4. An organic compound undergoes first-order decomposition. The time taken for its decomposition to 1/8 and 1/10 of its initial concentration are t_1/8 and t_1/10 respectively. What is the value of                 (2012)

Ans: 9

Solution : 

5. The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. To which
  group, element X belongs in the periodic table?                       (2012)

Ans:  8

Solution : 
Balancing the atomic mass and atomic number
63 + 1 = (6 × 1) + 4 + 2 + A ⇒ A = 52
29 + 1 = (6 × 0) + 2 + 2 + Z ⇒ Z = 26

 Thus, 

Hence, X belongs to group 8 in the periodic table.

6. A closed vessel with rigid walls contains 1 mol  of   and 1 mol of air at 298 K. Considering complete decay of  to , the ratio of the final pressure to the initial pressure of the system at 298 K is                        (JEE Adv. 2015)

Ans: 9

Solution :  Number of moles in gas phase, at start (n_i) = 1

Now number of moles in gas phase, after decomposition (n_F)
= 1 + 8 = 9 mole
at constant temperature and pressure

7. In dilute aqueous H₂SO₄, the complex diaquodioxalatoferrate(II) is oxidized by . For this reaction, the ratio of the rate of change of [H⁺] to the rate of change of 

Ans: 8

Solution :