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__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

[A_{0}] – [A_{t}] = k_{0}t ; 1.0 – 0.75 = k_{0} × 0.05, k_{0} = 5

Again, 1.0 – 0.4 = k_{0} × 0.12, k_{0} = 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 H _{2}SO_{4}, 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 : **

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