The number of electrons in the species ${\mathrm{H}}_2^{+} , {\mathrm{H}}_2 , {\mathrm{O}}_2^{+}$,  are respectively

1. 15, 2, 1

2. 15, 1, 2

3. 1, 2, 15

4. 2, 1, 15

The maximum number of neutrons are present in the nuclei of

$$\begin{gathered} 1. {\mathrm{O}}_8^{16} \\ 2. {\mathrm{Mg}}_{12}^{24} \\ 3. {\mathrm{Fe}}_{26}^{56} \\ 4. {\mathrm{Sr}}_{38}^{88} \end{gathered}$$

The complete symbol for the atom with the given atomic number (Z) and atomic mass (A) would be, respectively,
i. Z = 17 , A = 35.
ii. Z = 92 , A = 233.
iii. Z = 4 , A = 9.
1.  ${}_4{}^9\mathrm{Be}$   ${}_{92}{}^{233}\mathrm{U}$     ${}_4{}^9\mathrm{Be}$
2.  ${}_{17}{}^{35}\mathrm{Cl}$    ${}_{92}{}^{233}\mathrm{U}$    ${}_4{}^9\mathrm{Be}$
3.  ${}_4{}^9\mathrm{Be}$    ${}_{17}{}^{35}\mathrm{Cl}$     ${}_{92}{}^{233}\mathrm{U}$
4. ${}_{92}{}^{233}\mathrm{U}$    ${}_4{}^9\mathrm{Be}$    ${}_{17}{}^{35}\mathrm{Cl}$

Property which is same for the following species is:

 N^3–, O^2–, F^–, Na⁺, Mg²⁺ and Al³⁺ 

1. Ionic radii

2. Number of electrons

3. Nuclear charge

4. None of the above 

An atom of an element contains 29 electrons and 35 neutrons. The number of protons in the element would be

1. 29

2. 35

3. 6

4. 64

The charge on the oil drop is –1.282 × 10^–18C. The number of electrons present in it would be 

1. 15

2. 8

3. 2

4. 6

The number of protons, neutrons and electrons in ${}_{71}{}^{175}\mathrm{Lu}$, respectively, are:

1.  104, 71 and 71

2.  71, 71 and 104

3.  175, 104 and 71

4.  71, 104 and 71 

Which of the following has greater number of electrons than neutrons?

1. Al³⁺

2. O^2-

3. F^-

4. C

The number of electrons in  ₁₉ K with quantum numbers n=3; l=0 is/are

1. 1

2. 2

3. 4

4. 3

Assertion: Zn(ll) salts are diamagnetic.

Reason: Zn²⁺ ion has one unpaired electron.

1. Both the assertion and the reason are true and the reason is the correct explanation of the assertion. 

2. Both the assertion and the reason are true but the reason is not the correct explanation of the assertion.

3. The assertion is true, but the reason is incorrect.

4. Both the assertion and the reason are false statements.