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Isobars and I...

Isobars and Isotopes

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Q. Isotopes of an element have:

Different chemical and physical properties
Similar chemical and physical properties
Similar chemical but different physical properties
Similar physical but different chemical properties

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Q. Which of the following species is isoelectronic with the hydride ion?

$H^{+}$
$H e^{+}$
He
Be

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Q.

Which of the following statement is incorrect for the isoelectronic species?

Isoelectronic species have the same number of electrons.
Isoelectronic species have different numbers of protons.
In isoelectronic species, the ionic radii decrease with an increase in nuclear charge.
None Of These

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Q. From the following nuclei, select the pairs of isotopes.

(i)_{92}^{238} U (i i)_{90}^{234} T h (i i i)_{92}^{234} U (i v)_{91}^{234} P a

(i) and (iii) are isotopes
(i) and (iv) are isotopes
(i) and (ii) are isotopes
(ii) and (iii) are isotopes

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Q. Which of the following is a pair of isodiaphers?

$_{29}^{65} C u a n d_{24}^{55} C r$
$_{29}^{65} C u a n d_{24}^{52} C r$
$_{92}^{238} U a n d_{90}^{231} T h$
$_{92}^{235} U a n d_{90}^{232} T h$

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Q.

The number of moles of $B a C l_{2} . 2 H_{2} O$ in a pure sample that contains $\frac{3}{8}$ kilomoles of oxygen atoms is .

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Q. An element is represented by

_{Z} X^{A}

, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isoelectronic: Species/ elements having same number of electron
Isodiaphers: Elements having same value of

| (A - 2 Z) |

Isotopes: Atoms having same number of proton

Which of the following is a pair of isodiaphers?

$_{19}^{39} K a n d_{9}^{19} F$
$_{6}^{13} C a n d_{7}^{14} N$
$_{92}^{238} U a n d_{90}^{231} T h$
$_{52}^{130} T e a n d_{54}^{130} X e$

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Q. Calculate the formula unit mass of

Z n O, N a_{2} O and K_{2} C O_{3}

respectively.
Given atomic mass of

Z n = 65 u N a = 23 u K = 39 u C = 12 u O = 16 u

None of the above
62 g, 81 g, 138 g
81 u, 62 u, 138 u
81 u, 81 u, 138 u

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Q. Isotone of

_{32}^{76} G e

is/are:

$_{32}^{77} G e$
$_{33}^{77} A s$
$_{34}^{77} S e$
$_{34}^{78} S e$

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Q. The sum of the number of neutrons and protons in the three isotopes of hydrogen

(^{1} H,^{2} H,^{3} H)

is:

6
5
4
3

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Q. The isotones of

_{56}^{138} B a

are:

$_{57}^{139} L a$ and $_{38}^{88} S r$
$_{42}^{92} M o$ and $_{58}^{140} C e$
$_{58}^{140} C e$ and $_{42}^{92} M o$
$_{57}^{139} L a$ and $_{58}^{140} C e$

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Q.

Which of the following are isotones with each other?

$_{14}^{30} S i$
$_{15}^{31} P$
$_{16}^{32} S$
$_{17}^{35} C l$

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Q. The sum of the number of electrons, protons and neutrons in the three isotopes

(^{12} C,^{13} C,^{14} C)

of carbon is:

36
57
18
39

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Q. In two elements,

_{Z_{1}}^{M_{1}} A a n d_{Z_{2}}^{M_{2}} B, M_{1} \neq M_{2} a n d Z_{1} \neq Z_{2} but (M_{1} - Z_{1}) = (M_{2} - Z_{2}) .

A and B are:

Isotones
Isobars
Isotones
Isodiaphers

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Q. Which of the following species is not isoelectronic with the others?

$N a^{+}$
$M g^{2 +}$
$O^{2 -}$
$C l^{-}$

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Q.

Which of the following are isobars?

$_{18}^{40} A r$ $_{6}^{14} C$ $_{20}^{40} C a$ $_{7}^{14} N$

[I, II] and [III, IV]
[I, III] and [II, IV]
[I, IV] and [II, III]
None of these

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Q. Which of the following pair is isodiapheres?

$C_{6}^{14} a n d N a_{11}^{23}$
$M g_{12}^{24} a n d N a_{11}^{23}$
$H e_{2}^{4} a n d O_{8}^{16}$
$C_{6}^{12} a n d N_{7}^{15}$

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Q. Which of the following are pairs of isotones?

$C l^{37}$ and $K^{39}$
$N^{15}$ and $O^{16}$
$G e^{76}$ and $S e^{76}$
Both A and B

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Q. An isotone of

_{36}^{86} K r

is _________.

$_{19}^{39} K$
$_{35}^{80} B r$
$_{40}^{90} Z r$
$_{50}^{119} S n$

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Q. An element is represented by

_{Z} X^{A}

, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isoelectronic: Species/ elements having same number of electron
Isodiaphers: Elements having same value of

| (A - 2 Z) |

Isotopes: Atoms having same number of proton

Which of the following pairs of compounds is both isoelectronic and isotopic?

$_{11}^{24} N a,_{12}^{24} M g$
$_{19}^{39} K^{+},_{19}^{40} K^{+}$
$_{8}^{16} O^{2 -},_{8}^{17} O$
$_{12}^{24} M g^{2 +},_{12}^{25} M g$

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Q. Many elements have non-integral atomic masses because

They have isotopes
Their isotopes have non-integral masses
Their isotopes have different masses
None of these

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Q. In two elements,

_{Z_{1}}^{M_{1}} A a n d_{Z_{2}}^{M_{2}} B, M_{1} \neq M_{2} a n d Z_{1} \neq Z_{2} but (M_{1} - Z_{1}) = (M_{2} - Z_{2}) .

A and B are:

Isotones
Isobars
Isotones
Isodiaphers

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