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Standard XII

Chemistry

Groups

The atomic nu...

Question

The atomic numbers of the three elements $P$ , $Q$ and $R$ are $5$ , $9$ and $13$ respectively. Which two elements show similar chemical properties?

P

and

Q

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P

and

R

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Q

and

R

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P

Q

and

R

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Solution

The correct option is A $P$ and $R$
The elements of atomic number $5, 9, 13$ belong to IIIA,VIIA,IIIA group respectively. Thus element of atomic number $5$ & $13$ have similar properties as they belong to the same group and elements of same group have similar properties. Hence answer is option B

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Similar questions

Q. Read the given observations for four elements

_{Z_{1}}^{A_{1}} P,_{Z_{2}}^{A_{2}} Q,_{Z_{3}}^{A_{3}} R

and

_{Z_{4}}^{A_{4}} S

carefully. Here Z represents atomic number and A represents mass number.
(i) Elements P and R shows similar chemical properties.
(ii) Elements Q and S belong to different groups.
(iii) For elements P and R,

Z_{1} = Z_{3}

and

A_{1} \neq A_{3}

.
(iv) For elements Q and S,

Z_{2} \neq Z_{4}

and

A_{2} = A_{4}

.
Which of the following statements is correct?

Q. The atomic numbers of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R
(b) Q and S
(c) P and S
(d) R and S

The atomic number of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R (b) Q and S (c) P and S (d) R and S

The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is :

(a) P (b) Q (c) R (d) S

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be :

(a) P

(b) Q

(d) S

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The atomic numbers of the three elements P, Q and R are 5, 9 and 13 respectively. Which two elements show similar chemical properties?

The correct option is A P and RThe elements of atomic number 5,9,13 belong to IIIA,VIIA,IIIA group respectively. Thus element of atomic number 5 & 13 have similar properties as they belong to the same group and elements of same group have similar properties. Hence answer is option B

The atomic numbers of the three elements $P$ , $Q$ and $R$ are $5$ , $9$ and $13$ respectively. Which two elements show similar chemical properties?

The correct option is A $P$ and $R$
The elements of atomic number $5, 9, 13$ belong to IIIA,VIIA,IIIA group respectively. Thus element of atomic number $5$ & $13$ have similar properties as they belong to the same group and elements of same group have similar properties. Hence answer is option B