Assertion (A): Valency of an element cannot not be zero but oxidation number can be.

Monjur Alahi

In the following questions statement of Assertion (A) is followed by statement of Reason(R) is given. Choose the correct option out of the choices given below:-

(a)Both A and R are true and R is the correct explanation of the A.

(b)Both A and R are true and R is not the correct explanation of the A.

(c)A is true but R is False

(d)Both A and R are false.

Assertion (A): Valency of an element cannot not be zero but oxidation number can be.

Reason(R): Valency is the combining capacity whereas oxidation number refers to charge which an atom carries when present in the combined state.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

(b) Both A and R are true and R is not the correct explanation of the A.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
P, Q, R and S are four men. P is the oldest but not the poorest. R is the richest but not the oldest. Q is older than S but not than

(b) Q > S, P > Q, R > Q Age: As, Q > S, P > Q, R > Q Also, P is the oldest. ∴ P > R > Q >...

1 Answers 1 views
Assertion (A): Fluorine being most electronegative element its oxidation state is -1. Reason(R) : Fluorine never shows disproportionate reaction.

(a) Both A and R are true and R is the correct explanation of the A.

1 Answers 1 views
Assertion (A): Oxidation involves loss of electrons. Reason(R) :During oxidation number of an element decreases.

(b)Both A and R are true and R is not the correct explanation of the A.

1 Answers 1 views
The oxidation number of C in CH2O is a) -1 b) +2 c) zero d) -4

The oxidation number of C in CH2O is zero

1 Answers 1 views
CCl4 does not show hydrolysis but SiCl4 is readily hydrolyzed because a) Carbon cannot expand its octet but silicon can expand

a) Carbon cannot expand its octet but silicon can expand

1 Answers 1 views
Calculate the atomic number of an element whose mass number is 31 and number of neutrons is 13. What is the symbol of the element?

We know that, mass number = Number of protons + Number of neutrons  But number of protons is equal to the atomic number.  ∴ Mass number = Atomic number + number of...

1 Answers 1 views
An element 'M' has atomic number 12. (i) Write its electronic configuration and valency.

(i) Electronic Configuration -2,8,2 Valency - 2. (ii) Metal There are two electrons in its outermost shell and it easily loses them to form a positive ion. (iii) M -2 O-2 M2O2 = MO It is a...

1 Answers 1 views
An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason :

Position of P Group-2 Because it has 2 valence electrons/ 2, S, 8, 2 Period-4 Because it has 4 shells/2,8,8,2 Position of Q Croup-17 Because it has 7 valence electrons/ 2, 8, 7 Period-3 Because it has 3 shells/...

1 Answers 1 views
The atomic number of an element is 20. (a) Write its electronic configuration and determine its valency.

(a) X(20)-2,8,8,2 Valence electrons- 2 Hence valency is   2 (b) It is a metal (c) XCl2   (d) It is more reactive than Mg as reactivity increases down the group Mg- III Period And X20 (Ca)- IV Period

1 Answers 1 views
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.

(i) The position of elements X in the modern periodic table is group number 17 and period number 3. The position of element Y in the modern periodic table is...

1 Answers 2 views
X