Which of the following is a combination reaction?
a)CaCO3→ CaO + CO2
b)H2+ Cl2→ 2HCl
c)H2CO3→ H2O + CO2
d)2KClO3→ 2KCl + 3O2
Correct answer is option 'B'. Can you explain this answer?

Class 10 Question

By Konika Paul · Dec 17, 2019 ·Class 10
42 Answers
Eren Jaeger answered 4 weeks ago
According to combination reaction 2 reactants combine to form a single product here hydrogen and chlorine combine together to form hydrochloric acid hence it is a combination reaction.

Kuldeep Kuldeep answered 3 weeks ago
Option b is correct. Because, option a, c, d are the examples for the decomposition reaction.

Note:-Two reactants (H2 + Cl2)combines to form a single product (HCl) is stated as Combination Reaction

Nikhil Bishnoi answered Dec 17, 2019
Hey
your question is wrong
check it

Mikasi Ambade answered Jul 06, 2020
A combination reaction is a reaction where a single product is formed from 2 or more reactants.Since here option b fulfills this condition and rest of them are Decomposition reaction, Option b is combination reaction...

Drishti Kumari answered 4 weeks ago
Combination reaction is the reaction in which only one product is form from two or more reactants . So, option (B) is correct in which only one product is formed .

Sachin Bohra answered 3 weeks ago
Option "B" is correct.
Reason-- Because in a combination reaction a single product is formed from two or more reactants.

Friends I hope you understand it.
Thanks.

Cjseven Ufo answered 2 weeks ago
Combination means combine.
MTlb Millar ek bne
Format of combination reaction
A + B = AB
AB EXAMPLES ME JO ISS FORMAT ME AAYE USE TICK KRO

Tanisha Singh answered 3 weeks ago
Because hydrogen and chlorine are combined to form hydrochloric acid

Bad Boy answered Jul 06, 2020
Option B is right one because as Hydrogen and chlorine combines to form hydrogen chloride

Jitendra Saha answered Jun 30, 2020
Option b is the correct option of combination because in combination reation means combine of two element forming a single element so here in b , hydrogen(H) and chlorine(Cl) that is a single compound that is hydrochloric acid(HCl)

Divyanshu Pal answered 2 weeks ago
Yes correct option is 'B' because a reaction in which two or more reactant are combine to form simple product is called combination reaction.

Aisha Agrawal answered 6 days ago
As, there is two reactant( H2 + Cl2 ) which react to form a single substance(2Hcl) .... #reactions

Vaishnavi Saxena answered 2 weeks ago
Ji haan mai explain kr skti hoon .. proof krne k lie combination reaction kya hota h wo batana zaroori h . so a reaction where two or more elements or compounds combine to form a single compound.. is known as combination reaction.
ab baat aai ki ye b option sahi kese h
to wo aise ki
yaha pr H2 aur Cl2 dono mix ho gae h aur 2HCl form kr rhe h
so where the elemnts are gonna form they r combination reaction ..
i hope samjh aaya hoga

Paridhi Nagori answered Dec 17, 2019
A C and D are decomposition reactions.Only reaction B is combination reaction as hydrogen and chlorine combines to form a single product hydrochloric acid

R C Kachhatia answered Jul 06, 2020
Answer is 'B'.

Unknown answered 4 weeks ago
Option b itself...

Tanishka Gupta answered 4 weeks ago
Yeah its option b clear by its definition

Raju Jha answered 2 weeks ago
The answer is (b)

Arijit Majumder answered 3 weeks ago
We know that those reactions in which two or more reactants combine to form a single compound , are known as Combination reactions .
Here in the given question we find that :
(b) H2 + Cl2 ---- HCl is a reaction which satisfies the above mentioned criteria. Hence we can call it as a combination reaction .

Diana Nair answered Jun 30, 2020
B is the correct answer as two or more reactants join together as a single product and the rest of the options are wrong because they all are decomposition reaction not combination reaction.Decomposition reaction is a type of reaction in which one reactants break to form two or more products.

Abhi Prajapati answered Dec 16, 2019
A B and C option are decombination reaction only D are combination reaction because a single reactant breaks down to give simpler products

Adi Rocks Channel S answered 4 days ago
Reaction in which two reactants combine to form a single product is combination reaction. so in this reaction the two reactants combine to form a single product

Uzma Tamboli answered Dec 18, 2019
A,C,D are examples of decomposition reaction and only B is combination reaction

Nirmal Kumar answered Dec 18, 2019
I think your question is wrong because option b is combination reaction

Tejaswini Mogal answered yesterday
Option b is correct answer

Ajay Kumar Sinha answered 2 weeks ago
B is a correct answer because, two or more than two reactant to give single product as known as combination reaction

Mayank Raj answered 4 weeks ago
B is correct answer.

Sameer Yadav answered Jan 03, 2020
A, C, D are Decomposition rxn onlyB is combination rxn

Poojashri M. K. answered Jun 30, 2020
Hydrogen molecule and chlorine are combining to get hydrogen chloride so it is combination reaction

Ashutosh Yadav answered Feb 04, 2020
B is the correct answer because the given product in this chemical reaction is formed by combined hydrogen and chlorine

Juweriya Wasim answered 3 weeks ago
Option (b) is correct because according to definition of combination reaction IL. A reaction in which single product is formed from two or more reactant .

Santosh Kumari answered Feb 17, 2020
The above reaction is an example of combination reaction. 
Balanced Equation:
H2 + 2Cl2 = 2HCl2

Rangit Bhattacharya answered 4 weeks ago
Combination reaction is the type of reaction where two or more reactants combine to form a single substance.
So, B is the correct answer.

Kajal Nandal answered 1 week ago
Yes,option b is a combination reaction. Because, in this reaction two reactants combine to make a product

Saurabh Kumar answered Jul 04, 2020
Option B. is correct because in this reaction two substance i.e. H2 and Cl2 combine with each other to form a single product i.e., 2HCl

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