Sawaal
13
Q:

Which of the following reactions are exothermic?

 

1)   C + O2  → CO22)  2Mg + O2  → 2MgO3)  CuSO4 + 5H2O  → CuSO4.5H2O4)  All the above

A) 1 B) 2
C) 3 D) 4

Answer:   D) 4



Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

 

Generally all the combining reactions are exothermic in nature.

Subject: Chemistry
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO
Related Questions
Q:

Which of the following statements is INCORRECT?

I) Bleaching powder is a pale yellow powder

II) Dry NH3 gas turns red litmus blue

III) The pH of rain water is nearly 7

IV) The pH of acid rain is nearly 5.6

 

A) I, II and IV B) II and III
C) I and IV D) Only II
 
Answer & Explanation Answer: D) Only II

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

2 11966
Q:

There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?

A) 22 B) 7
C) 37 D) 15
 
Answer & Explanation Answer: C) 37

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 765
Q:

The element with the highest electron affinity among halogens is

A) F B) I
C) Cl D) Br
 
Answer & Explanation Answer: C) Cl

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

2 888
Q:

An unbalanced chemical equation is called a

A) rough chemical equation B) natural chemical equation
C) complex chemical equation D) skeletal chemical equation
 
Answer & Explanation Answer: D) skeletal chemical equation

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 983
Q:

When large quantities of ___ are consumed, it tends to slow metabolic processes and to depress the central nervous system.

A) Butanol B) Propanol
C) Methanol D) Ethanol
 
Answer & Explanation Answer: D) Ethanol

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 821
Q:

When iron is exposed to moist air, a reddish brown coating of hydrated Iron (III) Oxide (Fe2O3) is deposited on its surface. This reddish brown coating is called

A) alloy B) dust
C) rust D) iron
 
Answer & Explanation Answer: C) rust

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

0 927
Q:

In the Modern Periodic Table elements present in the same period will have the same

A) atomic weight B) number of shells
C) atomic number D) valence electrons
 
Answer & Explanation Answer: B) number of shells

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 653
Q:

Plaster of Paris ______.

 

I. changes into gypsum on mixing with water

II. is CaSO4.2H2O

III. is used for decoration

 

A) Only I and II   B) Only I and III  
C) Only II and III   D) All I, II and III  
 
Answer & Explanation Answer: B) Only I and III  

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 13841