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Chemical formula

Example: Balanced Chemical Equations with Subscripts Water: $$\ce{H2O}$$ Carbon dioxide: $$\ce{CO2}$$ Iron(III) hydroxide (Rust reaction): $$\ce{4Fe + 3O2 + 6H2O -> 4Fe(OH)3}$$ Copper(II) sulfate pentahydrate: $$\ce{CuSO4 * 5H2O}$$ Chemical Formulas in Chemistry Chemical formulas are the symbolic representations of chemical substances. They show the elements present in a compound and the ratio in which the atoms of these elements combine. Chemical formulas are essential for understanding the composition, structure, and behavior of compounds in chemical reactions. 1. What is a Chemical Formula? A chemical formula uses symbols of elements and numerical subscripts to represent the composition of a substance. For example, the formula for water is: $$ \ce{H2O} $$ This indicates that each water molecule is made up of 2 atoms of hydrogen and 1 atom of oxygen. 2. Types of Chemical Formulas Empirical Formula Molecular Formula Structural Formula...
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Alkyne MCQ

1. What is the product formed when acetylene reacts with hypochlorous acid ? 

(a) Ch3COCl 
(b) ClCH2CHO
(c) Cl2CHCHO 
(d) ClCH2COOH 

Answer: (c) 

2. When 2 - butyne is treated with dil. H2SO4 / HgSO4 , the product formed is 

(a) Butanol - 1
(b) Butanol - 2 
(c) 2 - Butanone 
(d) Butanal 

Answer: (c) 

3. Hydration of which of the following yields a ketone ? 

(a) Propyne 
(b) Ethene 
(c) Propene 
(d) Ethyne 

Answer: (a) 

4. When 2 - butyne is treated with H2 in presence of Pd - BaSO4 ; the product formed will be 

(a) cis - 2 - butene 
(b) trans - 2 - butene 
(c) 1-butene 
(d) 2 - hydroxybutane 

Answer: (a) 

5. 2 - Hexyne gives trans - 2 - hexene on treatment with 

(a) Li / NH3 
(b) Pd / BaSO4 
(c) LiAlH4 
(d) Pt / H2 

Answer: (a) 

6. Which of the following reagents will be able to distinguish between 1- butyne and 2 - butyne ? 

(a) NaNH2 
(b) HCl 
(c) O2
(d) Br2 

Answer: (a) 

7. Catalyst used in dimerisation of acetylene to prepare chloropropene is 

(a) HgSO4 + H2SO4 
(b) Cu2Cl2
(c) Cu2Cl2 + NH4OH 
(d) Cu2Cl2 + NH4Cl 

Answer: (d) 

8. Which one of the following compounds is not formed in the " catalytic cracking " of octane ? 

 (a) Pentane 
 (b) Butene 
 (c) Propene 
 (d) Hydrogen gas 

Answer: (d) 

9. Which one of the following compounds is not formed in the metal catalysed thermal dehydrogenation of butane ? 

 (a) Hydrogen gas 
 (b) cis - butene 
 (c) trans - butene 
 (d) 1,2 - butadiene 

Answer: (d) 

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