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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...

Html MCQ Questions with Answers

HTML Objective Questions with Answers

The following are very standard and most frequently asked objective ( MCQ ) questions which are used to asked generally in the various competitions . Any one can learn easily these html objectives. 

1. What is the correct HTML tag for the largest heading?

 A.   <h1>
 B.   <head>
 C.   <h2>
 D.   <header>

Answer: A. <h1>

2. How do you add a background color to an HTML element?

  A. Using the "bgcolor" attribute
  B. Using the "background" CSS property
  C. Using the "style" attribute with the "background-color" property
  D. Using the "color" attribute

Answer: C. Using the "style" attribute with the "background-color" property

3. What is the correct HTML tag for creating a hyperlink?

 A. <link>
 B. <a>
 C. <href>
 D. <anchor>

Answer: B. <a>

4. Which HTML attribute is used to specify the target of a hyperlink?

 A. target
 B. href
 C. name
 D. link

Answer: A. target

5. What is the correct HTML tag for creating an unordered list?

 A. <ul>
 B. <ol>
 C. <list>
 D. <li>

Answer: A. <ul>

6. Which HTML input tag is used to create a text field for user input?

   A. <input type="button">
   B. <input type="submit">
   C.  <input type="text">
   D.  <input type="checkbox">

Answer: C) <input type="text">

7. What is the purpose of the <input type="password"> tag?

   A. To create a dropdown list
   B. To create a checkbox
   C. To create a text field where the input is masked as asterisks
   D.  To create a button

Answer: C) To create a text field where the input is masked as asterisks

8. Which HTML input tag is used to create a checkbox that can be selected or deselected?

   A. <input type="checkbox">
   B. <input type="radio">
   C. <input type="submit">
   D.  <input type="text">

Answer: A) <input type="checkbox">

9. Which HTML input tag is used to create a radio button that can be selected or deselected, but only one radio button in a group can be selected at a time?

 * A) <input type="checkbox">
 * B) <input type="radio">
 * C) <input type="submit">
 * D) <input type="text">

Answer: B) <input type="radio">

10. Which HTML input tag is used to create a button that, when clicked, submits the form data to the server?

   A. <input type="button">
   B.  <input type="submit">
   C. <input type="reset">
   D.  <input type="text">

Answer: B) <input type="submit">

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