Writing Chemical Equation

Q.

Write the formulae for the following.
Copper(II) oxide

Q.

Question 1

(i)What is observed when a solution of potassium iodide solution is added to a solution of lead nitrate?

(ii)Name the type of reaction.

Q. What does the sign $\downarrow$ indicates in a chemical reaction. Also identify the type of reaction.

1. release of gas, displacement reaction
2. dissolution of gas, decomposition reaction
3. formation of a precipitate, precipitation reaction
4. lowering of temperature, decomposition reaction

Q. Match the given physical states to the correct symbols as used in chemical equations.

Physical state	Symbol
1. Aqueous	(A) (l)
2. Concentrated	(B) (dil.)
3. Dilute	(C) (aq)
4. Liquid	(D) (aqu)
	(E) (conc.)
	(F) (con)

1. 1 - D
   2 - F
   3 - B
   4 - A
2. 1 - D
   2 - E
   3 - B
   4 - A
3. 1 - C
   2 - F
   3 - B
   4 - A
4. 1 - C
   2 - E
   3 - B
   4 - A

Q.

Ravi conducted an experiment, he added dil.hydrochloric acid to zinc granules in a conical flask. Zinc chloride was formed and hydrogen was liberated. He represented the reaction in the following manner.

$\text{Zn}+\text{HCl}-{\text{H}}_2\to {\text{ZnCl}}_2$

Is the reaction represented properly?

1. True

2. False

Q. Statement 1: While balancing equations, same number of atoms are there on reactant side and the product side.
Statement 2: For all regular chemical equations, the conservation of matter holds good.

1. Both the statements 1 and 2 are correct and statement 2 is not correct explanation of statement 1.

2. Both the statements 1 and 2 are correct and statement 2 is correct explanation of statement 1.

3. Statement 1 is not correct but statement 2 is correct.

4. Statement 1 is correct but statement 2 is not correct.

5. Both the statements 1 and 2 are not correct.

   
   

Q.

Fill in the blank spaces by choosing the correct words from the given list.

List: products, yield, balanced, left, formulae

2. The reactants are always written on the ____ hand side of a chemical equation.

Q.

Question 1

(i)What is observed when a solution of potassium iodide solution is added to a solution of lead nitrate?

(ii)Name the type of reaction.

Q.

Which among the following is written on the left-hand side of a chemical equation?