Chemistry

Q.

Balance the following chemical equations: ${\mathrm{HNO}}_3+\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\to \mathrm{Ca}{\left({\mathrm{NO}}_3\right)}_2+{\mathrm{H}}_2\mathrm{O}$

Q.

Balance the equation: Hydrogen Sulfide gas burns in the air to give Water and Sulfur dioxide.

Q.

Easiest way to remember the first 20 elements of a periodic table.

Q.

$BariumChloride+AluminiumSulphate\to BariumSulphate+AluminiumChloride$

Which of the following balanced chemical equation represent the above chemical reaction correctly?

1. (aq) + +

2. (aq) + +

3. (aq) + +

4. + +

Q.

What is the chemical name of water?

1. Hydrogen trioxide
2. Dihydrogen oxide
3. Hydrogen dioxide
4. Hydrogen oxygen

Q.

Write the balanced equation for hydrogen + chlorine → hydrochloride.

Q.

Define a balanced chemical equation. Why should an equation be balanced?

Q.

Give the definition of corrosion and rancidity with example?

Q.

Balance the following chemical equation: $\mathrm{Fe}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{Fe}}_3{\mathrm{O}}_4+{\mathrm{H}}_2$

Q.

Balance: $\mathrm{Na}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{NaOH}+{\mathrm{H}}_2$.

Q.

Give examples of Double displacement reactions.

Q.

The Henry's law constant for the solubility of N₂ gas in water at 298K is 1.0 x 10⁵ atm. The mole fraction of N₂ is 0.8. The number of moles of N₂ from air dissolved in 10 moles of water at 298K and 5 atm pressure is

1. 4 x 10^-5
2. 5 x 10^-4
3. 4 x 10^-6
4. 4 x 10^-4

Q.

Balance the reaction: ${\mathrm{Fe}}_2{\mathrm{O}}_3+\mathrm{CO}\to \mathrm{Fe}+{\mathrm{CO}}_2$

Q.

Write down the balanced chemical equation:

Hydrogen plus chlorine produces hydrogen chloride

Q.

2g of ferrous sulphate crystals are heated in a dry boiling tube.
(i) List any two observations.
(ii) Name the type of chemical reaction taking place.
(iii) Write the chemical equation for the reaction.

Q.

A mixture of camphor and salt can be separated by the process of ___.

1. Centrifugation

2. Distillation

3. Sedimentation

4. Sublimation

Q.

What is ${\mathrm{H}}_2\mathrm{O}$ full name?

Q.

What is the molecular mass of Nitrogen?

Q.

Chemical equation of rusting

Q.

Write three differences between graphite and diamond.

Q. What is deposition? Give a few examples of substances that undergo deposition.

Q.

Prepare a chart of any 20 compounds and write the molecular formula

Q.

Define one atomic mass unit (a.m.u.).

Q.

Give two examples of the following change occurring during a chemical reaction:

Change of state of the reactants

Q.

What happens when dilute sulfuric acid is poured on zinc granules?

Q.

Write ten balanced chemical equations.

Q.

What is Le Chatelier's principle?

Q. Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

The balanced chemical equation for the following word equation is:

1. ${\text{Ca(OH)}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}\to {\text{CaCO}}_3\text{(aq)}+{\text{H}}_2\text{O}\text{(l)}$
2. ${\text{Ca(OH)}}_2\text{(aq)}+2{\text{CO}}_2\text{(g)}\to 2{\text{CaCO}}_3\text{(aq)}+{\text{H}}_2\text{O(l)}$
3. $2{\text{Ca(OH)}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}\to 2{\text{CaCO}}_3\text{(aq)}+2{\text{H}}_2\text{O(l)}$
4. $2{\text{Ca(OH)}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}\to {\text{CaCO}}_3\text{(aq)}+2{\text{H}}_2\text{O(l)}$

Q.

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test?

Q.

Write the complete balanced equation of $\mathrm{CuO}+{\mathrm{NH}}_3\to \mathrm{Cu}+{\mathrm{N}}_2+{\mathrm{H}}_2\mathrm{O}$ .