Chemistry Class 10th MCQs

Which one of the following statements is false about dynamic equilibrium:

1. It takes place in a close container
2. Concentration of reactant and products are not changed
3. Rate of forward reaction is equal to rate of reverse reaction
4. Equilibrium cannot be disturbed by any external stress

Ozone is a gas found in the layer:

1. Troposphere
2. Mesosphere
3. Stratosphere
4. Exosphere

Which of the following water borne diseases is of viral origin:

1. Typhoid fever
2. Polio
3. Dysentery
4. Diarrhea

How much percentage (%) of the Earth's Surface is covered with water:

1. 70%
2. 60%
3. 90%
4. 75%

Which type of bond is formed between H₂O molecules:

1. Hydrogen bond
2. Ionic bond
3. Covalent bond
4. All of these

The permanent hardness of water is due to presence:

1. MgSO4
2. Mg(HCO3)₂
3. CA(HCO3)2
4. All of these

Which salts are excessively dissolved to make temporary hard water:

1. CaSO4 and CaCl2
2. KNO3 and KOH
3. CaCO3 and Ca(OH)2
4. Ca(HCO3)2 and Mg(HCO3)2

Water is a:

1. Polar solvent
2. Non-polar solvent
3. Amphiphatic solvent
4. Non-polar charged solvent

The taste of water is:

1. Sour
2. Bitter
3. Sweet
4. Tasteless

Which of the following is helpful for removal of permanent hardness:

1. Na2CO3
2. Ca(OH)2
3. CaCO2
4. Na2SO4

The Analytical Chemistry deals with instruments and methods to ___identify and quantify the matter:

1. Mix
2. Separate
3. Differentiate
4. Manipulate