Q. Detect the odd one -
1) Setting of cement
2) Burning of coal
3) Ripening of fruit
4) None of the above
Q. Why does dry HCl gas not change the color of dry litmus paper?
1) Blue litmus becomes dry in the presence of dry HCl gas
2) No H3O+ ions are present. Litmus changes colour only in the presence of H3O+ ions
3) HCI gas acts as a dehydrating agent
4) None of the above
Q. The odour of acetic acid resembles that of -
1) tomato
2) kerosene
3) vinegar
4) None of the above
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. Which of them will turn red litmus to blue?
1) Acid
2) Base
3) Distilled water
4) None of the above
Q. Which acid is described as HOOC COOH?
1) Oxalic acid
2) Acetic acid
3) Carbonic acid
4) None of the above
Q. Acids react with metal carbonates to liberate ____________ gas.
1) CO2
2) CO
3) H2
4) None of the above
Q. Some metal oxides react with acid as well as a base to produce salt and water. They are known as amphoteric oxides. Examples of amphoteric oxides are -
1) Al2O3 and ZnO
2) Al2O3 and CuO
3) CuO and ZnO
4) None of the above
Q. A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is -
1) krypton
2) kerosene
3) carbon steel
4) None of the above
Q. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he/she is adjusting -
1) amplitude of sound
2) intensity of sound
3) frequency of the sitar string with the frequency of other musical instruments
4) None of the above
Q. A bus is moving along a straight path and takes a sharp turn to the right side suddenly. The passengers sitting in the bus will -
1) fall in the forward direction
2) bent towards the left side
3) bent towards the right side
4) None of the above
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