A food label is given below. E304 and E307b are added to the flavoured biscuits. Which of the following is added to food packets for the same reason?A. saltB. vinegarC. nitrogenD. vanilla
A food label is given below. E304 and E307b are added to the flavoured biscuits. Read More »
The unsaturated hydrocarbon with three carbon atoms is: A. propene B. propane C. pentane D. pentene
The unsaturated hydrocarbon with three carbon atoms is: Read More »
Which of the following pair of compounds are isomers? A. B. C. D.
Which of the following pair of compounds are isomers? Read More »
Which of the following salts contain water of crystallisation: (i) Plaster of Paris, (ii) Washing soda, (iii) Baking soda and (iv) Gypsum. A. (i), (ii) and (iii)B. (i), (iii) and (iv)C. (ii), (iii) and (iv)D. (i), (ii) and (iv)
Which of the following salts contain water of crystallisation: Read More »
Manjeet wants to wash clothes, but the water available is hard. He compares the action of soap and detergent in hard water, to decide which one to use for washing his clothes. He observes: Soap forms scum in hard water. Detergent produces lather easily in hard water. Which of the following inferences is correct? A.
Rishita summarizes the chlor-alkali process in the following table. Option Product Formed Use I Hydrogen At cathode Used as a fuel II Chlorine At anode Used to make margarines III Sodium Hydroxide Near cathode To make soap IV Sodium Hydroxide Near anode To make bleachingpowder Identify the options that are correctly matched. A. I, II
Rishita summarizes the chlor-alkali process in the following table. Read More »
Chameleons contain crystals that reflect light and produce colour. Adjusting the spacing between these crystals, they can alter the wavelengths of light reflected, thus changing their skin colour. Based on the above information, we can infer that the change in colour by chameleons is a: A. chemical change because change in colour takes place.B. chemical
If diffusion were to move oxygen in our body, it is estimated that it would take 3 years for a molecule of oxygen to get to our toes from our lungs then, how is oxygen delivered to all parts of our body?
Describe the process of inhalation and also mention how are the lungs designed in human beings to maximise the area for exchange of gases?
How many chambers are present in the heart of fishes, how does circulation of blood take place in them?