[B] Carbon dioxide As we know that when the exhaled air rich in carbon dioxide is blown from mouth into test tube. The lime water turns milky on passing CO₂ gas into it due to formation of insoluble calcium carbonate (CaCO3). As it reacts with lime water (calcium hydroxide - Ca(OH)₂) to produce calcRead more
[B] Carbon dioxide
As we know that when the exhaled air rich in carbon dioxide is blown from mouth into test tube. The lime water turns milky on passing CO₂ gas into it due to formation of insoluble calcium carbonate (CaCO3). As it reacts with lime water (calcium hydroxide – Ca(OH)₂) to produce calcium carbonate and water.
[D] (i) and (iv) Silver and mercury are less reactive than copper and as copper will displace those metals from its salt solution which are less reactive than it.
[D] (i) and (iv)
Silver and mercury are less reactive than copper and as copper will displace those metals from its salt solution which are less reactive than it.
When air is blown from mouth into a test tube containing lime water, the lime water turns milky due to the presence of:
[B] Carbon dioxide As we know that when the exhaled air rich in carbon dioxide is blown from mouth into test tube. The lime water turns milky on passing CO₂ gas into it due to formation of insoluble calcium carbonate (CaCO3). As it reacts with lime water (calcium hydroxide - Ca(OH)₂) to produce calcRead more
[B] Carbon dioxide
See lessAs we know that when the exhaled air rich in carbon dioxide is blown from mouth into test tube. The lime water turns milky on passing CO₂ gas into it due to formation of insoluble calcium carbonate (CaCO3). As it reacts with lime water (calcium hydroxide – Ca(OH)₂) to produce calcium carbonate and water.
Which metal can be displaced by copper from its salt solution?
[D] (i) and (iv) Silver and mercury are less reactive than copper and as copper will displace those metals from its salt solution which are less reactive than it.
[D] (i) and (iv)
See lessSilver and mercury are less reactive than copper and as copper will displace those metals from its salt solution which are less reactive than it.
Galvanization is a method of protecting iron from rusting by coating with a thin layer of
[C] Zinc
[C] Zinc
See lessA teacher sets up the stand carrying a convex lens of focal length 15 cm at 42.7 cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students. As the correct position of the screen was suggested by :
[C] 57.7 cm
[C] 57.7 cm
See less