Which of the following alkali metals has highest specific heat?
1). Cesium
2). Rubidium
3). Potassium
4). lithium
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1. Neoprene is prepared by polymerisation of which of the following
2. When cathode rays strike a target of high atomic weight, they give rise to
3. Benzene is ______ in ethyl alcohol.
5. Which variety of coal contains recognizable traces of the original plant material ?
6. The temperature of oxy-acetylene flame is around
8. Vinegar is