General Chemistry

286 Which of the toxic heavy metals is found in modern tannery industries ?

287 Raw materials used for the manufacture of glass are

288 Cement is usually a mixture of :

289 Sea weeds are important source of :

290 The basic chemical building block of natural rubber obtained from trees is :

291 Which metal does not undergo corrosion due to the formation of oxide layer?

292 Submarines move under water. They have engines that run on :

293 Molasses a by-product in the manufacture of sugar, is converted into :

294 When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is :

295 In the electroplating of gold, the electrolyte used is :

296 The coloured discharge tubes for advertisement mainly contain :

297 The natural resource, known as black gold is :

298 Which of the following is a renewable source of energy ?

299 Dry ice is :

300 Rock salt is a mineral containing