Question 261 On contact with oxygen, Rubidium forms ? A) normal oxide B) per oxide C) super oxide D) none of above No Details
Question 262 Metals difficult to oxidize are called ? A) weak metals B) strong metals C) noble metals D) none of above No Details
Question 264 Copper deficiency causes ? A) Anaemia and damages to CNS B) Pellagra C) Xerophthalmia D) Influenza No Details
Question 266 Which of the following is not a type of element ? A) Metals B) Non- metals C) Gases D) Metalloids No Details
Question 267 Which of the following is also known as Laughing gas ? A) Nitric oxide B) Nitrous oxide C) Nitrogen penta oxide D) Nitrogen No Details
Question 268 The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is ? A) 22 B) 2 C) 38 D) 20 No Details
Question 269 Who is regarded as father of modern chemistry? A) Rutherford B) Einstein C) Lavoisier D) C V Raman No Details
Question 270 Adding common salt to distilled water makes it? A) Good conductor B) Insulator C) No D) Both a and b No Details