Question:- Carbon, diamond and graphite are together called A. allotropes B. isomers C. isomorphs D. isotopes
Answer:- Option A
Question:- Permanent hardness of water may be removed by the addition of A. sodium carbonate B. alum C. potassium permanganate D. lime
Answer:- Option A
Question:- Soda water contains A. carbonic acid B. sulphuric acid C. carbon dioxide D. nitrous acid
Answer:- Option C
Question:- The most important ore of aluminium is A. galena B. calamine C. calcite D. bauxite
Answer:- Option D
Question:- Which of the following was to be discovered first in the chromospheres of the sun? A. Krypton B. Xenon C. Neon D. Helium
Answer:- Option D
Question:- Which of the following is in liquid form at room temperature? A. Lithium B. Sodium C. Francium D. Cerium
Answer:- Option C