A. Ca
B. Cu
C. AI
D. Fe
The chemical formula of feldspar is
The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is<br>
The following are some statements related to VA group hydrides,<br>I . Reducing property increases from NH<sub>3</sub> to BiH<sub>3</sub>.<br>II..Tendency to donate lone pair decreases from NH<sub>3</sub> to BiH<sub>3</sub><br>III.Thermal stability of hydrides decreases from NH3 to BiH3.<br>IV. Bond angle of hydrides decreases from NH<sub>3</sub> to BiH<sub>3</sub>.<br>The correct statements are<br>
Which one of the following noble gases is used in miner's cap lamps
Which of the following is not a peroxy acid
Calorific value of producer gas is low because of
Which of the following is used for making optical instruments ?
CFCl<sub>3</sub> is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen ?
What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?
Observe the following statements :<br><br>I. Bleaching powder is used in the preparation of chloroform.<br>II. Bleaching powder decomposes in the presence ofCoCl2 to liberate 02.<br>III.Aqueous KHF<sub>2</sub> is used in the preparation of fluorine.<br>The correct combination is :