Which two elements among the following …

Which two elements among the following belong to the same period Al, Si, Ba and O? 2. Why liquids diffuse slowly as compared to gases? 3. A gas is filled into a bulb connected to an open limb manometer. The level of mercury in the open arm is 2.1 cm lower than that in the other arm of manometer. The atmospheric pressure is 720 mm. What is the pressure of the gas? 4. Heat capacity is an extensive property but specific heat is intensive property. Comment on the statement. 5. Boron forms no compounds in unipositive state but thallium in unipositive state is quite stable. Explain. Section B 6. Cyanogen is known as a pseudohalogen because it has some properties similar to halogens. It is composed of two CN's joined together. Do the two CN's join through the carbon or the nitrogen (i. e., C – N –N – C or N – C – C – N)? 7. is heavier than and gases present in the air but it does not form the lower layer of the atmosphere. Explain. 8. Calculate (i) mass of 2.5 g atoms of magnesium, (ii) gram atom in 1.4 g of nitrogen (Atomic mass Mg = 24, N = 14)

25 chemical compounds with chemical formula

What are all the formulas used in chapter basic concepts of chemistry

Calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.41gml-1. And the mass percent of nitric acid in it being 69%

A mixture of 24~dm^{3} of hydrogen and 100~dm^{3} of oxygen was ignited and the reaction mixture was cooled to room temperature and pressure. What will be volume of gases remaining of the end of the reaction?

74 g of calcium hydroxide Ca(OH)2 in 1 liter

An organic compound contain 16.27 carbon, 0.677 hydrogen and 72.2% chlorine and it's MM is 147.5 amu. Find it's molecular formula

Calculate the number of atoms of each type in 3.4 to ML of nitrogen gas at standard temperature and pressure??

What is the no. Of moles find in 90 g of H20

How to calculate na2so4 mass percent with step by step

The uncertainty in position and velocity 10-¹⁰ and 5.27×10-²⁴m/srespectively calculate the mass of the particle.