The position of equilibrium in a reversible reaction is affected by
particle size of the reactants
vigorous stirring of the reaction mixture
presence of a catalyst
change in concentration of the reactants
Correct answer is D
The position of equilibrium will shift under the effects of changes in temperature, pressure and concentration.
The following factors would contribute to environmental pollution except
production of ammonia
manufacture of cement
photosynthesis
combustion
Correct answer is C
Photosynthesis is the process of food-making in plants, it doesn't have any by-products that pose a threat to the environment. Infact, the plants use our waste product of respiration (Carbon dioxide) and uses it for the photosynthetic process and gives off oxygen as by-product.
The most suitable substance for putting out petrol fire is
water
carbon(IV) oxide
fire blanket
sand
Correct answer is B
In order to extinguish a petrol fire, you have to cut off the oxygen. This can be done by using carbon dioxide gas to dilute the oxygen available and stop the burning.
Stainless steel is an alloy comprising of
Fe and C
Fe and Ni
Fe, C and Ni
Fe, C and Al
Correct answer is C
Stainless steel comprises iron (Fe), chromium (Cr), manganese (Mn), silicon (Si), carbon (C) and, in many cases, significant amounts of nickel (Ni) and molybdenum (Mo).
The valence electrons of \(_{12}Mg\) are in the
3s orbital
2p\(_{x}\)
2s orbital
1s orbital
Correct answer is A
\(_{12}Mg = 2, 8, 2\)
\(= 1s^{2} 2s^{2} 2p^{6} 3s^{2}\)