121. Isotopes of Hydrogen are?
A) 1
B) 2
C) 3
D) 4
122. One AMU (atomic mass unit) is equal to?
A) 1.66×10^-24mg
B) 1.66×10^-24g
C) 1.66×10^-23g
D) 1.66×10^-24kg
123. The most abundant element occurring in the earth’s crust by weight is?
A) Silicon
B) Oxygen
C) Aluminium
D) Iron
124. Which metal is more malleable?
A) Gold
B) Sodium
C) Iron
D) Silver
125. Which of the following favors the reverse reaction in the chemical equilibrium?
A) Increasing the concentration of the reactant
B) Expulsion of the most un-one of the items at customary spans
C) Increasing the concentration of at least one of the products
D) None of them
126. A chemical reaction is in equilibrium when:
A) Formation of the product is minimum
B) Reactants are completely transformed into products
C) Rates of forward and reverse reactions are equal
D) None of them
127. Under what conditions of temperature and pressure will the formation of atomic hydrogen from molecular hydrogen be favored?
A) High temperature and high pressure
B) Low temperature and low pressure
C) High temperature and low pressure
D) None of them
128. In a lime kiln, to get a higher yield of CO2, the measure that can be taken is:
A) To maintain high temperature
B) To pump out CO2
C) To remove CaO
D) To add more CaCO3
129. When the rate of formation of reactants is equal to the rate of formation of products, this is known as:
A) Chemical reaction
B) Chemical equilibrium
C) Chemical kinetics
D) None
130. Which of the following is a characteristic of a reversible reaction?
A) It never proceeds to completion
B) It can be influenced by a catalyst
C) It only moves in the opposite direction
D) Number of moles of reactants and products are equal
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