An increase in temperature increases which of the following?
1 . The rate constant of a reaction
2 . The ionic product of water
3 . The equilibrium constant of an exothermic reaction.
Select the correct answer using the code given below.
(A) 1 and 2 only
(B) 2 and 3 only
(C) 1 and 3 only
(D) All of the above
When two plates of different metals are placed in an electrolyte, the developed emf between them depends on
(A) the type of electrolyte
(B) distance between the plates
(C) position of the two metals in the electrochemical series.
(D) All of the above
All the elements in a group in the Periodic Table have the same
(A) atomic weight
(B) number of valence electrons
(C) atomic number
(D) None of the above
Which one of the following consists only the ores of magnesium?
(A) Magnesite, carnallite, cassiterite, dolomite, epsom salt
(B) Magnesite, carnailite, dolomite, kieserite, epsom salt
(C) Magnesite, carnallite, dolomite, galena, malachite
(D) Magnesite, cassiterite, kieserite, galena, malachite
Which one among the following metals is used for making boats because it does not corrode by sea water?
Consider the following statements
1 . Pig iron is obtained from the bottom of blast furnace in the metallurgy of iron.
2 . Pig iron contains approximately 3%carbon.
Which of the statements given above is/are correct?
(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2
If a refrigerator’s door is kept open, then
(A) Room will be cooled
(B) Room will be heated
(C) Room may get cooled or heated depending upon the weather
(D) No effect
The conduction of electricity through the electrolyte solution is due to
(A) movement of molecule of electrolyte
(B) movement of ions of electrolyte
(C) movement of separate atom
(D) movement of particles of the solvent
MatchColumn I and Column II .
Column I- Column II
A . Elements in group I A 1 . Inert gas
B . Elements in group zero 2 . Alkali metal
C . Elements of d-block 3 . Inner-transition element
D . Elements of f-block 4 . Transition element
(A) 2 1 4 3
(B) 1 4 3 2
(C) 4 3 2 1
(D) 3 2 1 4
Consider the following statements Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is
1 . act as a reducing agent.
2 . remove silica associated with the iron ore.
3 . function as fuel, to supply heat.
4 . act as an oxidizing agent.
Of these statements
(A) and 2 are correct
(B) 2 and 4 are correct
(C) and 3 are correct
(D) 3 and 4 are correct
Which of the following is a true statement regarding calcinations?
(A) The ore is heated strongly in the absence of any blast of air
(B) The ore is heated with calcium
(C) The ore is heated with carbon
(D) The mineral is melted with limestone
German silver is an alloy of
(A) gold and silver
(B) copper and silver
(C) copper, zinc and silver
(D) copper, zinc and nickel
A fan produces a feeling of comfort during hot weather, because
(A) our body-radiates more heat in air
(B) fan supplies cool air
(C) conductivity of air increases
(D) our perspiration evaporates rapidly
Consider the following statements regarding a motor car battery.
1 . The voltage is usually 12 V.
2 . Electrolyte used is hydrochloric acid.
3 . Electrodes are lead and copper.
4 . Capacity is expressed in ampere-hour.
Which of the above statement are correct?
(A) 1 and 2
(B) 2 and 3
(C) 3 and 4
(D) 1 and 4
Which one of the following properties changes with Valency?
(A) Atomic weight
(B) Equivalent weight
(C) Molecular weight
Neutral refractory material used in furnace is
Why are stainless steel cooking pans fabricated with copper bottom?
(A) Copper is cheaper
(B) Conductivities of copper is more than the stainless steel
(C) Copper increases durability of the cooking pan
(D) Copper is a good reflector of heat