Online Science Quiz | Chemistry Quiz Questions Chemical Equilibrium

1) The steady state from which no spontaneous change takes place is called what?

Answer: Equilibrium.

2) What is the color of ammonium chloride?

Answer: White.

3) The chemical reactions which never go to completion are called what?

Answer: Reversible reactions.

4) In the manufacture of ammonia from hydrogen and nitrogen the pressure used is.

Answer: Very high.

5) The process of manufacture of Sulfuric acid is named as what?

Answer: Contact process.

6) What is the color of ferric thiocyanate?

Answer: Deep red or blood red.

7) What is known as a system of reacting substances in which the concentrations of reactants and product do not undergo any change?

Answer: Chemical equilibrium.

8) What is dissociation?

Answer: Reversible decomposition is called dissociation.

9) What is the color of Phenolphthalein in sodium hydroxide solution?

Answer: Pink.

10) Which substance obtained on cooling the vapor produced on heating ammonium chloride?

Answer: Ammonium chloride.

11) When temperature is decreased the speed of the reaction increases. Which was the action?

Answer: Exothermic.

12) Write an example of an irreversible reaction.

Answer: The neutralization of sodium hydroxide with hydrochloric acid.

13) A factor which is unable to alter the equilibrium state of reactions in which only solids or liquids are present is?

Answer: Pressure.

14) Chemical equilibrium is said to be dynamic in nature. Why?

Answer: Because even after reaching equilibrium forward and backward reactions are taking place at the same rate.

15) What must be constant for the system to reach equilibrium?

Answer: Temperature.

16) What do you understand by chemical equilibrium?

Answer: The stat of a system of reacting substances in which the concentration does not change is called chemical equilibrium.

17) What are the factors affecting the chemical equilibrium?

Answer: The changes in the concentration, temperature, or pressure affect the equilibrium.

18) Name the reactant used in excess in contact process?

Answer: Air.

19) What is the pressure used in the manufacture of ammonia?

Answer: 1000 atmospheres.

20) What is the optimum temperature in the manufacture of ammonia?

Answer: 500° C.

21) Name the scientist who described about reactions that go forward and backward.

Answer: Berthollet.

22) What is the color of solution obtained when hydrolysis of ferric chloride takes place?

Answer: Chocolate.

23) What is the name of process used for manufacturing ammonia direct from Nitrogen and hydrogen elements?

Answer: Haber process.

24) What accelerate the forward and backward reactions equally in a reversible reaction?

Answer: Catalyst.

25) What happens if a reversible reaction continues for a long time as a closed system?

Answer: Both the reactions continue at the same speed.

Chemistry Online GK Quiz with Answers – Chemistry General Science Quiz Questions

26) Which is the most suitable temperature for the production of sulfur trioxide from sulfur dioxide and oxygen?

Answer: 450° C.

27) What happens if a reversible reaction is allowed to continue uninterrupted?

Answer: It will finally reach a stage at which the concentrations of reactants and products remain without any change.

28) What happened if the concentration of the reactants is increased in a reversible reaction?

Answer: Concentration of the product increases.

29) Who put forward a principle relating to the equilibrium system?

Answer: Le Chatelier.

30) How is Le Chatelier principle useful to us?

Answer: It helps us to infer the effect of the change of concentration, pressure, or temperature on an equilibrium system.

31) The reaction in which the forward and backward reactions occur simultaneously  is called what?

Answer: Reversible reaction.

32) A substance which sublimes is what?

Answer: Ammonium chloride.

33) What do we get on oxidizing sulfur dioxide?

Answer: Sulfur trioxide.

34) What happened when the pressure of a gas is increased?

Answer: Its concentration is also increases.

35) What is the molecular formula of ammonia?

Answer: NH3.

36) Write an example of an alkali:

Answer: NaOH.

37). Which energy is possessed by the activated complex?

Answer: Potential energy.

38) Write an example for one-way reaction:

Answer: Burning of magnesium.

39) Which substance (in white colour) seen on the inner side of the test tube near its mouth when ammonium chloride heated in it?

Answer: Ammonium chloride.

40) Those reactions in which the products cannot react and give back original reactants are called what?

Answer: Irreversible reactions.

41) What is the name of chemical with formula KCNS?

Answer: Potassium Thio Cynate.

42) The temperature most suited for conducting an industrial process involving a reversible reactions; most conveniently and profitably is called what?

Answer: Optimum temperature.

43) The reaction in which product molecules react and give back original reactants is called what?

Answer: Backward reactions.

44) A system of reacting substances from which neither the reactants nor the products are taken away or added to is called what?

Answer: Closed system.


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