Profile nitride on reaction with sodium in the presence of ethanol
Answers
Answer:
) State the conditions required for the following reactions to take place:
(i) Catalytic hydrogenation of ethyne.
(ii) Preparation of ethyne from ethylene dibromide.
(iii) Catalytic oxidation of ammonia to nitric oxide.
(iv) Any two conditions for the conversion of sulphur dioxide to sulphur trioxide.
(b) State the main components of the following alloys:
(i) Brass.
(ii) Duralumin.
(iii) Bronze.
(c) Give balanced equations for the following:
(i) Laboratory preparation of nitric acid.
(ii) Preparation of ethanol from monochloroethane and aq. sodium hydroxide.
[5+3+2 = 10]
Marks:10
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Q2
(a) Give the structural formula of the following:
(i) Ethanol.
(ii) 1-Propanal.
(iii) Ethanoic acid.
(iv) 1, 2- Dichloroethane.
(b) Draw the structure of the stable positive ion formed when an acid dissolves in water.
(c) State the inference drawn from the following observations:
(i) On carrying out the flame test with a salt P a brick red flame was obtained. What is the cation in P?
(ii) A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.
(iii) pH of liquid R is 10. What kind of substance is R?
(iv) Salt S is prepared by reacting dilute sulphuric acid with copper oxide. Identify S.
[4+2+4 = 10]
Marks:10
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Q3
(a) (i) State Avogadro’s Law.
(ii) A cylinder contains 68 g of ammonia gas at STP
(1) What is the volume occupied by this gas?
(2) How many moles of ammonia are present in the cylinder?
(3) How many molecules of ammonia are present in the cylinder? [N-14, H-1]
(b)(i) Why do covalent compounds exist as gases, liquids or soft solids?
(ii) Which electrode: anode or cathode is the oxidising electrode? Why?
(c) Name the kind of particles present in:
(i) Sodium Hydroxide solution
(ii) Carbonic acid
(iii) Sugar solution [4+3+3 = 10]
Marks:10
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Q4
(a) An element Z has atomic number 16. Answer the following questions on Z
(i) State the period and group to which Z belongs
(ii) Is Z a metal or a non-metal?
(iii) State the formula between Z and Hydrogen
(iv) what kind of a compound is this?
(b)M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide, which is a good conductor of electricity. In the above context, answer the following:
(i) What kind of combination exists between M and O?
(ii) How many electrons are there in the outermost shell of M?
(iii) Name the group to which M belongs.
(iv) State the reaction taking place at the cathode.
(v) Name the product at the anode.
Marks:10 View Answer
Q5
(a) Name the following:
(i) The property possessed by metals by which they can be beaten into sheets.
(ii) A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminum.
(iii) The ore of zinc containing its sulphide.
(b) Give one equation each to show the following properties of sulphuric acid:
(i) Dehydrating property
(ii) Acidic nature
(iii) As a non-volatile acid
(c) Give balanced chemical equations to prepare the following salts:
(i) Lead sulphate from lead carbonate
(ii) Sodium sulphate using dilute sulphuric acid
(iii) Copper chloride using copper carbonate [3+3+4 = 10]
Marks:10 View Answer
Q6
(a) State your observation in each of the following cases:
(i) When dilute hydrochloric acid is added to sodium carbonate crystals.
(ii) When excess sodium hydroxide is added to calcium nitrate solution.
(iii) At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.
(iv) When calcium hydroxide is heated with ammonium chloride crystals.
(v) When moist starch iodide paper is introduced into chlorine gas.
(b) Study the figure given below and answer the questions that follow:
(i) Identify the gas Y.
(ii) What property of gas Y does this experiment demonstrate?
(iii) Name another gas, which has the same property and can be demonstrated through this experiment.
(c) (i) Name the other ion formed when ammonia dissolves in water.
(ii) Give one test that can be used to detect the presence of the ion produced.
Marks:10 View Answer
Q7
Question 1
(a) Choose the correct answer from the options given below:
(i) Ionisation potential increases over a period from left to right because the:
(A) Atomic radius increases and nuclear charge increases
(B) Atomic radius decreases and nuclear charge decreases
(C) Atomic radius increases and nuclear charge decreases
(D) Atomic radius decreases and nuclear charge increases
(ii) A compound X consists of only molecules. Hence, X will have:
(A) A crystalline hard structure
(B) A low melting point and low boiling point
(C) An ionic bond
(D) A strong force of attraction between its molecules.
(iii) When fused lead bromide is electrolysed we observe:
(A) a silver grey deposit at anode and a reddish brown deposit at cathode
(B) a silver grey deposit at cathode and a reddish brown deposit at anode
(C) a silver grey deposit at cathode and reddish brown fumes at anode
(D) silver grey fumes at anode and reddish brown fumes at cathode
(iv)