ISC Specimen Class 10 Chemistry Sample Paper 2024 Solution
ISC Board Class 10 Chemistry Sample Paper 2024 Solution www.cisce.org. New Sample Paper Solution ISC Board 2024 Chemistry all Question Answers by Expert Teachers. Students of Class XII who are preparing for Board Exam 2024 can solved here Chemistry Sample Paper.
Question 1 :
(A) Fill in the blanks by choosing the appropriate word(s) from those given in thebrackets:
[ decreases, CNion, activation energy, catalyst, two, Fe2+ ion, carbon, latticeenergy, enzyme, five, double, halogen, triple, increases]
(i) In the Haber process, iron changes the _______ of reaction whilemolybdenum increases the efficiency of the _________.
(ii) The number of ions that will be produced when potassium ferrocyanide,K4[Fe(CN)6], dissolves in water is _________. This shows that__________ is the ligand in the coordination compound.
(iii) Haloalkenes undergo both nucleophilic and electrophilic reactions due tothe presence of __________bond and the __________ atom.
(iv) In case of alcohols, as the carbon chain length increases, the boilingpoint ____________ and the solubility in water____________.
Answer :
(i) rate, catalyst
(ii) five, CN– ion k4[Fc(CN)6]
(iii) double, halogen
(iv) Increase, decrease
(B) Select and write the correct alternative from the choices given below:
(i) A potassium iodide (KI) solution containing starch turns blue on theaddition of chlorine. Which one of the following statements explain this?
(P) The reduction potential of Cl2 is more than that of I2.
(Q) The oxidation potential of Cl2 is more than that of I2.
(R) The product formed when Cl2 combines with starch is blue.
(S) The product formed when I2 combines with starch is blue.
(a) Only P and R
(b) Only Q and R
(c) Only Q and S
(d) Only P and S
Answer :
(d) Only P and S
(ii) Crystal field splitting energy (CFSE) for high spin d4octahedral complexis:
(a) -1·6 ∆o
(b) -1·2 ∆o
(c) -0·8 ∆o
(d) -0·6 ∆o
Answer :
(d) -0·6 ∆o
(iii) Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. Thisis due to formation of:
(a) CrO42-
(b) Cr2(SO3)3
(c) Cr2O3
(d) Cr2(SO4)3
Answer :
(d) Cr2(SO4)3
K2CR7 + 3H2SO4 + 3Na2SO3 → Cr2(SO4)3 + K2SO4 + 3Na2SO4 + 4H20
(iv) Which of the following product is formed when benzene diazoniumchloride is reduced by hypophosphorous acid (H3PO2) in the presence ofcuprous ion as catalyst?
(a) Phenol
(b) Aniline
(c) Benzene
(d) Benzene cyanide
Answer :
(c) Benzene
(v) Which of the following aqueous solution has lowest vapour pressure?
(a) 1M NaCl
(b) 1M K2SO4
(c) 1M Glucose
(d) 1M Sucrose
Answer :
(b) 1M K2SO4
(vi) Assertion: Adding water to two beakers ‘A’ and ‘B’ containing NaOHand CH3COOH solutions respectively will increase the molarconductance (ꓥm) of the solutions sharply in beaker ‘A’ andslowly in beaker ‘B’.
Reason: Molar conductance (ꓥm) increases with a decrease inconcentration or upon dilution.
(a) Both Assertion and Reason are true and Reason is the correctexplanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correctexplanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer :
(b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
(vii) Assertion: Aniline is soluble in HCl while it is only slightly soluble inwater.
Reason: Aniline cannot make hydrogen bonds with water but getsprotonated easily by acids.
(a) Both Assertion and Reason are true and Reason is the correctexplanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correctexplanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer :
(a) Both Assertion and Reason are true and Reason is the correctexplanation of Assertion.
(C) Read the passage given below carefully and answer the questions that follow.
During the winter season in a particular year, Kashmir experienced heavysnowfall. It was an unexpected snowfall. Thousands of visitors were strandedbecause it was dangerous to travel on snowy roads and vehicles could not moveas water froze in the car radiators. In such conditions officials decided to sprinklerock salt or CaCl2 on roads.
(i) Why was it decided to sprinkle rock salt or CaCl2 on the roads?
(ii) A mixture of ethylene glycol and water is used as coolant in car radiators.Why?
(iii) How many grams of ethylene glycol (mol. wt. = 62 g mol-1) should be added to 10 kg of water so that the solution freezes at -10oC?(Kf for water = 1ˑ86 K kg mol-1)
Answer :
(i) Much lower freezing point of which is more effective at melting ICE.
(ii) Lowery the freezing point of water and used to cool the engine of car.
(iii) mm = 62 pg Mol-1
ω = 10 kg = 10000 g
Kf = 1.86 kg mol-1
△Tf = 0° – (-10°)
= 10°C
△Tf = Kf×ω× 1000/mm × W
10 = 1.86 × ω × 1000/62 × 10000
ω = 620000/1.66
= 33333 g
= 3.33 kg