Haryana Board (HBSE) Class 12 Chemistry SAT-1 Question Paper 2024 PDF Download. SAT (Students Assessment Test). HBSE Class 12 Chemistry SAT Question Paper 2024. Haryana Board Class 12 Chemistry Students Assessment Test 2024. HBSE Class 12th Chemistry SAT 2024 Answer. Haryana Board Class 12 Students Assessment Test. Haryana Board Class 12 Chemistry SAT Paper 2024 Solution. हरियाणा बोर्ड कक्षा 12 रसायन विज्ञान SAT पेपर 2024.
HBSE Class 12 Chemistry SAT-1 Question Paper 2024 Answer Key
Instructions :
• All questions are compulsory.
• Questions (1-9) carry 1 mark each.
• Questions (10-12) carry 2 marks each.
• Questions (13-14) carry 3 marks each.
• Question (15) case study, carry 4 marks.
• Questions (16-17) carry 5 marks each.
1. Standard Electrode Potential for Standard Hydrogen Electrode is?
(a) -0.5 V
(b) +2.0 V
(c) +1.0 V
(d) 0.0 V
Answer – (d) 0.0 V
2. The SI unit of molar conductivity is :
(a) S m2 mol–1
(b) S m2 mol1
(c) S cm2 mol–1
(d) S m3 mol–1
Answer – (a) S m2 mol–1 (Siemen metre square mol inverse)
3. The value of Henry’s constant is :
(a) increases with increase in temperature
(b) decreases with increase in temperature
(c) remains constant
(d) first increases then decreases
Answer – (a) increases with increase in temperature
4. The ore that are concentrated by froth flotation process are :
(a) sulphide
(b) oxides
(c) carbonates
(d) silicates
Answer – (a) sulphide
5. …………. is an ore of Aluminium.
Answer – Bauxite
6. The process of transmitting electric current through an electrolyte’s solution to decompose it is known as ………….
Answer – Electrolysis
7. Which obeys Raoult’s law in all stages of concentration?
Answer – Ideal Solution
8. Name the elements which exhibit both vertical and horizontal similarities?
Answer – Transition elements
9. Assertion (A) : Molality of the solution does not change with change in temperature.
Reason (R) : The molality is expressed as the number of moles per 1000 g of the solvent.
Answer – Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
10. What are the factors affecting rate of reaction?
Answer – Concentration of reactants, pressure in case of gases, temperature, and catalyst.
11. Define Activation Energy
Answer – Activation energy is the minimum amount of energy required for a chemical reaction to occur.
12. Define pseudo first order reaction with example?
Answer – The reaction which is not of first order but behaves like first order is called pseudo first order reaction. eg. hydrolysis of ester.
13. Explain Dry Cell.
Answer – The dry cell convert the stored chemical energy into electrical energy. They undergo reduction-oxidation (Redox) reactions at the cathode and anode. Some dry cells can be recharged while others can be used only once.
14. Time required to decompose thionyl chloride to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.
Answer – Here, Time (t½) = 60 min
t½ = 0.693/k
k = 0.693/t½ = 0.693/60 = 0.11155 min–1
15. CASE STUDY : Transition elements have partly filled d-orbitals in their normal oxidation states or in their common oxidation states. There are four series in transition elements and these are 3d-series (first transition series), 4d-series (second transition series), 5d-series (third transition series) and 6d-series (fourth transition series). Each series contains ten elements. Elements of group 12 are not considered as transition elements as these have fully-filled d-subshells. Transition elements show all the characteristics of metals. These elements show variable oxidation states, form coloured ions, form complexes from alloys and interstitial compounds. They show high enthalpies of atomisation, show catalytic properties and magnetic moment.
Questions :
(a) Why Zn, Cd and Hg are not considered as transition elements?
Answer – Transition metals are defined as the elements having incompletely filled d-orbitals. Since Zn, Cd and Hg have completely filled d-orbital, they are not regarded as transition elements.
(b) Which element of d-block shows maximum oxidation state?
Answer – Manganese
(c) Why transition elements show variable oxidation states?
Answer – Transition elements show variable state oxidation in their compounds because there is a very small energy difference between (n-1)d and ns orbitals. As a result, electrons of (n-1)d orbitals as well as ns-orbitals take part in bond formation. Thus, transition elements have variable oxidation states.
(d) Calculate the magnetic moment of a divalent ion in its aqueous solution if its atomic number is 25.
Answer : Magnetic moment (µ) = √n(n+2)
= √5(5+2) = √35 = 5.92 BM
16. Difference between Ideal solution and Non-Ideal solution.
Answer: Ideal Solution – An ideal solution follows Raoult’s Law perfectly. This means that the partial vapour pressure of each component is directly proportional to its mole fraction in the solution.
• Non-Ideal Solution – A non-ideal solution does not follow Raoult’s Law perfectly, usually due to significant differences in intermolecular forces between the different components.
17. What is the difference between a primary and secondary battery?
Answer : Primary Battery – Primary batteries are non-rechargeable batteries that generate electrical energy through chemical reactions. Once the reactants are depleted, they cannot be recharged or reused.
• Secondary Battery – Secondary batteries are rechargeable batteries that can store and release electrical energy multiple times.