CUET Exam Chemistry Previous Year Questions Set 1

(i) Silicon doped with electron elements of group-13 forms.
1. Conductor
2. Intrinsic semiconductor
3. p-type semi conductor
4. n-type semi conductor

Solution

(ii) Atoms of element B form hep lattice and those of the element A occupy 2nd/3 of octahedral voids. What is the formula of the compound formed by the element A and B?
1.A₃B₄
2.A₄B₃
3.AB
4.A₄B

Solution

(iii) Which of the following is more reliable ?
1. % (w/v)
2. Molarity (M)
3. Molality (m)
4. Strength (S)

Solution

(iv) Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.
1. 36.95g
2. 37.5g
3. 39g
4. 35.95g

Solution

(v)

Solution

(vi)Decreasing order of reducing power of the given species as per their standard reduction potential is:
A.-2.36
B. +0.54
C.+1.23
D.-0.74
E. +1.81
Choose the correct answer from the options given below:
1. A>D>E>B>C
2. A>D>B>C>E
3. EC>A>B>D
4. E>C>B>D>A

Solution

(vii) A solution of CuSO₄ is electrolysed for 10 min with a current of 1.5 A. What is the mass of copper deposited at the cathode (molar mass of Cu=63g) (1F = 96487c).
1. 2.93 g
2. 3.4 g
3. 1.9 g
4. 0.2938 g

Solution

(viii) For the cell: Ni (s) | Ni2+ (0.1M) || Cu2+ 2+ (0.1M) | Cu(s) the cell potential will increase when,
1. Ni2+ ion concentration is increased
2. Cu2+ ion concentration is decreased
3. Cu2+ ion concentration is increased
4. Temperature of the cell is decreased

Solution

(ix) A first order reaction is found to have a rate constant, k = 5.5 * 10 ^ - 14 * s ^ -1 Find the half life of the reaction.
1. t_1/2 = 0.693s
2.t_1/2=55*10^13 s
3.t_1/2=2.303*10^13s
4.t_1/6=1.26*10^13*s

Solution

(x) In the below given hypothetical equation r = k[A] [B] If the concentration of [B] is kept constant and concentration of [A] is increased to 3 times, the reaction rate increases 27 times, then the order of reaction with respect to A is:
1.3
2.2
3.1
4.0

Solution

(xi) A graph is plotted between Ink and 1/T, what is the value of slope?
1. Slope = Ea/ R
2. Slope = -Ea/R
3.Slope =k/R
4. Slope = -k/R

Solution

(xii) Ore of copper is:
1. Malachite
2. Magnetite
3. Cryolite
4. Calamine

Solution

(xiii) Zone refining is based on the principle that
1. Impurities of low boiling point metals can be separated by distillation
2. Impurities are more soluble in molten metal than in solid metal
3. Vapours of volatile compounds can be decomposed to give pure metal
4. Different component can be absorbed differently on a adsorbant

Solution

(xiv) The strongest oxidising and reducing agents respectively are.
1.F₂ and I^-
2. Br₂ and Cl^-
3.Cl₂and Br^-
4.Cl₂and I₂

Solution

(xv) What is basicity of H3PO4
1. 1
2. 2
3. 3
4. 5

Solution

(xvi) Identify the correct statement(s).
A. Fluorine is a stronger oxidising agent than chlorine.
B. Sulphur in vapour state shows paramagnetic behavior.
C. H2S is more acidic than H2Te.
D. Fluorine form two oxoacids HOF, HOFO.
Choose the correct answer from the options given below:
1. A and B only
2.B and C only
3.A,B, C,D only
4. A and C only

Solution

(xvii) Which is best description of behavior of bromine in the reaction given below?
H20 + Br2 —> HBr +HOBr
1. Proton accepted only
2. Both oxidised and Reduced
3. Oxidised only
4. Reduced only

Solution

(xviii) Which of the following ionic species has the greatest proton affinity to form stable compound?
1. HS^-
2. NH₂^-
3. F^-
4. I^-

Solution

(xix) Which one of the following characteristics of the transition metals is associated with their catalytic property/activity?
1. colour of hydrated ion
2. variable oxidation states
3. high enthalpy of atomisation
4. paramagnetic behaviour

Solution

(xx) The aqueous solution containing which one of the following ions will be colourless (Atomic number of Sc=21, Fe = 26, Ti = 22, Mn = 25)
1. Sc³⁺
2. Fe²⁺
3. Ti³⁺
4. Mn²⁺

Solution

(xxi) Which of the complexes give white ppt when treated with aqueous solution of BaCl2?
A. [Co(NH3)5S04]CI
B. [Co(NH3)3CI]1S04
C. [Co(NH3)5 (NO2)](NO2)2
D. [Co(NH3)5 CN] SO4
Choose the correct answer from the options given below:
1. B, C only
2.B.D only
3. A, C only
4.A,C, D only

Solution

(xxii) The i
ncreasing order of magnetic behaviour for following complex is A. [Ti(H20)6]3+
B. [V(H20)6]3+
C. [MnCl4]2-
D. [MnF6]3-
E. [Cr(H20)6]3+
Choose the correct answer from the options given below:
1. A< B< C< D< E
2. E< D< C< B< A
3. D< A< B< C< E
4. A< B< E< D< C

Solution

(xxiii) Grignard reagent should be prepared under anhydrous condition because
1. carbon Mg bond is not highly polar
2. Mg-X bond is essentially covalent
3. It reacts with proton of water to form HX
4. It reacts with H.O to form alkane

Solution

(xxiv) What will be the product of the following reaction: C6H5ONa + C2H5Cl→? 1. C6H5COC2H5 2. C6H5OC2H5 3. C6H5OC2H4Cl 4. C2H5OC2H6

Solution

(xxv) Allyl chloride on dehydrochlorination gives:
1. Propadiene
2. Propylene
3. Alkyl alcohol
4. Acetyl chloride

Solution

(xxvi) Arrange the following sets of compounds in order of their increasing boiling points. A. Pentan-1-ol B. Butan-1-ol C. Butan-2-ol D. Ethanol E. Propan-1-ol Choose the correct answer from the options given below: 1. A< B< C< D< E 2. B< C< D< E< A 3. C< D< E< A< B 4. D< E< C< B< A

Solution

(xxvii) Monochlorination of toulene in sunlight followed by hydrolysis with aq NaOH yields.
1. o-Cresol
2. m-Cresol
3. 2,4-Dihydroxytoulene
4. Benzylalcohal

Solution

(xxviii) When phenol is treated with chloroform in the presence of NaOH, the major product formed is ?
1. 2-Hydroxybenzoic acid
2. Anisole
3. Salicyaldehyde
4. Methoxytoluene

Solution

(xxix) Reaction of nitrous acid with aliphatic primary amine in cold gives.
1. A diazonium salt
2. An alcohol
3. A nitrite
4. A dye

Solution

(xxx) Aniline upon heating with conc. HNO3 and concentrated H2S04 mixture gives. 1. o- and p-nitroaniline 2. o-Nitroaniline 3. Black terry mass 4. 2,4,6-trinitroaniline

Solution

(xxxi) Which of the following will not be sweet in taste?
1. Maltose
2. Glycogen
3. Lactose
4. Fructose

Solution

(xxxii) Which of the following will act as antiseptic as well as disinfectant?
1. Boric acid
2. Iodoform
3. Sulphur dioxide
4. Phenol

Solution

(xxxiii) Bredig's arc method is.
1. To coagulate colloidal sol
2. To prepare colloidal sol
3. To purify the colloidal sol
4. To prepare the micelles

Solution

(xxxiv) The formation of micelles takes place.
1. Only above a particular temperature and above a particular concentration
2. Only below a particular temperature and below a particular concentration
3. Only above Kraft temperature and below CMC
4. Only below Kraft temperature and above CMC

Solution

(xxxv) The Arseneous sulphide As2S3 sol has negative (-) charge. The maximum power to precipiate it is of:
1. H28O4
2. Na3PO4
3. CaCl2
4. AlCl3

CUET EXAM Chemistry Previous Year Questions Set 1

CUET Chemistry 2023 Set 1

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