Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

(1). Noble gases are sparingly soluble in water
(2). Noble gases have very high melting and boiling points.
(3). Noble gases have weak dispersion forces.
(4). Noble gases have large positive values of electron gain enthalpy.

Number of Attempts: 2

Correct Attempts: 1

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Statement I : Acid strength increases in the order given as
HF << HCI << HBr << HI.
Statement II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.
In the light of the above statements, choose thecorrect answer from the options given below.

(1). Both Statement I and Statement II are true.
(2). Both Statement I and Statement II are false.
(3). Statement I is correct but Statement Il isfalse.
(4). Statement I is incorrect but Statement II istrue.

Number of Attempts: 2

Correct Attempts: 1

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Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code


(1). (a) - (ii), (b) -(iii), (c) - (iv), (d) - (i)
(2). (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv)
(3). (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
(4). (a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)

Number of Attempts: 2

Correct Attempts: 1

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The correct order of atomic radii in group 13 elements is

(1). B < Ga < Al < In < Tl
(2). B < Ga < Al < Tl < In
(3). B < Al < Ga < In < Tl
(4). B < Al < In < Ga < Tl

Number of Attempts: 2

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Which is the correct statement for the given acids ?

(1). Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
(2). Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
(3). Both are triprotic acids
(4). Both are diprotic acids

Number of Attempts: 2

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Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules ?

(1). Cl₂ > Br₂ > F₂ > I₂
(2). Br₂ > I_{2 > F2 > Cl2
(3). F2 > Cl2 Br2 > I2
(4). I2 > Br2 > Cl2 > F2}

Number of Attempts: 2

Correct Attempts: 1

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The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.

(1). Copper
(2). Calcium
(3). Potassium
(4). Iron

Number of Attempts: 2

Correct Attempts: 1

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Which of the following oxoacid of sulphur has -O-O-linkage?

(1). H₂SO₄, sulphuric acid
(2). H₂S₂O₈, peroxodisulphuric acid
(3). H₂s₂O₇. pyrosulphuric acid
(4). H₂SO₃, sulphurous acid

Number of Attempts: 2

Correct Attempts: 1

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ldentify the correct statements from the following:
(a) CO₂(g) is used as refrigerant for ice-cream and frozen food.
(b) The structure of C₆₀ contains twelve six carbon rings and twenty five carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is colorless and odourless gas.

(1). (a) and (c) only
(2). (b) and (c) only
(3). (c) and (d) only
(4). (a), (b) and (c) only

Number of Attempts: 2

Correct Attempts: 1

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Match the following :


(1). (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
(2). (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
(3). (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
(4). (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

Number of Attempts: 2

Correct Attempts: 1

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The correct structure or tribromo octaoxide is

(1).
(2).
(3).
(4).

Number of Attempts: 2

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Which is the correct thermal stability order for H₂E
(E = O, S, Se, Te and Po)?

(1). H₂O < H₂S < H₂Se < H₂Te < H₂Po
(2). H₂Po < H₂Te < H₂Se < H₂S < H₂O
(3). H₂Se < H₂Te < H₂Po < H₂O < H₂S
(4). H₂S < H₂O < H₂Se < H₂Te < H₂Po

Number of Attempts: 2

Correct Attempts: 1

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Which of the following is incorrect statement ?

(1). SiCl₄ is easily hydrolysed.
(2). GeX_{4 (X = F, Cl, Br, I) is more stable than GeX2.
(3). SnF4 is ionic in nature.
(4). PbF4 is covalent in nature.}

Number of Attempts: 2

Correct Attempts: 1

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Which of the following species is not stable?

(1). [GeCl₆]^2–
(2). [Sn(OH)₆]^2–
(3). [SiCl₆]^2–
(4). [SiF₆]^2–

Number of Attempts: 2

Correct Attempts: 1

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Which of the following oxides is most acidic in nature ?

(1). CaO
(2). BaO
(3). BeO
(4). MgO

Number of Attempts: 2

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Which of the following statements is not true for halogens ?

(1). Chlorine has the highest electron-gain enthalpy.
(2). All halogens except fluorine show positive oxidation states. .
(3). All are oxidizing agents.
(4). All form monobasic oxyacids

Number of Attempts: 2

Correct Attempts: 1

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Which one of the following elements is unable to form \(\text{MF}_^{3-} ion ?

(1). In
(2). B
(3). Al
(4). Ga

Number of Attempts: 2

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When copper is heated with conc. HNO₃ it produces

(1). Cu(NO₃)₂ and NO
(2). Cu(NO₃)₂, NO and NO₂
(3). Cu(NO₃)₂ and N₂O
(4). Cu(NO₃)₂ and NO₂

Number of Attempts: 2

Correct Attempts: 1

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Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option.


(1). A - 1, B - 2, C - 4, D - 3
(2). A - 4, B - 3, C - 1, D - 2
(3). A - 4, B - 1, C - 2, D - 3
(4). A - 1, B - 3, C - 4, D - 2

Number of Attempts: 2

Correct Attempts: 1

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Which one of the following statements is correct when SO₂ is passed through acidified K₂Cr₂O₇ solution ?

(1). The solution is decolourized
(2). SO₂ is reduced
(3). Green Cr₂(SO₄)₃ is formed
(4). The solution turns blue

Number of Attempts: 2

Correct Attempts: 1

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