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2023 96 questions

Q802023 · 12 Apr 2023 · Shift 1
1. A. $X = CaC O_{3}, Y = NaCl, Z = KCl$
2. B. $X = CaO, Y = NaCl + C O_{2}, Z = NaCl$
3. C. $X = CaC O_{3}, Y = NaCl, Z = HCl$
4. D. $X = CaO, Y = NaCl + C O_{2}, Z = KCl$
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Answer: C
Q902023 · 12 Apr 2023 · Shift 1· Numerical answer
At $600 K$ , the root mean square (rms) speed of gas $X$ ( $molar mass = 40$ ) is equal to the most probable speed of gas $Y$ at $90 K$ . The molar mass of the gas $Y$ is ___________ $g mol^{- 1}$ . (Nearest integer)
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Answer: 4
Q712023 · 11 Apr 2023 · Shift 1
For compound having the formula $GaAlC l_{4}$ , the correct option from the following is :
1. A. $Cl$ forms bond with both $Al$ and $Ga$ in $GaAlC l_{4}$
2. B.Oxidation state of $Ga$ in the salt $GaAlC l_{4}$ is $+ 3$ .
3. C. $Ga$ is coordinated with $Cl$ in $GaAlC l_{4}$
4. D. $Ga$ is more electronegative than $Al$ and is present as a cationic part of the salt $GaAlC l_{4}$
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Answer: D
Q622023 · 11 Apr 2023 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q722023 · 11 Apr 2023 · Shift 2
For a chemical reaction $A + B \to Product$ , the order is 1 with respect to A and B. | Rate $mol L^{- 1} S^{- 1}$ | $[A] mol L^{- 1}$ | $[B] mol L^{- 1}$ | | :--- | :--- | :--- | | $0.10$ | $20$ | $0.5$ | | $0.40$ | $x$ | $0.5$ | | $0.80$ | $40$ | $y$ | What is the value of $x$ and $y$ ?
1. A.80 and 4
2. B.160 and 4
3. C.80 and 2
4. D.40 and 4
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Answer: C
Q762023 · 11 Apr 2023 · Shift 2
Which one of the following pairs is an example of polar molecular solids?
1. A. $HCl (s), AlN (s)$
2. B. $MgO (s), S O_{2} (s)$
3. C. $S O_{2} (s), N H_{3} (s)$
4. D. $S O_{2} (s), C O_{2} (s)$
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Answer: C
Q612023 · 10 Apr 2023 · Shift 1
The compound which does not exist is
1. A. $(NH_{4})_{2} BeF_{4}$
2. B. $PbEt_{4}$
3. C. $BeH_{2}$
4. D. $NaO_{2}$
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Answer: D
Q692023 · 10 Apr 2023 · Shift 1
Given $(A) (B) 2 CO(g) + O_{2} (g) \to 2 CO_{2} (g) C(graphite) + O_{2} (g) \to CO_{2} (g) Δ H_{1}^{0} = - x kJ mol^{- 1} Δ H_{2}^{0} = - y kJ mol^{- 1}$ $Δ H^{0}$ for the reaction $C(graphite) + \frac{1}{2} O_{2} (g) \to CO(g)$ is :
1. A. $\frac{x - 2 y}{2}$
2. B. $\frac{x + 2 y}{2}$
3. C. $2 y - x$
4. D. $\frac{2 x - y}{2}$
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Answer: A
Q712023 · 10 Apr 2023 · Shift 1
Given below are two statements: Statement I : Aqueous solution of $K_{2} Cr_{2} O_{7}$ is preferred as a primary standard in volumetric analysis over $Na_{2} Cr_{2} O_{7}$ aqueous solution. Statement II : $K_{2} Cr_{2} O_{7}$ has a higher solubility in water than $Na_{2} Cr_{2} O_{7}$ . In the light of the above statements, choose the correct answer from the options given below:
1. A.Statement I is true but Statement II is false
2. B.Both Statement I and Statement II are false
3. C.Statement I is false but Statement II is true
4. D.Both Statement I and Statement II are true
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Answer: A
Q762023 · 10 Apr 2023 · Shift 1
Lime reacts exothermically with water to give 'A' which has low solubility in water. Aqueous solution of 'A' is often used for the test of $CO_{2}$ , a test in which insoluble B is formed. If B is further reacted with $CO_{2}$ then soluble compound is formed, 'A' is :
1. A.Quick lime
2. B.White lime
3. C.Lime water
4. D.Slaked lime
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Answer: D
Q822023 · 10 Apr 2023 · Shift 1· Numerical answer
The number of bent-shaped molecule/s from the following is _________ $N_{3}^{-}, NO_{2}^{-}, I_{3}^{-}, O_{3}, SO_{2}$
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Answer: 3
Q882023 · 10 Apr 2023 · Shift 1· Numerical answer
$Fe O_{4}^{2 -} + 2.2V F e^{3 +} + 0.70V F e^{2 +} - 0.45V F e^{0}$ $E_{Fe O_{4}^{2 -} /F e^{2 +}}^{0}$ is $x \times 1 0^{- 3} V$ . The value of $x$ is _________
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Answer: 1825
Q902023 · 10 Apr 2023 · Shift 1· Numerical answer
At constant temperature, a gas is at a pressure of 940.3 mm Hg. The pressure at which its volume decreases by 40% is __________ mm Hg. (Nearest integer)
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Answer: 1567
Q632023 · 10 Apr 2023 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q652023 · 10 Apr 2023 · Shift 2
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : $3.1500 g$ of hydrated oxalic acid dissolved in water to make $250.0 mL$ solution will result in 0.1 M oxalic acid solution. Reason R : Molar mass of hydrated oxalic acid is $126 g mol^{- 1}$ In the light of the above statements, choose the correct answer from the options given below.
1. A.Both A and R are true but R is NOT the correct explanation of A
2. B.A is true but R is false
3. C.Both A and R are true and R is the correct explanation of A
4. D.A is false but R is true
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Answer: C
Q672023 · 10 Apr 2023 · Shift 2
1. A.E > C > D > A > B
2. B.D > E > C > A > B
3. C.E > D > C > B > A
4. D.C > E > D > B > A
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Answer: A
Q732023 · 10 Apr 2023 · Shift 2
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Physical properties of isotopes of hydrogen are different. Reason R : Mass difference between isotopes of hydrogen is very large. In the light of the above statements, choose the correct answer from the options given below:
1. A.A is true but R is false
2. B.Both A and R are true but R is NOT the correct explanation of A
3. C.A is false but R is true
4. D.Both A and R are true and R is the correct explanation of A
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Answer: D
Q762023 · 10 Apr 2023 · Shift 2
Ferric chloride is applied to stop bleeding because -
1. A. $FeCl_{3}$ reacts with the constituents of blood which is a positively charged sol.
2. B.Blood absorbs $FeCl_{3}$ and forms a complex.
3. C. $Cl^{-}$ ions cause coagulation of blood.
4. D. $Fe^{3 +}$ ions coagulate blood which is a negatively charged sol.
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Answer: D
Q802023 · 10 Apr 2023 · Shift 2
The delicate balance of $CO_{2}$ and $O_{2}$ is NOT disturbed by :
1. A.Burning of Coal
2. B.Burning of petroleum
3. C.Respiration
4. D.Deforestation
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Answer: C
Q862023 · 10 Apr 2023 · Shift 2· Numerical answer
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Answer: 1
Q882023 · 10 Apr 2023 · Shift 2· Numerical answer
$A(g) ⇌ 2 B(g) + C(g)$ For the given reaction, if the initial pressure is 450 mm Hg and the pressure at time $t$ is 720 mm Hg at a constant temperature T and constant volume V. The fraction of A(g) decomposed under these conditions is $x \times 1 0^{- 1}$ . The value of $x$ is _________ (nearest integer)
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Answer: 3
Q652023 · 8 Apr 2023 · Shift 1
$2 IO_{3}^{-} + x I^{-} + 12 H^{+} \to 6 I_{2} + 6 H_{2} O$ What is the value of $x$ ?
1. A. $10$
2. B. $2$
3. C. $12$
4. D. $6$
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Answer: A
Q882023 · 8 Apr 2023 · Shift 1· Numerical answer
The number of following statement/s which is/are incorrect is ___________ (A) Line emission spectra are used to study the electronic structure (B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet (C) An absorption spectrum is like the photographic negative of an emission spectrum (D) The element helium was discovered in the sun by spectroscopic method
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Answer: 1
Q902023 · 8 Apr 2023 · Shift 1· Numerical answer
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Answer: 3
Q622023 · 8 Apr 2023 · Shift 2
1. A.2 - Formyl -5-methylhexan-6-oic acid
2. B.5-Methyl-2-oxohexan-6-oic acid
3. C.5-Formyl -2-methylhexanoic acid
4. D.2-Methyl-5-oxohexanoic acid
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Answer: D