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2023 96 questions

Q662023 · 13 Apr 2023 · Shift 1
$ClF_{5}$ at room temperature is a:
1. A.Colourless liquid with square pyramidal geometry
2. B.Colourless gas with square pyramidal geometry
3. C.Colourless gas with trigonal bipyramidal geometry.
4. D.Colourless liquid with trigonal bipyramidal geometry
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Answer: A
Q682023 · 13 Apr 2023 · Shift 1
2-Methyl propyl bromide reacts with $C_{2} H_{5} O^{-}$ and gives 'A' whereas on reaction with $C_{2} H_{5} OH$ it gives 'B'. The mechanism followed in these reactions and the products 'A' and 'B' respectively are :
1. A. $S_{N} 1$ , $A = tert-butyl ethyl ether$ ; $S_{N} 2$ , $B = iso-butyl ethyl ether$
2. B. $S_{N} 1$ , $A = tert-butyl ethyl ether$ ; $S_{N} 1$ , $B = 2-butyl ethyl ether$
3. C. $S_{N} 2$ , $A = iso-butyl ethyl ether$ ; $S_{N} 1$ , $B = tert-butyl ethyl ether$
4. D. $S_{N} 2$ , $A = 2-butyl ethyl ether$ ; $S_{N} 2$ , $B = iso-butyl ethyl ether$
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Answer: C
Q752023 · 13 Apr 2023 · Shift 1
What happens when a lyophilic sol is added to a lyophobic sol?
1. A.Film of lyophobic sol is formed over lyophilic sol.
2. B.Lyophilic sol is dispersed in lyophobic sol.
3. C.Film of lyophilic sol is formed over lyophobic sol.
4. D.Lyophobic sol is coagulated
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Answer: C
Q762023 · 13 Apr 2023 · Shift 1
Which one of the following is most likely a mismatch ?
1. A.Titanium - van Arkel Method
2. B.Zinc - Liquation
3. C.Nickel - Mond process
4. D.Copper - Electrolysis
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Answer: B
Q772023 · 13 Apr 2023 · Shift 1
The incorrect statement from the following for borazine is :
1. A.It can react with water.
2. B.It is a cyclic compound.
3. C.It has electronic delocalization.
4. D.It contains banana bonds.
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Answer: D
Q792023 · 13 Apr 2023 · Shift 1
$Be (OH)_{2}$ reacts with $Sr (OH)_{2}$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following :
1. A. $Be$ is tetrahedrally coordinated in the ionic salt.
2. B.The element $Be$ is present in the cationic part of the ionic salt.
3. C.Both $Sr$ and $Be$ elements are present in the ionic salt.
4. D.The reaction is an example of acid - base neutralization reaction.
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Answer: B
Q722023 · 13 Apr 2023 · Shift 2
1. A.Both A and R are correct but R is NOT the correct explanation of A
2. B.A is false but R is true
3. C.A is true but R is false
4. D.Both A and R are correct and R is the correct explanation of A
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Answer: A
Q752023 · 13 Apr 2023 · Shift 2
Better method for preparation of $BeF_{2}$ , among the following is :
1. A. $BeH_{2} + F_{2} Δ BeF_{2}$
2. B. $(NH_{4})_{2} BeF_{4} Δ BeF_{2}$
3. C. $Be + F_{2} Δ BeF_{2}$
4. D. $BeO + C + F_{2} Δ BeF_{2}$
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Answer: B
Q832023 · 13 Apr 2023 · Shift 2· Numerical answer
See the following chemical reaction: $Cr_{2} O_{7}^{2 -} + XH^{+} + 6 Fe^{2 +} \to YCr^{3 +} + 6 Fe^{3 +} + ZH_{2} O$ The sum of X, Y and Z is ___________
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Answer: 23
Q842023 · 13 Apr 2023 · Shift 2· Numerical answer
$1 g$ of a carbonate $(M_{2} CO_{3})$ on treatment with excess $HCl$ produces $0.01 mol$ of $CO_{2}$ . The molar mass of $M_{2} CO_{3}$ is ___________ $g mol^{- 1}$ . (Nearest integer)
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Answer: 100
Q632023 · 12 Apr 2023 · Shift 1
$2-hexene (i) O_{3} (ii) H_{2} O Products$ The two products formed in above reaction are -
1. A.Butanal and acetaldehyde
2. B.Butanoic acid and acetic acid
3. C.Butanal and acetic acid
4. D.Butanoic acid and acetaldehyde
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Answer: B
Q692023 · 12 Apr 2023 · Shift 1
1. A.'B' is N-nitroso ammonium compound
2. B.The product 'B' formed in the above reaction is p-nitroso compound at low temperature
3. C.The electrophile involved in the reaction is $N O^{+}$
4. D.The reaction occurs at low temperature
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Answer: A
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