NEET Test Series from KOTA - 10 Papers In MS WORD
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PRACTICAL CHEMISTRY
37568
Assertion : \(Fe^{3+}\) can be used for coagulation of \(As_2S_3\) sol. Reason : \(Fe^{3+}\) reacts with \(As_2S_3\) to give \(Fe_2S_3\)
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(Fe^{3+}\) can be used to coagulate \(As_2S_3\) as sol of \(As_2S_3\) is negatively charged due to adsorption of \(S^{2-}\) ions. The positive charge of \(Fe^{3+}\) ion neutralises the negative charge of sol particles. Reason as given in the question does not explain \(A\).
PRACTICAL CHEMISTRY
37569
Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers. Reason : Change in colour is due to the complexation of alcohol with potassium dichromate.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(A\) is true but \(R\) is wrong because change in colour of potassium dichromate is due to oxidation of alcohol by dichromate. \(K_2Cr_2O_7 + 4H_2SO_4 \longrightarrow K_2SO_4 + Cr_2(SO_4)_3 + 4H_2O + 3O\) \(C_2H_5OH + O \longrightarrow CH_3COOH\)
PRACTICAL CHEMISTRY
37570
Assertion : \(Cu^{2+}\) and \(Cd^{2+}\) are separated from each other by first adding \(KCN\) solution and then passing \(H_2S\) gas. Reason : \(KCN\) reduces \(Cu^{2+}\) to \(Cu^+\) and forms a complex with it.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(KCN\) forms complexes with \(Cu^+\) and \(Cd^{2+}\) as \(K_3[Cu(CN)_4]\) and \(K_2[Cd(CN)_4]\) respectively. On passing \(H_2S\), only \(Cd^{2+}\) complex is decomposed to give yellow \(CdS\) precipitate
PRACTICAL CHEMISTRY
37571
While titrating dilute \(HCl\) solution with aqueous \(NaOH ,\) which of the following will not be required?
37568
Assertion : \(Fe^{3+}\) can be used for coagulation of \(As_2S_3\) sol. Reason : \(Fe^{3+}\) reacts with \(As_2S_3\) to give \(Fe_2S_3\)
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(Fe^{3+}\) can be used to coagulate \(As_2S_3\) as sol of \(As_2S_3\) is negatively charged due to adsorption of \(S^{2-}\) ions. The positive charge of \(Fe^{3+}\) ion neutralises the negative charge of sol particles. Reason as given in the question does not explain \(A\).
PRACTICAL CHEMISTRY
37569
Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers. Reason : Change in colour is due to the complexation of alcohol with potassium dichromate.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(A\) is true but \(R\) is wrong because change in colour of potassium dichromate is due to oxidation of alcohol by dichromate. \(K_2Cr_2O_7 + 4H_2SO_4 \longrightarrow K_2SO_4 + Cr_2(SO_4)_3 + 4H_2O + 3O\) \(C_2H_5OH + O \longrightarrow CH_3COOH\)
PRACTICAL CHEMISTRY
37570
Assertion : \(Cu^{2+}\) and \(Cd^{2+}\) are separated from each other by first adding \(KCN\) solution and then passing \(H_2S\) gas. Reason : \(KCN\) reduces \(Cu^{2+}\) to \(Cu^+\) and forms a complex with it.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(KCN\) forms complexes with \(Cu^+\) and \(Cd^{2+}\) as \(K_3[Cu(CN)_4]\) and \(K_2[Cd(CN)_4]\) respectively. On passing \(H_2S\), only \(Cd^{2+}\) complex is decomposed to give yellow \(CdS\) precipitate
PRACTICAL CHEMISTRY
37571
While titrating dilute \(HCl\) solution with aqueous \(NaOH ,\) which of the following will not be required?
37568
Assertion : \(Fe^{3+}\) can be used for coagulation of \(As_2S_3\) sol. Reason : \(Fe^{3+}\) reacts with \(As_2S_3\) to give \(Fe_2S_3\)
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(Fe^{3+}\) can be used to coagulate \(As_2S_3\) as sol of \(As_2S_3\) is negatively charged due to adsorption of \(S^{2-}\) ions. The positive charge of \(Fe^{3+}\) ion neutralises the negative charge of sol particles. Reason as given in the question does not explain \(A\).
PRACTICAL CHEMISTRY
37569
Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers. Reason : Change in colour is due to the complexation of alcohol with potassium dichromate.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(A\) is true but \(R\) is wrong because change in colour of potassium dichromate is due to oxidation of alcohol by dichromate. \(K_2Cr_2O_7 + 4H_2SO_4 \longrightarrow K_2SO_4 + Cr_2(SO_4)_3 + 4H_2O + 3O\) \(C_2H_5OH + O \longrightarrow CH_3COOH\)
PRACTICAL CHEMISTRY
37570
Assertion : \(Cu^{2+}\) and \(Cd^{2+}\) are separated from each other by first adding \(KCN\) solution and then passing \(H_2S\) gas. Reason : \(KCN\) reduces \(Cu^{2+}\) to \(Cu^+\) and forms a complex with it.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(KCN\) forms complexes with \(Cu^+\) and \(Cd^{2+}\) as \(K_3[Cu(CN)_4]\) and \(K_2[Cd(CN)_4]\) respectively. On passing \(H_2S\), only \(Cd^{2+}\) complex is decomposed to give yellow \(CdS\) precipitate
PRACTICAL CHEMISTRY
37571
While titrating dilute \(HCl\) solution with aqueous \(NaOH ,\) which of the following will not be required?
NEET Test Series from KOTA - 10 Papers In MS WORD
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PRACTICAL CHEMISTRY
37568
Assertion : \(Fe^{3+}\) can be used for coagulation of \(As_2S_3\) sol. Reason : \(Fe^{3+}\) reacts with \(As_2S_3\) to give \(Fe_2S_3\)
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(Fe^{3+}\) can be used to coagulate \(As_2S_3\) as sol of \(As_2S_3\) is negatively charged due to adsorption of \(S^{2-}\) ions. The positive charge of \(Fe^{3+}\) ion neutralises the negative charge of sol particles. Reason as given in the question does not explain \(A\).
PRACTICAL CHEMISTRY
37569
Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers. Reason : Change in colour is due to the complexation of alcohol with potassium dichromate.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(A\) is true but \(R\) is wrong because change in colour of potassium dichromate is due to oxidation of alcohol by dichromate. \(K_2Cr_2O_7 + 4H_2SO_4 \longrightarrow K_2SO_4 + Cr_2(SO_4)_3 + 4H_2O + 3O\) \(C_2H_5OH + O \longrightarrow CH_3COOH\)
PRACTICAL CHEMISTRY
37570
Assertion : \(Cu^{2+}\) and \(Cd^{2+}\) are separated from each other by first adding \(KCN\) solution and then passing \(H_2S\) gas. Reason : \(KCN\) reduces \(Cu^{2+}\) to \(Cu^+\) and forms a complex with it.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
\(KCN\) forms complexes with \(Cu^+\) and \(Cd^{2+}\) as \(K_3[Cu(CN)_4]\) and \(K_2[Cd(CN)_4]\) respectively. On passing \(H_2S\), only \(Cd^{2+}\) complex is decomposed to give yellow \(CdS\) precipitate
PRACTICAL CHEMISTRY
37571
While titrating dilute \(HCl\) solution with aqueous \(NaOH ,\) which of the following will not be required?