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?
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?
