37564
Assertion : Borax bead test is not suitable for \(Al\,(III)\). Reason : \(Al_2O_3\) is insoluble in water
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:
Metals form coloured compound (metaborates) with borax. On the basis of colour of metaborates, we can identify the metal. Aluminium does not form coloured metaborate, so this test is not valid for \(Al^{3+}\) ion. \(Al_2O_3\) is insoluble in water but it is not explanation of \(A\)
PRACTICAL CHEMISTRY
37565
Assertion : In the iodometric titration, starch is used as an indicator. Reason : Starch is a polysaccharide
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:
Starch is used as an indicator because it forms blue coloured complex with iodine. Starch is a polysaccharide but this is not explanation of \(A\).
PRACTICAL CHEMISTRY
37566
Assertion : \(K_2Cr_2O_7\) is used as a primary standard in volumetric analysis. Reason : It has a good solubility in water.
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:
\(K_2Cr_2O_7\) is used as primary standard in volumetric analysis because its standard solution can be prepared. \(A\) is true but \(R\) is wrong.
PRACTICAL CHEMISTRY
37567
Assertion : \(Sb_2S_3\), is not soluble in yellow ammonium sulphide. Reason : The common ion effect due to \(S^{2-}\) ions reduces the solubility of \(Sb_2S_3\)
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:
Antimony sulphide \((Sb_2S_3)\) is soluble in yellow ammonium sulphide forming ammonium thioantimonate \(Sb_2S_3 + 3(NH_4 )_2S + 2S \longrightarrow 2(NH_4 )_3SbS_4\) The common ion effect due to \(S^{2-}\) ion does not reduce the solubility of \(Sb_2S_3\). So both \(A\) as well as \(R\), are false.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
PRACTICAL CHEMISTRY
37564
Assertion : Borax bead test is not suitable for \(Al\,(III)\). Reason : \(Al_2O_3\) is insoluble in water
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:
Metals form coloured compound (metaborates) with borax. On the basis of colour of metaborates, we can identify the metal. Aluminium does not form coloured metaborate, so this test is not valid for \(Al^{3+}\) ion. \(Al_2O_3\) is insoluble in water but it is not explanation of \(A\)
PRACTICAL CHEMISTRY
37565
Assertion : In the iodometric titration, starch is used as an indicator. Reason : Starch is a polysaccharide
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:
Starch is used as an indicator because it forms blue coloured complex with iodine. Starch is a polysaccharide but this is not explanation of \(A\).
PRACTICAL CHEMISTRY
37566
Assertion : \(K_2Cr_2O_7\) is used as a primary standard in volumetric analysis. Reason : It has a good solubility in water.
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:
\(K_2Cr_2O_7\) is used as primary standard in volumetric analysis because its standard solution can be prepared. \(A\) is true but \(R\) is wrong.
PRACTICAL CHEMISTRY
37567
Assertion : \(Sb_2S_3\), is not soluble in yellow ammonium sulphide. Reason : The common ion effect due to \(S^{2-}\) ions reduces the solubility of \(Sb_2S_3\)
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:
Antimony sulphide \((Sb_2S_3)\) is soluble in yellow ammonium sulphide forming ammonium thioantimonate \(Sb_2S_3 + 3(NH_4 )_2S + 2S \longrightarrow 2(NH_4 )_3SbS_4\) The common ion effect due to \(S^{2-}\) ion does not reduce the solubility of \(Sb_2S_3\). So both \(A\) as well as \(R\), are false.
37564
Assertion : Borax bead test is not suitable for \(Al\,(III)\). Reason : \(Al_2O_3\) is insoluble in water
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:
Metals form coloured compound (metaborates) with borax. On the basis of colour of metaborates, we can identify the metal. Aluminium does not form coloured metaborate, so this test is not valid for \(Al^{3+}\) ion. \(Al_2O_3\) is insoluble in water but it is not explanation of \(A\)
PRACTICAL CHEMISTRY
37565
Assertion : In the iodometric titration, starch is used as an indicator. Reason : Starch is a polysaccharide
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:
Starch is used as an indicator because it forms blue coloured complex with iodine. Starch is a polysaccharide but this is not explanation of \(A\).
PRACTICAL CHEMISTRY
37566
Assertion : \(K_2Cr_2O_7\) is used as a primary standard in volumetric analysis. Reason : It has a good solubility in water.
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:
\(K_2Cr_2O_7\) is used as primary standard in volumetric analysis because its standard solution can be prepared. \(A\) is true but \(R\) is wrong.
PRACTICAL CHEMISTRY
37567
Assertion : \(Sb_2S_3\), is not soluble in yellow ammonium sulphide. Reason : The common ion effect due to \(S^{2-}\) ions reduces the solubility of \(Sb_2S_3\)
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:
Antimony sulphide \((Sb_2S_3)\) is soluble in yellow ammonium sulphide forming ammonium thioantimonate \(Sb_2S_3 + 3(NH_4 )_2S + 2S \longrightarrow 2(NH_4 )_3SbS_4\) The common ion effect due to \(S^{2-}\) ion does not reduce the solubility of \(Sb_2S_3\). So both \(A\) as well as \(R\), are false.
37564
Assertion : Borax bead test is not suitable for \(Al\,(III)\). Reason : \(Al_2O_3\) is insoluble in water
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:
Metals form coloured compound (metaborates) with borax. On the basis of colour of metaborates, we can identify the metal. Aluminium does not form coloured metaborate, so this test is not valid for \(Al^{3+}\) ion. \(Al_2O_3\) is insoluble in water but it is not explanation of \(A\)
PRACTICAL CHEMISTRY
37565
Assertion : In the iodometric titration, starch is used as an indicator. Reason : Starch is a polysaccharide
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:
Starch is used as an indicator because it forms blue coloured complex with iodine. Starch is a polysaccharide but this is not explanation of \(A\).
PRACTICAL CHEMISTRY
37566
Assertion : \(K_2Cr_2O_7\) is used as a primary standard in volumetric analysis. Reason : It has a good solubility in water.
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:
\(K_2Cr_2O_7\) is used as primary standard in volumetric analysis because its standard solution can be prepared. \(A\) is true but \(R\) is wrong.
PRACTICAL CHEMISTRY
37567
Assertion : \(Sb_2S_3\), is not soluble in yellow ammonium sulphide. Reason : The common ion effect due to \(S^{2-}\) ions reduces the solubility of \(Sb_2S_3\)
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:
Antimony sulphide \((Sb_2S_3)\) is soluble in yellow ammonium sulphide forming ammonium thioantimonate \(Sb_2S_3 + 3(NH_4 )_2S + 2S \longrightarrow 2(NH_4 )_3SbS_4\) The common ion effect due to \(S^{2-}\) ion does not reduce the solubility of \(Sb_2S_3\). So both \(A\) as well as \(R\), are false.