The effect of heating Boric acid at 370 K or above is -
1. Orthoboric acid changes to metaboric acid
2. Metaboric acid changes to boric oxide
3. Both '1' and '2'
4. Neither '1' nor '2'
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe electron-deficient compound among the following is -
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe hybridization of carbon in (a) (b) diamond (c) graphite is respectively-
1. , ,
2. , ,
3. , ,
4. , ,
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe B–F bond lengths in (130 pm) and (143 pm) differ because of-
1. Presence of triple bond character in
2. Resonance in
3. Presence of a double bond character in
4. Presence of a double bond character in
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyB–Cl bond has a dipole moment. Still, the BCl3 molecule has zero dipole moment because-
1. The respective dipole-moments of the B–Cl bond add with each other
2. The respective dipole-moments of the B–Cl bond cancel each other
3. BCl3 is tetrahedral in shape
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCO is a poisonous gas because -
1. It forms a complex with hemoglobin.
2. The CO–Hb complex is about 300 times more stable than the –Hb complex.
3. It can kill a person through suffocation on not receiving oxygen.
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn excessive content of CO2 is responsible for global warming as-
1. Higher the level of carbon dioxide, higher is the amount of heat trapped.
2. Higher the level of oxygen, higher is the amount of heat trapped.
3. Higher the level of carbon dioxide, lesser is the amount of heat trapped.
4. Higher the level of oxygen, lesser is the amount of heat trapped.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe sharp decrease in ionization enthalpy from carbon to silicon happens because of-
1. Decrease in the charge of elements upon moving down the group.
2. Decrease in the atomic sizes of elements upon moving down the group.
3. Increase in the atomic sizes of elements upon moving down the group.
4. Increase in the charge of elements upon moving down the group.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe correct explanation for the lower atomic radius of Ga as compared to Al is -
1. Poor shielding effect of the 2d-electrons
2. Poor shielding effect of the 3d-electrons
3. Poor shielding effect of the 3p-electrons
4. Poor shielding effect of the 2s-electrons
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAmphoteric oxides are:
1. ,
2. ,
3. ,
4. ,
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology