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Q. No.The element having atomic number 19, is:
1. an inert gas
2. a metal with oxidation number +1
3. a non-metal with oxidation number -3
4. a metal with oxidation number -3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following has the least density?
1. Na
2. Li
3. Mg
4. K
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEka aluminium and Eka silicon are now known as:
1. Ga and Ge
2. Al and Si
3. Fe and S
4. H+ and Si
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn element having the electronic configuration of its atom ns2 np2 should have similar properties to those of:
1. Sodium
2. Carbon
3. Magnesium
4. Oxygen
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe order of basic character of given oxides is:
1. Na2O > MgO > Al2O3 > CuO
2. MgO > Al2O3 > CuO > Na2O
3. Al2O3 > MgO > CuO > Na2O
4. CuO > Na2O > MgO > Al2O3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA variable oxidation state is shown by which of the following?
1. Na
2. Cu
3. Mg
4. Al
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe lightest metal in the periodic table is:
1. H
2. Mg
3. Ca
4. Li
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following electronic configurations represents the d-block element?
1. 1s2 2s2 2p6 3s23p63d10 4s24p6
2. 1s2 2s2 2p6 3s23p63d10 4s24p1
3. 1s2 2s2 2p6 3s23p63d10 4s2
4. 1s2 2s2 3s23p6 4s2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe most common oxidation state of cerium (Ce) is:
1. +5, +3
2. +5, +4
3. +3, +4
4. +3, +5
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the electronic configuration of an atom has the lowest ionization enthalpy?
1. 1s2,2s22p5
2. 1s2,2s22p3
3. 1s2,2s22,3s1
4. 1s2,2s22p6
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