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NEET Practice Questions (MCQs) with Answers & Solutions

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On heating $ NaCl + K_2Cr_2O_7 + Conc. H_2SO_4 $ , we get

A. $ O_2 $ B. $ Cl_2 $ C. $ CrOCl_2 $ D. $ CrO_2 Cl_2 $

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Explanation

$ CrO_2Cl_2 $ is a orange red gas

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Amongst $ LiCl , RbCl , BeCl_2 \& MgCl_2 $ , max. & min. ionic character will be shown by

A. $ LiCl , MgCl_2. $ B. $ RbCl , BeCl_2 $ C. $ RbCl , MgCl_2 $ D. $ MgCl_2, BeCl_2 $

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Explanation

Acc to Fajan's rule , largest cation & smallest an ion

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Which of following chloride is water insoluble

A. HCl B. AgCl C. Both 1 & 2 D. None

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Explanation

AgCl is water insoluble chloride.

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The alkali metal halide are soluble in water but LiF is insoluble because

A. It's Amphoteric B. Li -F is highly ionic C. It's Lattice energy is high D. $ Li^+ $ ion is least hydrated.

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Explanation

Small atomic size of Li & F , lattice energy highest

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Which of following is present as an active ingredient in bleaching powder for bleaching action

A. $ CaCL_2 $ B. $ CaOCl_2 $ C. $ Ca(Ocl)_2 $ D. $ CaO_2 Cl $

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Explanation

Fact.

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$ ClO_2 reacts with O_3 $ to give

A. $ Cl_2 O_4 $ B. $ Cl_2 O $ C. $ Cl_2 O_6 $ D. $ ClO_4 $

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Explanation

$ Cl_2O_6 is formed by reaction of ClO_2 \& O_3. $

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Bad conductor Of electricity is

A. $ H_2 F_2 $ B. HCl C. HBr D. HI

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Explanation

due to H - bonding free ions are not present in aq sol. Hence bad condc.

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When KBr is treated with concentrated $ H_2SO_4 $ redish brown gas evolved, gas is

A. Mixture of Br & HBr B. $ Bromine \& HNO_3 $ C. Bromine D. None of these.

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Explanation

$ 2KBr + 3H_2SO_4 + MnO_2 \rightarrow [] { { \triangle } } 2KHSO_4 + MnSO_4 + 2H_2O + Br_2 $

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Which of following outer electronic configuration represents Ar?

A. $ ns^2 $ B. $ ns^2 np^ 6 $ C. $ ns^2 np ^ 5 $ D. $ ns^2 np ^ 4 $

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Explanation

The outer electronic configuration of Argon (Ar) is $ ns^2 np^6 $. Argon is a noble gas with a complete octet in its valence shell. Specifically, for Argon, the configuration is $ 3s^2 3p^6 $.

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Which mineral was used in isolation of radium?

A. Lime stone B. Pitch blende C. Rectile D. Haematite

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Explanation

Pitchblende, also known as uraninite, was the mineral used by Marie Curie to isolate radium. Pitchblende contains uranium, from which radium is extracted as a decay product.

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