NEET Chemistry Questions: Chemistry practical

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In borax bead test, which of the following compound is formed [CBSE PMT 2002]




In the borax bead test, borax ( ext{Na}_2 ext{B}_4 ext{O}_7 ullet 10 ext{H}_2 ext{O}) is heated in a flame to form a glassy bead of sodium metaborate ( ext{NaBO}_2). This bead can react with certain metal oxides to form characteristic colors. Hence, the compound formed is Meta borate.
The metal that does not give the borax-bead test is [MP PMT 1999]




Lead (Pb) does not give the borax bead test. The borax bead test is typically used for detecting transition metals which form colored beads due to the formation of metal borates. Lead is not a transition metal and does not form the colored beads characteristic of this test.
Which of the following is coloured compound? [BCECE 2005]




$CuF_2$ (Copper(II) fluoride) is a colored compound. Copper compounds often display colors due to the d-d electronic transitions in the copper ions. In contrast, compounds like CuI, NaCl, and $MgCl_2$ are typically white or colorless.
Which gives violet coloured bead in borax bead test [BHU 1988; MP PET 1997]




No explanation available.
When concentrated $H_2SO_4$ is added to dry $KNO_3$ , brown fumes evolve. These fumes are [CPMT 1988; IIT 1987]




When concentrated $H_2SO_4$ is added to dry $KNO_3$, brown fumes of nitrogen dioxide ($NO_2$) are evolved. The reaction can be represented as: $$2KNO_3 + H_2SO_4 \rightarrow 2HNO_3 + K_2SO_4$$ $$2HNO_3 \rightarrow 2NO_2 + H_2O + O_2$$ The $NO_2$ gas is brown in color.
Which one of the following salt give green coloured flame when the salt is tested by Pt wire




Barium salts give a green-colored flame when tested by Pt wire. This flame test is a qualitative analysis method used to detect the presence of barium ions. The characteristic green flame is due to the excitation of electrons in barium ions.
Sodium sulphite on heating with dilute HCl liberates a gas which [NCERT 1972]




When sodium sulphite (Na2SO3) is heated with dilute hydrochloric acid (HCl), sulfur dioxide (SO2) gas is liberated. This gas turns acidified potassium dichromate paper green due to the reduction of orange potassium dichromate (K2Cr2O7) to green chromium sulfate (Cr2(SO4)3) in acidic conditions.
Starch-iodide paper is used for the test of




No explanation available.
Which of the following salt gives white precipitate with solution and dil. solution and gives green flame test




Barium chloride (BaCl2) gives a white precipitate of barium sulfate (BaSO4) when mixed with a sulfate solution. Additionally, barium ions impart a green color to the flame during a flame test.
Two gases when mixed give white dense fumes, the gases are




When ammonia ($NH_3$) reacts with hydrogen chloride ($HCl$), it forms ammonium chloride ($NH_4Cl$), which appears as white dense fumes. The reaction can be represented as: $NH_3 + HCl ightarrow NH_4Cl$.
Blue borax bead is obtained with [MADT Bihar 1982; MP PET 1995]




The blue borax bead test is a qualitative test for the presence of cobalt. When borax is heated with cobalt, it forms a blue-colored bead due to the formation of cobalt borate. Hence, cobalt is responsible for the blue borax bead.
Which of the following imparts green colour to the burner flame [DCE 2004]




Boron compounds, such as trimethyl borate ($B(OMe)_3$), impart a green color to the burner flame. This is a characteristic flame test for boron.
A colourless gas with the smell of rotten fish is [AFMC 2005]




Phosphine ($PH_3$) is a colorless gas with a smell of rotten fish. It is a compound of phosphorus and hydrogen.
$ MnO_2 and H_2SO_4 $ added to NaCl, the greenish yellow gas liberated is [Orissa JEE 2005]




When $MnO_2$ and $H_2SO_4$ are added to NaCl, chlorine gas ($Cl_2$) is liberated. This reaction is a redox reaction where $MnO_2$ acts as an oxidizing agent and oxidizes $Cl^-$ ions from NaCl to form $Cl_2$ gas.
Which of the following statement(s) is(are) correct when a mixture of NaCl and $K_2Cr_2O_7 $ is gently warmed with conc $H_2SO_4$ . [IIT 1998; CPMT 1988; AMU 1984; MP PMT 2002]




No explanation available.