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Chemistry: CUET Mock Test - 7 - NEET MCQ


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40 Questions MCQ Test Chemistry Practice Tests: CUET Preparation - Chemistry: CUET Mock Test - 7

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Chemistry: CUET Mock Test - 7 - Question 1

Aromatic diazonium salts are stable at _____ temperatures.

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 1

Benzenediazonium salts are stable in cold environment, but readily react with water when the temperature increases even slightly.

Chemistry: CUET Mock Test - 7 - Question 2

Benzenediazonium chloride is ______ in water.

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 2

Benzenediazonium chloride is readily soluble in polar solvents like water. However, it is less soluble in solvents like alcohol.

Chemistry: CUET Mock Test - 7 - Question 3

Which of the following diazonium salts is insoluble in water?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 3

Certain diazonium salts such as fluoroborates are insoluble in water. This makes them stable enough to be dried and stored.

Chemistry: CUET Mock Test - 7 - Question 4

Which of the following properties is suitable for all diazonium salts?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 4

Diazonium salts are unstable and may explode in dry state. Therefore, they are generally used in solution or aqueous state.

Chemistry: CUET Mock Test - 7 - Question 5

Which of the following best describes benzenediazonium chloride?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 5

Benzenediazonium chloride is usually obtained in crystal form. It is unstable and formed for a short period when aniline reacts with nitrous acid. It is a salt with chlorine as the negative group and diazo group as positive.

Chemistry: CUET Mock Test - 7 - Question 6

When a blue litmus paper is dipped in an aqueous solution of benzenediazonium bromide, the litmus paper _____

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 6

Benzenediazonium bromide is a salt, made of a positive diazonium group and a negative bromide ion. Thus, it remains neutral to litmus paper.

Chemistry: CUET Mock Test - 7 - Question 7

The carbon-halogen bond of an alkyl halide is polarised due to the _________

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 7

Polarity occurs between two entities when there is a difference in the magnitude and signs of charges between the two entities. In this case, the halogen is more negatively charged than the carbon, and hence it is polarised.

Chemistry: CUET Mock Test - 7 - Question 8

Which is the largest halogen atom?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 8

Iodine lies below bromine, chlorine and fluorine in the halogen group and hence has the largest atomic size.

Chemistry: CUET Mock Test - 7 - Question 9

 If X and Y are the carbon-halogen bond enthalpies in chloroethane and bromoethane respectively, what is the relationship between X and Y?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 9

Since the C-F bond length will be shorter than the C-Cl bond length due to the smaller size of F atom, it will require more energy to break the C-F bond, hence the enthalpy value of C-Cl bond will be lower than that of C-F bond.

Chemistry: CUET Mock Test - 7 - Question 10

If the bond length of C-Cl bond in chloromethane is 178pm, what will be the probable bond length of C-Br bond in bromomethane?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 10

The size of Cl atom is smaller than the size of Br atom as the latter appears lower than Cl in the halogen group. Hence, the carbon-halogen bond length of C-Br must be bigger than that of C-Cl, i.e., 178pm, therefore it must be 193pm.

Chemistry: CUET Mock Test - 7 - Question 11

The size of the halogen atom _________ as we go down the group in the periodic table.

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 11

The common trend within the halogen group in the periodic table is that the size of the atom increases from top to bottom.

Chemistry: CUET Mock Test - 7 - Question 12

The donation of lone pair of electrons of CO carbon into the vacant orbital of metal atom results in _________ bond.

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 12

Synergic bonding is the overall effect of the sigma and pi interactions in metal carbonyl bonds. M-C pi bonds are also known as back bonding.

Chemistry: CUET Mock Test - 7 - Question 13

What is the geometry of pentacarbonyliron(0)?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 13

The coordination number of pentacarbonyliron(0) is 5 as CO is a unidentate ligand and hence its geometry id trigonal bipyramidal.

Chemistry: CUET Mock Test - 7 - Question 14

How is the M-C pi bond formed?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 14

The pi bond involves donation of electrons from filled metal d orbitals into empty antibonding pi orbitals of CO. This is also called a back bond.

Chemistry: CUET Mock Test - 7 - Question 15

What was the term proposed by Werner for the number of groups bound directly to the metal ion in a coordination complex?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 15

Primary valence of a metal ion is also known as its oxidation number. The secondary valence is equal to coordination number and it is fixed for a metal. Coordination polyhedra is the term for the spatial arrangements of the groups/ions around the metal.

Chemistry: CUET Mock Test - 7 - Question 16

If the secondary valence in CoCl3.4NH3 is six, the solution conductivity in silver nitrate corresponds to ________ electrolyte.

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 16

Werner observed that ‘x’ mol of AgCl was precipitated per mole of CoCl3.4NH3 with excess silver nitrate. Currently, there are seven groups attached to the cobalt atom. For the secondary valence to be six, one of the chloride (x = 1) has to be precipitated as AgCl, therefore 1:1 electrolyte.

Chemistry: CUET Mock Test - 7 - Question 17

Given that 1 mol of NiCl2.6H2O with excess AgNO3 precipitates 2 mols of AgCl, what is the secondary valence of Ni?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 17

After the reaction, it will form [Ni(H2O)6]2- and 2Cl in which the former is the coordination complex. There are six water molecules bound to Ni, which makes the secondary valence of Ni as 6.

Chemistry: CUET Mock Test - 7 - Question 18

What is the sum of the oxidation number of cobalt in [Co(H2O)(CN)(en)2]2+and [CoBr2(en)2]+?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 18

In [Co(H2O)(CN)(en)2]2+, the overall charge is +2 and 0, -1 and 0 on H2O, CN and en groups respectively. If ‘x’ is the oxidation number of Co, then (x + 0 – 1 + 0 = +2), which implies x=+3.
Similarly, in [CoBr2(en)2]+, the charge on Br is -1, so if ‘y’ is the oxidation number of Co, then (y – 2 + 0 = +1), which implies y = +3. Therefore, the sum of the oxidation numbers is 3 + 3 = 6.

Chemistry: CUET Mock Test - 7 - Question 19

What is the primary valence of iron in the coordination entity of compound Fe4[Fe(CN)6]3?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 19

This compound, also known as Prussian blue, dissociates into 4 Fe3+ and 3[Fe(CN)6]4- ions, of which the latter is the coordination entity having a charge of -4.
The Fe atom in question is the one inside the bracket. Since CN has a charge of -1 and there are 6 of them, the primary valence of Fe will be 6 – 4 = +2.

Chemistry: CUET Mock Test - 7 - Question 20

Which of the following is a complex salt?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 20

Potassium ferrocyanide, K4[Fe(CN6)], is a complex salt that does not dissociate into Fe2+ and CN ions when dissolved in water. The other three, i.e., potash alum, carnallite and Mohr’s salt are double salt that dissociate into simple ions completely when dissolved in water.

Chemistry: CUET Mock Test - 7 - Question 21

[Fe(CN)6]4- is an example of a _______

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 21

[Fe(CN)6]4- is the coordination complex ion of the coordination compound K4[Fe(CN6)], or potassium ferrocyanide, which is also a complex salt. Coordination complexes are also known as coordination entities.

Chemistry: CUET Mock Test - 7 - Question 22

If Pt in PtCl4.2HCl has a secondary valence of 6, how many mols of AgCl will 1 mol of the compound precipitate with excess AgNO3?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 22

Since the secondary valence is 6, the compound should have six groups linked to Pt atom. But it already has six groups linked to it and cannot lose any Cl atoms to form AgCl. Hence, no AgCl will be produced.

Chemistry: CUET Mock Test - 7 - Question 23

Werner postulated that octahedral, tetrahedral and square planar geometrical shapes are more common in coordination compounds of ________

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 23

Transition metals bond a bit differently from main group elements. They form coordinate covalent bonds and are often the central metal ion/atom of coordination complexes. Thus, octahedral, tetrahedral and square planar shapes are more common in transition metal central atoms.

Chemistry: CUET Mock Test - 7 - Question 24

Which is the counter ion in [Pd(NH3)4]2+2Cl?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 24

In coordination compounds, the ions outside the square brackets are called counter ions, and the species within the square bracket are the coordination entities.

Chemistry: CUET Mock Test - 7 - Question 25

What is the colour of the compound CoCl3.5NH3?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 25

The different compounds of cobalt(III) chloride with ammonia show distinct properties, most notably with respect to colour and conductivity measurements in solution.

Chemistry: CUET Mock Test - 7 - Question 26

What is the nature of the transition elements?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 26

Because they are all metals, the transition elements are often called the transition metals. As a group, they display typical metallic properties and are less reactive than the metals in group 1 and group 2 of the periodic table.

Chemistry: CUET Mock Test - 7 - Question 27

Which of the following element belongs to the third transition series of the periodic table?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 27

The third transition series or 5d series corresponding to the filling of 5d sublevel consists of the following 10 elements of the 6th period: La (Atomic No. = 57); Hf (Atomic No. = 72), Ta, W, Re, Os, Ir, Pt, Au and Hg (Atomic No. = 80).

Chemistry: CUET Mock Test - 7 - Question 28

Which of the following element belongs to the first transition series of the periodic table?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 28

The first transition series or 3d series corresponding to the filling of 3d sublevel consists of the following 10 elements of the 4th period: Sc (Atomic No. = 21), Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn (Atomic No. = 30).

Chemistry: CUET Mock Test - 7 - Question 29

How many series’ of transition elements are present in the periodic table?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 29

Unlike s or p block elements which are usually discussed as columns or groups, d-block elements are better discussed by classifying them into horizontal series. In the periodic table, there are four main transition series of elements corresponding to filling of 3d, 4d, 5d and 6d sublevels in the 4th, 5th, 6th and 7th periods.

Chemistry: CUET Mock Test - 7 - Question 30

Which of the following element is not a transition element?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 30

All transition elements are d-block elements, but all d-block elements are not transition elements. Zinc has the electronic configuration [Ar] 3d104s2, and the configuration of the Zn2+ ion is [Ar] 3d10. Thus, both the element and its only known stable ion have completely filled d-orbitals. Also, the metal does not exhibit any variable valency or multiple oxidation states in compound formation.

Chemistry: CUET Mock Test - 7 - Question 31

Which of the following element belongs to the second transition series of the periodic table?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 31

The second transition series or 4d series corresponding to the filling of 4d sublevel consists of the following 10 elements of the 5th period: Y (Atomic No. = 39), Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag and Cd (Atomic No. = 48).

Chemistry: CUET Mock Test - 7 - Question 32

What is the first element of the fourth transition series in the periodic table?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 32

The fourth transition series or 6d series corresponding to the filling of 6d sublevel starts with Actinium (Atomic No. = 89) followed by elements with atomic number 104 onwards. These elements lie in the seventh period of the periodic table.

Chemistry: CUET Mock Test - 7 - Question 33

Which characteristic of crude petroleum is a consequence of sulfur?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 33

Sourness of crude petroleum is a main characteristic caused by the presence of sulfur. Usually, crude petroleum is termed to be sweet if concentration of sulfur is less than 0.5%. If it is more, then it is termed as sour crude.

Chemistry: CUET Mock Test - 7 - Question 34

Which is a more vital source of elemental sulfur?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 34

Elemental sulfur is predominantly found near volcanic craters. This is because the sulfur dioxide released from the craters condenses to form liquid sulfur. This then solidifies to form elemental sulfur. In soil and oceans, sulfur is usually found in the form of pyrites.

Chemistry: CUET Mock Test - 7 - Question 35

When a flask containing sodium thiosulfate is placed over a paper marked with ‘X’ and HCl added to it, the ‘X’ seems to disappear when looked through the flask. Why?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 35

When sodium thiosulfate is treated with hydrochloric acid, sodium chloride is formed along with elemental sulfur. This yellow sulfur precipitates and causes the mark ‘X’ to fade away.

Chemistry: CUET Mock Test - 7 - Question 36

What is the name of the process of extracting sulfur on commercial scale?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 36

Frasch process is the industrial grade process of mining elemental sulfur from underground deposits. This is done by using pipelines and pumping superheated water and causing the molten sulfur to rise up which is then solidified. It was invented in 1894.

Chemistry: CUET Mock Test - 7 - Question 37

What is the common name of O2SCl2?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 37

The common name of SO2Cl2 is sulfuryl chloride. Usually, it is confused with thionyl chloride. It is an inorganic, colorless liquid with highly pungent odor. It can only be synthesized in labs and not found in nature.

Chemistry: CUET Mock Test - 7 - Question 38

What percentage of Earth’s mass is sulfur?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 38

Factually, 3% of Earth’s total mass is comprised of elemental sulfur. Carbon makes u about 0.032% of Earth’s crust and outer mantle. On the other hand, iron and magnesium account for 5% and 2% of Earth’s crust, respectively.

Chemistry: CUET Mock Test - 7 - Question 39

Who first recognized sulfur as an element?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 39

In ancient times, sulfur was thought to be fused with mercury and salt towards which alchemists thought it was a metal that could be transmuted. It was Antoine Lavoisier who first thought sulfur was an element. However, Humphry Davy believed it contained hydrogen.

Chemistry: CUET Mock Test - 7 - Question 40

What is the oxidation number of sulfur in dithionous acid?

Detailed Solution for Chemistry: CUET Mock Test - 7 - Question 40

Dithionous acid is formulated as H2S2O4. Since H can acquire ON of +1 and O of -2 each, then assuming ON of S to be X,
(2 x +1) + (2 x X) + (4 x -2) = 0
On solving, X = +3
The oxidation state/number of sulfur in dithionous acid is +3.

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