JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

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All years 2024 2023 2022 2021

What is the purpose of adding gypsum to cement?

The correct order of hydration enthalpies is

\( (A) \ \mathrm{K}^+ \) \( (B) \ \mathrm{Rb}^+ \) \( (C) \ \mathrm{Mg}^{2+} \) \( (D) \ \mathrm{Cs}^+ \) \( (E) \ \mathrm{Ca}^{2+} \)

A s-block element \( \text{(M)} \) reacts with oxygen to form an oxide of the formula \( \text{MO}_2 \). The oxide is pale yellow in colour and paramagnetic. The element \( \text{(M)} \) is:

Portland cement contains 'X' to enhance the setting time. What is 'X'?

What are the products formed in sequence when excess of \( \mathrm{CO_2} \) is passed in slaked lime?

The setting time of Cement is increased by adding.

Given below are two statements:
Statement I : None of the alkaline earth metal hydroxides dissolve in alkali.
Statement II : Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements, choose the most appropriate answer from the options given below :

Reaction of \( \mathrm{BeCl_2} \) with \( \mathrm{LiAlH_4} \) gives:
(A) \( \mathrm{AlCl_3} \) (B) \( \mathrm{BeH_2} \) (C) \( \mathrm{LiH} \) (D) \( \mathrm{LiCl} \) (E) \( \mathrm{BeAlH_4} \)
Choose the correct answer from options given below:

Match List-I with List-II:

List-I	List-II
A. K	I. Thermonuclear reactions
B. KCl	II. Fertilizer
C. KOH	III. Sodium potassium pump
D. Li	IV. Absorbent of \( \mathrm{CO_2} \)

Choose the correct answer from the options given below:

10.

Statement I: An alloy of lithium and magnesium is used to make aircraft plates.
Statement II: The magnesium ions are important for cell-membrane integrity.
In the light the above statements, choose the correct answer from the options given below:

11.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: The alkali metals and their salts impart characteristic colour to reducing flame.

Reason R: Alkali metals can be detected using flame tests.

In the light of the above statements, choose the most appropriate answer from the options given below:

12.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion (A): \( \mathrm{BeCl_2} \) and \( \mathrm{MgCl_2} \) produce characteristic flame
Reason (R): The excitation energy is high in \( \mathrm{BeCl_2} \) and \( \mathrm{MgCl_2} \)
In the light of the above statements, choose the correct answer from the options given below:

13.

On heating, \( \mathrm{LiNO_3} \) gives how many compounds among the following? _______.
\( \mathrm{Li_2O} \), \( \mathrm{N_2} \), \( \mathrm{LiNO_2} \), \( \mathrm{NO_2} \), \( \mathrm{O_2} \)

14.

Given below are two Statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: During the boiling of water having temporary hardness, \( \mathrm{Mg(HCO_3)_2} \) is converted to \( \mathrm{MgCO_3} \).
Reason R: The solubility product of \( \mathrm{Mg(OH)_2} \) is greater than that of \( \mathrm{MgCO_3} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

15.

Lime reacts exothermally with water to give ‘A’ which has low solubility in water. Aqueous solution of ‘A’ is often used for the test of \( \mathrm{CO_2} \), a test in which insoluble B is formed. If B is further reacted with \( \mathrm{CO_2} \) then soluble compound is formed. ‘A’ is:

16.

The correct order of density is:

17.

In the given reaction cycle

\( X \), \( Y \) and \( Z \) respectively are:

18.

The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater than \( 400 \, \mathrm{kJ \, mol^{-1}} \) and forming stable super oxide is ______.

19.

Match List I and List II

Choose the correct answer from the options given below :

20.

Reaction of \( \mathrm{BeO} \) with ammonia and hydrogen fluoride gives A which on thermal decomposition gives \( \mathrm{BeF_2} \) and \( \mathrm{NH_4F} \). What is 'A'?

21.

s-Block element which cannot be qualitatively confirmed by the flame test is:

22.

The correct order of melting point is:

23.

\( \mathrm{Mg(NO_3)_2 \, XH_2O} \) and \( \mathrm{Ba(NO_3)_2 \, YH_2O} \) represent formula of the crystalline forms of nitrate salts. Sum of \( X \) and \( Y \) is ________.

24.

The correct order of conductivity of ions in water is:

25.

The number of water molecules is gypsum, dead burnt plaster and plaster of Paris, respectively are:

26.

Given below are two statements:
Statement I: The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.
Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions
In the light of the above statements, choose the correct answer from the options given below:

27.

\( \mathrm{Be(OH)_2} \) reacts with \( \mathrm{Sr(OH)_2} \) to yield an ionic salt. Choose the incorrect option related to this reaction from the following:

28.

Match List -I with List II

Choose the correct answer from the options given below:

29.

The alkaline earth metal sulphate(s) which are readily soluble in water is/are:
A. \( \mathrm{BeSO}_4 \) B. \( \mathrm{MgSO}_4 \) C. \( \mathrm{CaSO}_4 \) D. \( \mathrm{SrSO}_4 \) E. \( \mathrm{BaSO}_4 \)
Choose the correct answer from the options given below:

30.

Choose the correct statement(s).
A. Beryllium oxide is purely acidic in nature.
B. Beryllium carbonate is kept in the atmosphere of \( CO_2 \)
C. Beryllium sulphate is readily soluble in water.
D. Beryllium shows anomalous behavior.
Choose the correct answer from the options given below:

31.

Number of water molecules in washing soda and soda ash respectively are:

32.

The oxide that gives \( \mathrm{H_2O_2} \) most readily on treatment with \( \mathrm{H_2O} \) is:

33.

Choose the correct order of density of the alkali metals:

34.

For a good quality element, the ratio of lime to the total of the oxides of \( \mathrm{Si} \), \( \mathrm{Al} \) and \( \mathrm{Fe} \) should be as close as to:

35.

The correct set from the following in which both pairs are in correct order of melting point is:

36.

Which of the following reaction is correct?

37.

Identify the correct statements about alkali metals.
(A) The order of standard reduction potential \( (\mathrm{M^{+}|M}) \) for alkali metal ions is \( \mathrm{Na > Rb > Li} \).
(B) \( \mathrm{CsI} \) is highly soluble in water.
(C) Lithium carbonate is highly stable to heat.
(D) Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
(E) All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below:

38.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Barium carbonate is insoluble in water and is highly stable.
Reason (R): The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below:

39.

Match List-I with List-II.

List-I Alkali Metal	List-II Emission Wavelength in nm
A. Li	(I) \( 589.2 \)
B. Na	(II) \( 455.5 \)
C. Rb	(III) \( 670.8 \)
D. Cs	(IV) \( 780.0 \)

Choose the correct answer from the options given below:

40.

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

41.

One of the by-products formed during the recovery of \( \mathrm{NH_3} \) from Solvay process is :

42.

In the following reactions, the total number of oxygen atoms in \( X \) and \( Y \) is _________
\( \mathrm{Na_2O} + \mathrm{H_2O} \rightarrow 2X \)
\( \mathrm{Cl_2O_7} + \mathrm{H_2O} \rightarrow 2Y \)

43.

Match List I with List II:

List – I (Elements)	List – II (Properties)
(a) Li	(i) Poor water solubility of \( \mathrm{I}^- \) salt
(b) Na	(ii) Most abundant element in cell fluid
(c) K	(iii) Bicarbonate salt used in fire extinguisher
(d) Cs	(iv) Carbonate salt decomposes easily on heating

Choose the correct answer from the options given below:

44.

Match Column I with Column II:

Choose the correct answer from the options given below :

45.

Ion having highest hydration enthalpy among the given alkaline earth metal ions is:

46.

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Sodium is about \( 30 \) times as abundant as potassium in the oceans.
Reason R : Potassium is bigger in size than sodium.
In the light of the above statements, choose the correct answer from the option given below

47.

Given below are two statements:
Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water.
Statement II: Synthetic resin method results in the formation of soluble sodium salts.
In the light of the above statements, choose the most appropriate answer from the options given below:

48.

Lithium nitrate and sodium nitrate, when heated separately, respectively, give:

49.

Choose the correct statement from the following :

50.

Identify the incorrect pair from the following:

51.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Lithium salts are hydrated.
Reason (R): Lithium has higher polarising power than other alkali metal group members.
In the light of the above statements, choose the most appropriate answer from the options given below:

52.

Given below are two statements.
Statement-I: Lithium and Magnesium do not form superoxide.
Statement-II : The ionic radius of \( \mathrm{Li^+} \) is larger than ionic radius of \( \mathrm{Mg^{2+}} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

53.

Which one of the following statements is correct for electrolysis of brine solution?

54.

Structures of \( \mathrm{BeCl}_2 \) in solid state, vapour phase and at very high temperature respectively are:

55.

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are :

56.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Beryllium has less negative value of reduction potential compared to the other alkaline earth metals.
Reason R: Beryllium has large hydration energy due to small size of \( \mathrm{Be^{2+}} \) but relatively large value of atomization enthalpy.
In the light of above statements, choose the most appropriate answer from the options given below:

57.

Alkali metal from the following with least melting point is :

58.

Match List I with List II.

Choose the correct answer from the options given below:

59.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): An aqueous solution of KOH when used for volumetric analysis, its concentration should be checked before the use.
Reason (R): On adding, KOH solution absorbs atmospheric \( \mathrm{CO_2} \).
In the light of the above statements, choose the correct answer from the option given below:

60.

Which one among the following metals is the weakest reducing agent?

61.

The density of alkali metals is in the order:

62.

Better method for preparation of \( \mathrm{BeF}_2 \), among the following is :

63.

Amongst baking soda, caustic soda and washing soda, carbonate anion is present in:

64.

The element playing significant role in neuromuscular function and interneuronal transmission is:

65.

Identify the correct order of standard enthalpy of formation of sodium halides.

66.

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): Gypsum is used for making fireproof wall boards.
Reason (R): Gypsum is unstable at high temperatures.
In the light of the above statement, choose the correct from the options given below:

67.

Number of paramagnetic oxides among the following given oxides is: \( \mathrm{Li_2O} \), \( \mathrm{CaO} \), \( \mathrm{Na_2O_2} \), \( \mathrm{KO_2} \), \( \mathrm{MgO} \) and \( \mathrm{K_2O} \)

68.

Match List I with List II.