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What is the purpose of adding gypsum to cement?

The correct order of hydration enthalpies is

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

The setting time of Cement is increased by adding.

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:

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:

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:

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

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:

In the given reaction cycle

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

10.

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 ______.

11.

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'?

12.

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

13.

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

14.

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:

15.

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:

16.

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

17.

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:

18.

Which of the following reaction is correct?

19.

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:

20.

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

21.

Match Column I with Column II:

Choose the correct answer from the options given below :

22.

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

23.

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

24.

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:

25.

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:

26.

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

27.

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

28.

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:

29.

Alkali metal from the following with least melting point is :

30.

Match List I with List II.

Choose the correct answer from the options given below:

31.

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:

32.

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

33.

The density of alkali metals is in the order:

34.

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

35.

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

36.

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

37.

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:

38.

Match List I with List II.

Choose the correct answer from the options given below:

39.

The number of s-electrons present in an ion with \( 55 \) protons in its unipositive state is:

40.

Chlorides of which metal are soluble in organic solvents:

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