Reactivity with Dihydrogen (Group 1)

Q. Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :

1. Beryllium chloride
2. Calcium chloride
3. Strontium chloride
4. Magnesium chloride

Q.

Write the order of thermal stability of the hydrides of Group 16 elements.

Q. The correct decreasing order of stability of the following sulphates is:
$SrS{O}_4\left(I\right),MgS{O}_4\left(II\right),CaS{O}_4\left(III\right),BeS{O}_4\left(IV\right)$

1. $I>III>II>IV$
2. $II<IV<III<I$
3. $II>I>III>IV$
4. $II>III>IV>I$

Q.

Which is more stable peroxide or superoxide?

Q. Which of the following hydrides conducts electricity?

1. $Si{H}_4$
2. $B_2{H}_6$
3. $C{H}_4$
4. $KH$

Q. Explain the cause of low reactivity of lithium inspite of being strong reducing agent in acqueous solution.

Q.

Comment on each of the following observations:

(a) The mobilities of the alkali metal ions in aqueous solution are Li⁺ < Na⁺ < K⁺ < Rb⁺ < Cs⁺

(b) Lithium is the only alkali metal to form a nitride directly.

(c) (where M = Ca, Sr or Ba) is nearly constant.

Q.

Match the following

A) Thermal stability order of hydrides 1) Na > K >Rb> Li > Cs

B) Ionic nature of hydrides 2) Li > Na > K >Rb> Cs

C) I.P₂ values order 3) CsH>RbH> KH >NaH>LiH

D) Abundance decreasing order 4) LiH>NaH> KH >RbH>CsH

1. A-4, B-3, C-2, D-1

2. A-1, B-2, C-3, D-4

3. A-4, B-1, C-2, D-3

4. A-1, B-4, C-3, D-2

Q. Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	$Fe$ in solid state	(i)	Electrolytic conductor
(B)	$NaCl$ in molten state	(ii)	$p-$type semiconductor
(C)	$C{O}_2$ in solid state	(iii)	Electronic conductor
(D)	$Si$ doped with aluminium	(iv)	Non-polar insulator

1. (A)$\to$ (iv), (B) $\to$ (ii), (C) $\to$ (i), (D) $\to$ (iii)
2. (A) $\to$ (ii), (B) $\to$ (iii), (C) $\to$ (i), (D)$\to$ (iv)
3. (A) $\to$ (iii), (B) $\to$ (i), (C) $\to$ (iv), (D) $\to$ (ii)
4. (A) $\to$ (i), (B) $\to$ (iv), (C) $\to$ (iii), (D) $\to$ (ii)

Q. Assertion :The crystalline salts of alkaline earth metals contain more water of crystallization than the corresponding alkali metal salts. Reason: The size of alkaline earth metal ions is lower than the size of alkali metal ions. The lower the size of the cation, the higher is the hydration energy. So the salts of alkaline earth metals have more water molecules of crystallization than those of alkali metals.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q.

$NaH$ reacts with water to give:

1. Alkaline solution

2. NH₃ gas

3. Neutral solution

4. Acidic solution

Q. The thermal stability order for group 14 tetrahalides is :

1. ${CX}_4>{SiX}_4>{GeX}_4>Sn{X}_4$
2. ${SnX}_4>{GeX}_4>{SiX}_4>{CX}_4$
3. ${SiX}_4>{CX}_4>{GeX}_4>Sn{X}_4$
4. None of these

Q.

Complete the following equation:${\mathrm{ZnCO}}_3+{\mathrm{HNO}}_3\to$

Q. Conc. $H_{2}S{O}_4$, anhydrous $Ca{Cl}_2$ or $P_4{O}_{10}$ cannot be used as drying agent for ammonia, why?

Q. Molecular formula of sodium hydride is ____.

1. $\text{N}{\text{a}}_{\text{2}}{\text{H}}_2$
2. $\text{Na}{\text{H}}_{\text{3}}$
3. $\text{N}{\text{a}}_{\text{2}}\text{H}$
4. $\text{Na}\text{H}$

Q.

In terms of thermal stability of the alkali metal hydrides, which one is the most stable?

1. NaH

2. RbH

3. LiH

4. KH

Q. Saline hydrides are known to react with water violently producing fire. Can $C{O}_2$ a well known fire extinguisher, be used in this case? Explain.

Q. Molten sodium chloride conducts electricity due to presence of:

1. free electrons
2. free ions
3. free molecules
4. free atoms

Q. The stable superoxide is formed by the element.

1. $Li$
2. $Na$
3. $K$
4. $Ca$

Q. In which of the following complexes central metal ion do not follows EAN rule:-

1. $Fe(CO{)}_5$
2. $[CO{F}_6{]}^{3-}$
3. $[Hg{I}_4{]}^{2-}$
4. $\left[Cr\right(H_{2}O{)}_6{]}^{+3}$

Q. "$K{O}_2$ is binary oxide of alkali metal."
Answer whether the above statement is true or false.
If true enter 1, else enter 0

Q.

Look at the following reaction:
$LiH+Al{H}_3⟶LiAl{H}_4$

Here $Al{H}_3$ and $LiH$ act as:

1. Lewis acid and Lewis base

2. Lewis base and Lewis acid

3. Bronsted base and Bronsted acid

4. None of these

Q. When $F_2$ reacts with hot and concentrated alkali, then which of the following will be obtained?
(i) $O{F}_2$
(ii) $O_2$
(iii) $H_{2}O$
(iv) $NaF$

1. (i), (iii) and (iv)
2. (ii) and (iii)
3. (ii), (iii) and (iv)
4. All of the above

Q. Sodium hydride $\left(NaH\right)$ when dissolved in water produces:

1. acidic solution
2. neutral solution
3. cannot be predicted
4. basic solution

Q. $\left[Mn{\left(CO\right)}_5\right]$ can attain more stability by :

1. Oxidation of itself
2. Dimerization
3. Reduction of itself
4. Both ( B ) and ( C )

Q. When dissolved in water, which of the following produces an ionic solution?

1. $O_2$
2. $C{H}_4$
3. $C_{12}{H}_{22}{O}_{11}$
4. $CaC{l}_2$

Q. What state are most ionic compounds at room temperature?

1. Solid
2. Liquid
3. Gas
4. Plasma
   

Q.

In terms of thermal stability of the alkali metal hydrides, which one is the most stable?

1. NaH

2. RbH

3. KH

4. LiH

Q. Assertion :Molten potassium chloride is a good electrical conductor. Reason: the melting process frees the ions in potassium chloride from their fixed positions in the crystal lattice.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Some ionic compound names have roman numerals in them. What do those numerals mean?

1. They indicate the charge on the cation
2. They indicate how many anions are present
3. They indicate the charge on the ionic compound
4. They are arbitrary