New Exam Prep
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New Exam Prep
English 25 leveled MCQs Free
Shared by a Veda learner · Generated with Veda AI
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1
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Sample questions with model answers
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4 marks Medium answer
How many water molecules are associated with the formula unit of Epsom salt?
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7
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4 marks Medium answer
Washing soda on standing in air effloresces. How many water molecules are lost per formula unit of washing soda?
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10
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4 marks Medium answer
Calculate the magnitude of heat of solution of NaCl from the following data: Hydration energy of $Na^{\oplus} = -389kJ mol^{-1}$, Hydration energy of $Cl^{\ominus} = -382kJ mol^{-1}$, Lattice energy of $NaCl = +776kJ mol^{-1}$.
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5
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4 marks Medium answer
The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are X, Y and Z. Then X+Y+2Z = ________.
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15
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4 marks Medium answer
How many of the following compounds are formed upon heating of $LiNO_3(s)$: $Li_2O, N_2, O_2, LiNO_2, NO_2$?
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3
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1 marks Short answer
Which of the following alkali metals gives hydrated salt commonly?
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Na
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1 marks Short answer
Sodium hydroxide is produced on a large scale:
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by the electrolysis of an aqueous solution of NaCl using a mercury cathode cell.
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1 marks Short answer
If NaOH is added to an aqueous solution of $Zn^{2+}$ ions a white precipitate appears and on adding excess of NaOH, the precipitate dissolves. In this solution zinc exists in ____
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cationic part
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1 marks Short answer
Which ion regulates the flow of water across the cell membranes?
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$Na^+$
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1 marks Short answer
Lithium has highest ionisation energy but is strongest reducing agent in aqueous solution because of its
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Greater heat of hydration
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1 marks Short answer
The gaseous products in Castner – Kellner process are
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$Cl_2$ & $H_2$
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1 marks Short answer
Alkali metals can be extracted from their salts by
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Electrolysis of fused halides
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1 marks Short answer
$NaOH(aq) + NH_4Cl(aq) \xrightarrow{\text{boil}} A + NaCl(aq) + H_2O(l)$, what is 'A' in the reaction?
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$NH_3$
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1 marks Short answer
Which is the best reducing agent among the following in aqueous solution?
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Li
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1 marks Short answer
Which of the following atom is diamagnetic?
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$Mg^{2+}$
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1 marks Short answer
The setting time of cement is increased by adding
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Gypsum
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1 marks Short answer
In the given cycle $CaCl_2 + Na_2CO_3 \rightarrow X + Y$. An arrow from $CaCl_2$ points to Z. X, Y and Z respectively are
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$CaCO_3, NaCl$ and $KCl$
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1 marks Short answer
Ion having highest hydration enthalpy among the given IIA metal ions is:
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$Be^{2+}$
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1 marks Short answer
Correct order of melting point of given halides is:
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$NaF > NaCl > NaBr$
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1 marks Short answer
In the following sequence of reaction, identify the compounds (A), (B), (C) and (D): $NH_3(g) + CO_2(g) + H_2O(l) \rightarrow (A) \xrightarrow{excess CO_2} (B) \xrightarrow{NaCl(s)} (C) \xrightarrow{heating} (D)$
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$NH_4OH, (NH_4)_2CO_3, Na_2CO_3, NaHCO_3$
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1 marks Short answer
Which hydroxide has the maximum basic strength?
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KOH
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1 marks Short answer
Which of the following substance can be used for drying neutral or basic gases?
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CaO
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1 marks Short answer
Among the given statements, the incorrect one is
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Be usually has more than four water of crystallisation associated with it.
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1 marks Short answer
The ionic mobility of $Li^{\oplus}$ is less than that of the $Na^{\oplus}$ ion in aqueous solution because
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$Li^{\oplus}$ ion has the high ionisation enthalpy
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1 marks Short answer
The correct order of stability of hydrides of alkali metals is
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$LiH > NaH > KH > RbH$
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