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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 4901. |
If \[0.4\,gm\,\,NaOH\] is present in 1 litre solution, then its \[pH\] will be [CPMT 1985; BHU 1980] |
| A. | 2 |
| B. | 10 |
| C. | 11 |
| D. | 12 |
| Answer» E. | |
| 4902. |
The \[pH\] of a solution having \[[{{H}^{+}}]=10\times {{10}^{-4}}\,\,moles/litre\] will be [BHU 1981] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 4903. |
What will be the \[pH\] of a solution formed by mixing \[40\,\,ml\] of \[0.10\,\,M\,\,HCl\] with \[10\,\,ml\] of \[0.45\,\,M\,\,NaOH\] [Manipal MEE 1995] |
| A. | 12 |
| B. | 10 |
| C. | 8 |
| D. | 6 |
| Answer» B. 10 | |
| 4904. |
The \[pOH\]of beer is 10.0. The hydrogen ion concentration will be [MP PMT 1994] |
| A. | \[{{10}^{-2}}\] |
| B. | \[{{10}^{-10}}\] |
| C. | \[{{10}^{-8}}\] |
| D. | \[{{10}^{-4}}\] |
| Answer» E. | |
| 4905. |
What is the \[pH\]of \[Ba{{(OH)}_{2}}\]if normality is 10 [CPMT 1996] |
| A. | 4 |
| B. | 10 |
| C. | 7 |
| D. | 9 |
| Answer» C. 7 | |
| 4906. |
If 4.0 gm \[NaOH\] is present in 1 litre solution, then its \[pH\] will be [CPMT 1989] |
| A. | 6 |
| B. | 13 |
| C. | 18 |
| D. | 24 |
| Answer» C. 18 | |
| 4907. |
Which of the following is a buffer [MP PMT 1991; BHU 1995] |
| A. | \[NaOH+C{{H}_{3}}COONa\] |
| B. | \[NaOH+N{{a}_{2}}S{{O}_{4}}\] |
| C. | \[1\times {{10}^{-4}}\] |
| D. | \[N{{H}_{4}}OH+C{{H}_{3}}COON{{H}_{4}}\] |
| Answer» E. | |
| 4908. |
The \[pH\] of a solution obtained by mixing \[50\,\,ml\] of \[0.4\,\,N\,\,HCl\] and \[50\,\,ml\] of \[0.2\,\,N\,\,NaOH\]is [KCET 1996] |
| A. | \[-\log 2\] |
| B. | \[-\log 0.2\] |
| C. | 1.0 |
| D. | 2.0 |
| Answer» D. 2.0 | |
| 4909. |
The \[pH\] of the aqueous solution containing \[0.49\,\,gm\]of \[{{H}_{2}}S{{O}_{4}}\] in one litre is [EAMCET 1997] |
| A. | 2 |
| B. | 1 |
| C. | 1.7 |
| D. | 0.3 |
| Answer» B. 1 | |
| 4910. |
Which of the following solutions can act as buffer [JIPMER 1997] |
| A. | 0.1 molar aq. \[NaCl\] |
| B. | 0.1 molar aq. \[C{{H}_{3}}COOH+0.1\]molar \[NaOH\] |
| C. | 0.1 molar aq. ammonium acetate |
| D. | None of the above |
| Answer» D. None of the above | |
| 4911. |
How much sodium acetate should be added to a \[0.1\,\,m\] solution of \[C{{H}_{3}}COOH\] to give a solution of \[pH=5.5\,(p{{K}_{a}}\] of \[C{{H}_{3}}COOH=4.5)\] [KCET 1996] |
| A. | \[0.1\,\,m\] |
| B. | \[0.2\,\,m\] |
| C. | \[1.0\,\,m\] |
| D. | \[10.0\,\,m\] |
| Answer» D. \[10.0\,\,m\] | |
| 4912. |
When an acid or alkali is mixed with buffer solution, then \[pH\]of buffer solution [CPMT 1997] |
| A. | Not changes |
| B. | Changes slightly |
| C. | Increases |
| D. | Decreases |
| Answer» B. Changes slightly | |
| 4913. |
In a mixture of a weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The \[pH\] of the solution [KCET 1996] |
| A. | Decreases by one |
| B. | Increases by one-tenth |
| C. | Increases by one |
| D. | Increases ten-fold |
| Answer» B. Increases by one-tenth | |
| 4914. |
A physician wishes to prepare a buffer solution at \[pH=3.58\] that efficiently resists changes in \[pH\] yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use [CBSE PMT 1997] |
| A. | \[m-\]chlorobenzoic acid \[(p{{K}_{a}}=3.98)\] |
| B. | \[p-\]chlorocinnamic acid \[(p{{K}_{a}}=4.41)\] |
| C. | \[2,\,\,5-\]dihydroxy benzoic acid \[(p{{K}_{a}}=2.97)\] |
| D. | Acetoacetic acid \[(p{{K}_{a}}=3.58)\] |
| Answer» D. Acetoacetic acid \[(p{{K}_{a}}=3.58)\] | |
| 4915. |
The \[pH\]value of decinormal solution of \[N{{H}_{4}}OH\] which is 20% ionised, is [CBSE PMT 1998] |
| A. | 13.30 |
| B. | 14.70 |
| C. | 12.30 |
| D. | 12.95 |
| Answer» D. 12.95 | |
| 4916. |
The \[pH\] of a buffer solution containing \[25\,ml\]of \[1\,M\,C{{H}_{3}}COONa\] and \[25\,\,ml\] of \[1\,\,M\,\,C{{H}_{3}}COOH\] will be appreciably affected by \[5\,\,ml\] of [CPMT 1987] |
| A. | \[1\,\,M\,\,C{{H}_{3}}COOH\] |
| B. | \[5\,\,M\,\,C{{H}_{3}}COOH\] |
| C. | \[5\,\,M\,\,HCl\] |
| D. | \[1\,\,M\,\,N{{H}_{4}}OH\] |
| Answer» C. \[5\,\,M\,\,HCl\] | |
| 4917. |
\[pH\] of a solution is 5. Its hydroxyl ion concentration is [JIPMER 1999] |
| A. | 5 |
| B. | 10 |
| C. | \[{{10}^{-5}}\] |
| D. | \[{{10}^{-9}}\] |
| Answer» E. | |
| 4918. |
Hydrogen is not obtained when zinc reacts with [J & K 2005] |
| A. | Cold water |
| B. | Hot \[NaOH\] solution |
| C. | Conc. sulphuric acid |
| D. | dilute \[HCl\] |
| Answer» D. dilute \[HCl\] | |
| 4919. |
Which element forms maximum compound in chemistry [Pb. CET 2004] |
| A. | \[O\] |
| B. | \[H\] |
| C. | \[Si\] |
| D. | \[C\] |
| Answer» C. \[Si\] | |
| 4920. |
Which of the following gas is insoluble in water [Pb. CET 2003] |
| A. | \[S{{O}_{2}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[{{H}_{2}}\] |
| D. | \[C{{O}_{2}}\] |
| Answer» D. \[C{{O}_{2}}\] | |
| 4921. |
Which of the following will not displace hydrogen [Pb. PMT 1999] |
| A. | Ba |
| B. | Pb |
| C. | Hg |
| D. | Sn |
| Answer» D. Sn | |
| 4922. |
Which of the following is correct for hydrogen [AFMC 1997; BHU 1997] |
| A. | It can form bonds in +1 as well as -1 oxidation state |
| B. | It is always collected at cathode |
| C. | It has a very high ionization potential |
| D. | It has same electronegativity as halogens |
| Answer» B. It is always collected at cathode | |
| 4923. |
Hydrogen accepts an electron to form inert gas configuration. In this it resembles [Pb. PMT 1997] |
| A. | Halogen |
| B. | Alkali metals |
| C. | Chalcogens |
| D. | Alkaline earth metals |
| Answer» B. Alkali metals | |
| 4924. |
The hydride ion \[{{H}^{-}}\] is a stronger base than its hydroxide ion \[O{{H}^{-}}\]. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in water [CBSE PMT 1997] |
| A. | \[{{H}^{-}}(aq)+{{H}_{2}}O\to {{H}_{3}}{{O}^{-}}(aq)\] |
| B. | \[{{H}^{-}}(aq)+{{H}_{2}}O(l)\to O{{H}^{-}}(aq)+{{H}_{2}}(g)\] |
| C. | \[{{H}^{-}}(aq)+{{H}_{2}}O(l)\to \text{No reaction}\] |
| D. | None of these |
| Answer» C. \[{{H}^{-}}(aq)+{{H}_{2}}O(l)\to \text{No reaction}\] | |
| 4925. |
Which one of the following substances is used in the laboratory for a fast drying of neutral gases [CBSE PMT 1992] |
| A. | Phosphorus pentoxide |
| B. | Active charcoal |
| C. | Anhydrous calcium chloride |
| D. | \[N{{a}_{3}}P{{O}_{4}}\] |
| Answer» D. \[N{{a}_{3}}P{{O}_{4}}\] | |
| 4926. |
When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volumes of hydrogen evolved is [CPMT 1991] |
| A. | 0.0423611111111111 |
| B. | 0.0430555555555556 |
| C. | 0.0840277777777778 |
| D. | 0.377777777777778 |
| Answer» B. 0.0430555555555556 | |
| 4927. |
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\] is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [Pb. CET 1990; AIIMS 1999] |
| A. | \[CaC{{O}_{3}}\] |
| B. | CaO |
| C. | \[Ca{{(OH)}_{2}}\] |
| D. | \[Ca{{(HC{{O}_{3}})}_{2}}\] |
| Answer» D. \[Ca{{(HC{{O}_{3}})}_{2}}\] | |
| 4928. |
Hydrogen directly combines with [Roorkee Entrance 1990] |
| A. | Au |
| B. | Cu |
| C. | Ni |
| D. | Ca |
| Answer» E. | |
| 4929. |
Which of the following reaction produces hydrogen [AIIMS 2002] |
| A. | \[Mg+{{H}_{2}}O\] |
| B. | \[Ba{{O}_{2}}+HCl\] |
| C. | \[{{H}_{2}}{{S}_{4}}{{O}_{8}}+{{H}_{2}}O\] |
| D. | \[N{{a}_{2}}{{O}_{2}}+2HCl\] |
| Answer» B. \[Ba{{O}_{2}}+HCl\] | |
| 4930. |
Limiting compositions of f-block hydrides are |
| A. | \[M{{H}_{2}}\] and \[M{{H}_{3}}\] |
| B. | \[M{{H}_{3}}\] and \[M{{H}_{5}}\] |
| C. | \[M{{H}_{2}}\] and \[M{{H}_{8}}\] |
| D. | \[M{{H}_{2}}\] and \[M{{H}_{6}}\] |
| Answer» B. \[M{{H}_{3}}\] and \[M{{H}_{5}}\] | |
| 4931. |
Group 2 hydrides with significant covalent character is/are |
| A. | \[Be{{H}_{2}}\] |
| B. | \[Mg{{H}_{2}}\] |
| C. | Both a and b |
| D. | None of these |
| Answer» D. None of these | |
| 4932. |
Systematic name of \[{{H}_{2}}O\](oxide of hydrogen) is |
| A. | Water |
| B. | Hydrogen oxide |
| C. | Oxidane |
| D. | None of these |
| Answer» D. None of these | |
| 4933. |
When \[NaB{{H}_{4}}\] is dissolved in water |
| A. | It decomposes with the evolution of \[{{H}_{2}}\] |
| B. | \[N{{a}^{+}}\] and \[BH_{4}^{-}\] are formed which are stable |
| C. | \[BH_{4}^{-}\] ions formed initially decompose to produce \[O{{H}^{-}}\] ions, which prevent further decomposition |
| D. | NaH and \[{{B}_{2}}{{H}_{6}}\] are produced |
| Answer» D. NaH and \[{{B}_{2}}{{H}_{6}}\] are produced | |
| 4934. |
Ionic hydrides are usually |
| A. | Good electrically conductors when solid |
| B. | Easily reduced |
| C. | Good reducing agents |
| D. | Liquid at room temperature |
| Answer» D. Liquid at room temperature | |
| 4935. |
Alkali metal hydrides react with water to give |
| A. | Acidic solution |
| B. | Basic solution |
| C. | Neutral solution |
| D. | Hydride ion |
| Answer» C. Neutral solution | |
| 4936. |
\[LiAl{{H}_{4}}\] is obtained by reacting an excess of ?. With an ethereal solution of \[AlC{{l}_{3}}\] |
| A. | LiCl |
| B. | LiH |
| C. | Li |
| D. | LiOH |
| Answer» C. Li | |
| 4937. |
Triatomic hydrogen is called |
| A. | Deuterium |
| B. | Hyzone |
| C. | Ortho form |
| D. | Hydronium ion |
| Answer» C. Ortho form | |
| 4938. |
The ratio \[{{C}_{p}}/{{C}_{v}}\] for \[{{H}_{2}}\] is |
| A. | 1.4 |
| B. | 1.67 |
| C. | 1.33 |
| D. | None of these |
| Answer» B. 1.67 | |
| 4939. |
The name hydrogen was given by |
| A. | Cavendish |
| B. | Lavoisier |
| C. | Urey |
| D. | None of these |
| Answer» C. Urey | |
| 4940. |
Among the following, identify the compound which cannot act as both oxidising and reducing agents [AMU 2002] |
| A. | \[{{H}_{2}}{{O}_{2}}\] |
| B. | \[{{H}_{2}}\] |
| C. | \[S{{O}_{2}}\] |
| D. | \[C{{l}_{2}}\] |
| Answer» C. \[S{{O}_{2}}\] | |
| 4941. |
The conversion of atomic hydrogen into ordinary hydrogen is |
| A. | Exothermic change |
| B. | Endothermic change |
| C. | Nuclear change |
| D. | Photochemical change |
| Answer» B. Endothermic change | |
| 4942. |
The gas used in the hydrogenation of vegetable oils in the presence of nickel as catalyst is |
| A. | Methane |
| B. | Ethane |
| C. | Ozone |
| D. | Hydrogen |
| Answer» E. | |
| 4943. |
Tritium undergoes radioactive decay giving |
| A. | a-particles |
| B. | b-particles |
| C. | Neutrons |
| D. | g-rays |
| Answer» C. Neutrons | |
| 4944. |
Deuterium differs from hydrogen in |
| A. | Chemical properties |
| B. | Physical properties |
| C. | Both physical and chemical properties |
| D. | Radioactive properties |
| Answer» C. Both physical and chemical properties | |
| 4945. |
In Bosch?s process which gas is utilised for the production of hydrogen gas |
| A. | Producer gas |
| B. | Water gas |
| C. | Coal gas |
| D. | None of these |
| Answer» C. Coal gas | |
| 4946. |
Pure hydrogen is obtained by carrying electrolysis of |
| A. | Water containing \[{{H}_{2}}S{{O}_{4}}\] |
| B. | Water containing NaOH |
| C. | \[Ba{{(OH)}_{2}}\] solution |
| D. | KOH solution |
| Answer» D. KOH solution | |
| 4947. |
In which of the compounds does hydrogen have an oxidation state of -1 |
| A. | \[C{{H}_{4}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | HCl |
| D. | \[Ca{{H}_{2}}\] |
| Answer» E. | |
| 4948. |
On reaction with Mg, very dilute nitric acid produces [CPMT 2003] |
| A. | \[N{{H}_{3}}\] |
| B. | Nitrous oxide |
| C. | Nitric oxide |
| D. | Hydrogen |
| Answer» E. | |
| 4949. |
Electrolysis of fused sodium hydride liberate hydrogen at the |
| A. | Anode |
| B. | Cathode |
| C. | Cathode and anode both |
| D. | None of these |
| Answer» B. Cathode | |
| 4950. |
Hydrogen readily combines with metals and thus shows its |
| A. | Electropositive character |
| B. | Electronegative character |
| C. | Both a and b |
| D. | None of these |
| Answer» C. Both a and b | |