Which of the following are examples of ellipsoid joint ?
(A) The wrist joint (B) The metacarpophalangeal joints (C) The metatarsophalangeal joints (D) All of these. The Correct Answer is... View Article
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Vaccines are made up of _______.
(A) Live pathogen (B) Dead pathogen (C) Weakened pathogen (D) All of these The Correct Answer is (D) All of... View Article
Which of the following pigments shows yellow-green colour in chromatogram?
(A) Carotenoid (B) Xanthophyll (C) Chlorophyll ‘a’ (D) Chlorophyll ‘b’ The Correct Answer is (B) Xanthophyll. Solution: Xanthophylls pigments show... View Article
The vapour pressure of water at room temperature is lowered by 5% by dissolving a solute in it. What is the approximate molality of the solution
A. 2 B. 1 C. 4 D. 3 Solution: (D) P∘ − PS / PS = n / N =... View Article
If equal masses of both He(g) and SO2(g) are taken in a 5 l vessel at a total pressure of 10 atm then the partial pressure of He(g) in the mixture will be
Solution: (2.3) Let x gm of He and SO2 be present. Given, Ptotal = 10 atm Number of moles of... View Article
What would be the molality of 20% (mass/mass) aqueous solution of NaOH?
Solution: (6.25 mol/kg) First, we need to find the molar mass of NaOH. Basically, the compound contains one sodium atom,... View Article
In a polar molecule, the ionic charge is 4.8 × 10−10 e.s.u. If the inter-ionic distance is 1Å unit, then the dipole moment is
A. 41.8 D B. 4.18 D C. 4.8 D D. 0.48 D Solution: (C) Given, Ionic charge = 4.8 ×... View Article
An unknown compound D is first oxidised to an aldehyde and then to acetic acid by a dilute solution of K2Cr2O7 and H2SO4. The unknown compound ‘D’ is
A. CH3CHO B. CH2CH3OH C. CH3CH2OH D. CH3CH2CH3 Solution: (A) The compound is CH3CHO. \(\begin{array}{l}CH_{3}CHO + [O] \xrightarrow[]{K_{2}Cr_{2}O_{7}+H_{2}SO_{4}}CH_{3}COOH\end{array} \)
80 g of water at 10 oC is mixed with steam at 100 oC. The amount of water present after it acquires a temperature of 40 oC is
Solution: (84 g) Water at 10 °C and weight = 80g, Steam Temperature = 😯 °C Specific heat of water sw =... View Article
A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 leads to an anhydrous white powder Z. X and Z, respectively, are
A. Baking soda and dead burnt plaster. B. Washing soda and soda ash C. Washing soda and dead burnt plaster.... View Article
n-factor for the following reaction is
FeS2 → Fe2O3 + SO2 A. 8 B. 9 C. 10 D. 11 Solution: (D) Total n factor = 10... View Article
Which of the following sample(s) must have an average molar mass greater than that of a mixture of N2 and CO2?
A. Pure O3 B. Pure Ne C. Mixture of SO2 and SO3 D. Mixture of CH4 and SO3 Solution: (D)... View Article
Arrange the following hydrides of Group-16 elements in the increasing order of their thermal stability: H2O, H2S, H2Se, H2Te
H2O, H2S, H2Se, H2Te Solution: Considering the condition that stability of hydrides of group-16 decreases down the group we can... View Article
Which reaction does not represent auto redox or disproportionation?
A. Cl2 + OH– → Cl– + ClO3– + H2O B. 2H2O2 → 2H2O + O2 C. 2Cu+ → Cu2+... View Article
What is the amount of work done when 0.5 moles of methane, CH4(g), is subjected to combustion at 300 K?
A. −2494J B. −4988J C. +4988J D. +2494J Solution: (D) Let us balance the chemical equation for combustion reaction; CH4(g) + 2O2(g)... View Article
The rate equation for the reaction A + B → P is rate = k[A]½ [B]2. What is the order of reaction
Solution: (2.5) For A + B → P r = k[A]½ [B]2 The order of the reaction = 2 +... View Article
When Mn(OH)2 is made by adding an alkali to a solution containing Mn2+ ions, the precipitate quickly darkens, and eventually goes black. What might be the chemical giving black colour
A. Mn2O3 B. MnO2 C. Mn2O5 D. None of these Solution: (B) Mn(OH)2 is oxidized by oxygen in the air... View Article
Among the following compounds, the number of compounds that do not produce acidic or basic solutions when dissolved in water is
NaCl, BeCl2, BaCl2, Li2O, MgO, CaH2, CaSO4. Solution: (3) The compounds are; Magnesium Oxide (MgO) will react with water to... View Article
For the cell reaction: 4Br− + O2 + 4H+ ⇌ 2Br2 + 2H2O; E∘ = 0.18V. The value of (log KC) at 298 K is [2.303 RT / F = 0.06]
A. 12 B. 6 C. 18 D. 3 Solution: (A) From the question; E0 = 0.18V 2.303RT/F = 0.06 Cell... View Article
The ratio of (E2 − E1) to (E4 − E3) for the hydrogen atom is approximately equal to
A. 10 B. 15 C. 17 D. 12 Solution: (B) In hydrogen atom formula for energy is E = −13.6... View Article
