CBSE Questions for Class 11 Medical Chemistry Hydrogen Quiz 4 - MCQExams.com

Which is the accepted structure of $$H_{2}O_{2}$$ in gas phase?
  • both
  • none
In Celsius scale zero degree $$(0^oC)$$ is defined as the ice point, the temperature of mixture of ice and water in equilibrium at 1 atmosphere.
  • True
  • False
Last molecule of $$H_{2}O$$ is evolved from $$H_{2}O_{2}$$ by:
  • crystallisation
  • evaporation
  • distillation under reduced pressure
  • electrolysis
Density of water in the solid state is......... than the density of water in the liquid state.
  • higher
  • lower
  • same
  • none of these
Bond angle $$H-O-H$$ and $$H-O-O-H$$ in water and hydrogen peroxide respectively are :
  • $$104.5^\circ$$ in both
  • $$94.8^\circ$$ in both
  • $$104.5^\circ,\:94.8^\circ$$
  • $$94.8^\circ,\:104.5^\circ$$
The structure of $$H_{2}O_{2}$$ is:
  • planar
  • non-planar
  • spherical
  • linear
The hydride ion $$H^{-}$$ is stronger base than hydroxide ion $$OH^{-}$$. Which of the following reaction will occur if sodium hydride $$(NaH)$$ is dissolved in water?
  • $$H^{-}(aq.)+H_{2}O \rightarrow H_{3}O^{-}$$
  • $$H^{-}(aq.)+H_{2}O(l) \rightarrow OH^{-}+H_{2}$$
  • $$H^{-}+H_{2}O \rightarrow$$ No reaction
  • None of the above
The equilibrium molecular structure of $$H_{2}O_{2}$$ is:
  • planar 
  • linear
  • tetrahedral
  • non-planar, but not tetrahedral
  • cyclic


The production of dihydrogen gas via water gas shift reaction 

$$CO_(g) + H_2O_(g)$$ $$\overset\Delta\longrightarrow $$ $${CO_2}_(g) + {H_2}_(g)$$

The $$CO_2$$ gas is removed by scrubbing with solution of? 
  • sodium arsenite
  • Calcium oxide
  • Sodium phosphate
  • aluminium oxide
Water can be boiled in a paper cup.
  • True
  • False
When hydrogen burns in oxygen, water is formed. The type of chemical change involved is:
  • combustion
  • evaporation
  • displacement
  • decomposition
The species that contain peroxide ions is/are:
  • $$KO_2$$.
  • $$SrO_2$$.
  • $$BaO_2$$.
  • $$Na_2O_2$$.
Water is a mixture.
  • True
  • False
The dielectric constant for all molecules is greater than one.
  • True
  • False
Water in its pure form is a:
  • good conductor of heat
  • bad conductor of electricity
  • good conductor of electricity
  • none of these
The boiling point of water, on Fahrenheit scale is $$212^{\circ}F$$.
  • True
  • False
Saline water is useful for:
  • washing clothes
  • drinking
  • for agriculture
  • None of these
Pure water is a ________ conductor of electricity.
  • good
  • bad
  • semi
  • very good
When we heat water, we can find bubbles coming from it. This shows that:
  • water contains air
  • air contains water
  • hot water becomes bubbles
  • None of these
The volume strength of $$H_2O_2$$ solution isIt means:
  • at S.T.P. 10 g solution of $$H_2O_2$$ gives 10 mL of $$O_2$$
  • at S.T.P. 1 g equivalent of $$H_2O_2$$ gives 10 mL of $$O_2$$
  • at ST.P. 10 litre solution of $$H_2O_2$$ gives 10 mL of $$O_2$$
  • at S.T.P. 1 mL solution of $$H_2O_2$$ gives 10 mL of $$O_2$$
Ionic hydrides are usually:
  • good electrical conductors when solid
  • easily reduced
  • good reducing agents
  • liquid at room temperature
Which of the following is a true structure of $$H_{2}O_{2}$$ ?
In all its properties, hydrogen resembles:
  • alkali metals only
  • halogens only
  • both alkali metals and halogens
  • neither alkali metals nor halogens
Water boils and freezes exactly at 100ºC and 0ºC respectively; find the reason for it from the following
  • Water desolve anything however springly the dissolution will be
  • Water is a polar molecule
  • Boiling and freezing temperature of water is used to define temperature scales
  • none of these
Hydrogen is :
  • electropositive
  • electronegative
  • both electronpositive as well as electronegative
  • neither electropositive nor electronegative
Lead pipe for supplying the drinking water are:
  • not safe
  • quite safe
  • may be safe for some countries
  • nothing can be said about it
$$H_2O_2$$ is formed by which of the following compound?
  • $$Na_2O_2$$
  • $$NaOH$$
  • $$Na_2O$$
  • $$KO_2$$
The adsorption of hydrogen by metals is called:
  • Dehydrogenation
  • Hydrogenation
  • Occlusion
  • Adsorption
Water exists both as solid and liquid at:
  • $${100}^{o}C$$
  • $${50}^{o}C$$
  • $${2.5}^{o}C$$
  • $${0}^{o}C$$
  • $$-{10}^{o}C$$
Hydrogen loses its electron to form $$H^+$$. In this respect, it resembles:
  • halogens
  • alkali metals
  • transition element
  • alkaline earth metals
Temporary hardness of water is due to the presence of:
  • Magnesium bicarbonate
  • Calcium chloride
  • Magnesium sulphate
  • Calcium carbonate
The element having no neutron in the nucleus of its atom is:
  • hydrogen
  • nitrogen
  • helium
  • boron
Ionic hydrides are formed by:
  • transition metals
  • elements of very high electropositivity
  • elements of very low electropositivity
  • metalloids
$$H_2O_2$$ can be manufactured by the electrolysis of $$H_2SO_4$$ solution.
  • True
  • False
Heavy water is:
  • water with mercury compounds
  • water with chlorides and sulphates of Ca and Mg
  • water with bicarbonates of Ca and Mg
  • deuterium oxide
Hydrogen behaves as a metal:
  • at low temperature
  • at low pressure
  • at high temperature
  • at high pressure
Steam distillation is conducted to concentrate $$H_2O_2$$ solution.
  • True
  • False
The oxidation number of hydrogen varies from:
  • -1 to +1
  • 0 to +1
  • -1 to 0
  • 0 to +2
In crystalline $$H_2O_2$$, the dihedral angle is increased to 100.
  • True
  • False
Vacuum distillation is conducted to concentrate $$H_2O_2$$ solution.
  • True
  • False
Hydrogen loses its electron to form $$H^+$$, in this respect, it resembles:
  • halogens
  • alkali metals
  • transition element
  • alkaline earth metals
The characteristics of hydrogen resemble the elements of_____as well as_____groups.
  • IIA and VA
  • IIIA and VIA
  • IIA and VIA
  • IA and VIIA
Pure water is:
  • colourless and opaque
  • colourless and transparent
  • coloured and transparent
  • colourless, odourless and transparent
______ give lather even with hard water due to the formation of________
  • Soaps, soluble salts
  • Detergents, soluble salts
  • Detergents, insoluble salts
  • Soaps, insoluble precipitates
Pure water is a ________ conductor of electricity.
  • good
  • bad
  • either could be possible
  • none of the above
Specific heat of water is:
  • very low
  • medium
  • sometimes high and sometimes low
  • none of the above
The melting point of ice is:
  • $$0^oC$$
  • $$37^oC$$
  • $$4^oC$$
  • $$100^oC$$
The water pipes burst in winter because pipes contract at low temperature.
  • True
  • False
The water pipes burst in cold countries in winter due to anomalous expansion of water.
  • True
  • False
Distilled water is a good conductor of electricity.
  • True
  • False
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